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Yang S, Ma Y, Gao J, Wang X, Weng F, Zhang Y, Xu Y. Exploring the response and prediction of phytoplankton to environmental factors in eutrophic marine areas using interpretable machine learning methods. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 951:175600. [PMID: 39159687 DOI: 10.1016/j.scitotenv.2024.175600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2024] [Revised: 08/10/2024] [Accepted: 08/15/2024] [Indexed: 08/21/2024]
Abstract
Coastal marine areas are frequently affected by human activities and face ecological and environmental threats, such as algal blooms and climate change. The community structure of phytoplankton-primary producers in marine ecosystems-is highly sensitive to environmental factors, such as temperature, salinity, and nutrients. However, traditional methods for exploring the relationship between phytoplankton communities and environmental factors in eutrophic marine areas are limited by various factors. Therefore, this study employed interpretable machine learning models, integrating high-dimensional data analysis and complex system modeling, to quantitatively and thoroughly analyze the dynamic relationship between phytoplankton communities and environmental variables in high-frequency samples collected over 53 weeks from eutrophic marine areas. The cell abundance of phytoplankton exhibited a distinct "two-peak pattern" variation. Interpretable machine learning model analysis revealed the dynamic contributions of different environmental factors during changes in the phytoplankton community structure. The results showed that temperature was a key environmental factor that affected phytoplankton growth during peak periods. In addition, the contribution of salinity increased during the second peak in phytoplankton abundance, highlighting its central role in the ecological dynamics of this phase. During green tide outbreaks, particularly in Area 01, the contributions of factors such as temperature and salinity increased, whereas those of phosphates and silicates decreased, indicating that green tide outbreaks substantially altered the nutritional dynamics of the ecosystem. Furthermore, different phytoplankton species, such as Skeletonema costatum, Thalassiosira spp., and Nitzschia spp., exhibit varying responses to environmental factors. Hence, the predictions made using random forest and generalized additive models for phytoplankton cell abundance in two marine areas revealed complex nonlinear relationships between environmental factors, such as temperature, salinity, and phytoplankton abundance.
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Affiliation(s)
- Shimin Yang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Yuanting Ma
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Jie Gao
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Xiajie Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Futian Weng
- National Institute for Data Science in Health and Medicine, Xiamen University, Xiamen 361005, China; Data Mining Research Center, Xiamen University, Xiamen 361005, China
| | - Yan Zhang
- MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Yan Xu
- MOE Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
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2
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Chen Y, Shen C, Zhao H, Pan G. The impact of marine heatwaves on surface phytoplankton chlorophyll-a in the South China Sea. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 949:175099. [PMID: 39079642 DOI: 10.1016/j.scitotenv.2024.175099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 07/26/2024] [Accepted: 07/26/2024] [Indexed: 08/05/2024]
Abstract
According to previous studies, marine heatwaves (MHWs) significantly suppress the phytoplankton chlorophyll-a concentration (Chl a) in tropical oceans. However, pre-MHW Chl a has rarely been considered as a reference value. In this study, the Chl a for the periods preceding and during MHWs events was used to explore the impact of MHWs on Chl a from 1998 to 2022 in the South China Sea (SCS). The Chl a response to MHWs in different regions was further discussed based on the Chl a variation characteristics. The results showed that the Chl a response to MHWs exhibited regional variability. Interestingly, there was a large proportion of positive Chl a anomalies (∼0.55) in the estuary and offshore regions during MHWs; however, Chl a anomalies were mostly negative in the upwelling regions. These different response patterns are related to background conditions, including nutrient concentrations, wind-driven dynamics, and light availability. In upwelling regions, negative Chl a anomalies were primarily due to the weakening of wind speeds, Ekman pumping velocities, and upwelling intensities. In estuarine regions, positive Chl a anomalies were caused by enhanced light availability, whereas in offshore regions, there were attributed to the increased atmospheric wet deposition. These results have improved our understanding of the impact of MHWs on marine ecosystems.
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Affiliation(s)
- Yingjun Chen
- College of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang 524088, China
| | - Chunyan Shen
- College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China
| | - Hui Zhao
- College of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang 524088, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China; Cooperative Research Center for Nearshore Marine Environmental Change, Guangdong Ocean University, Zhanjiang 524088, China; Research Center for Coastal Environmental Protection and Ecological Resilience, Guangdong Ocean University, Zhanjiang 524088, China.
| | - Gang Pan
- College of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang 524088, China; Cooperative Research Center for Nearshore Marine Environmental Change, Guangdong Ocean University, Zhanjiang 524088, China; School of Humanities, York St John University, York, United Kingdom
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3
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Sunil S, Bhagwat G, Vincent SGT, Palanisami T. Microplastics and climate change: the global impacts of a tiny driver. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 946:174160. [PMID: 38909818 DOI: 10.1016/j.scitotenv.2024.174160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 06/13/2024] [Accepted: 06/18/2024] [Indexed: 06/25/2024]
Abstract
Microplastic pollution and climate change, the two seemingly distinct phenomena of global concern, are interconnected through various pathways. The connecting links between the two include the biological carbon pumps in the oceans, the sea ice, the plastisphere involved in biogeochemical cycling and the direct emissions of greenhouse gases from microplastics. On one hand, the presence of microplastics in the water column disrupts the balance of the natural carbon sequestration by affecting the key players in the pumping of carbon, such as the phytoplankton and zooplankton. On the other hand, the effect of microplastics on the sea ice in Polar Regions is two-way, as the ice caps are transformed into sinks and sources of microplastics and at the same time, the microplastics can enhance the melting of ice by reducing the albedo. Microplastics may have more potential than larger plastic fragments to release greenhouse gases (GHGs). Microbe-mediated emission of GHGs from soils is also now altered by the microplastics present in the soil. Plastisphere, the emerging microbiome in aquatic environments, can also contribute to climate change as it hosts complex networks of microbes, many of which are involved in greenhouse gas production. To combat a global stressor like climate change, it needs to be addressed with a holistic approach and this begins with tracing the various stressors like microplastic pollution that can aggravate the impacts of climate change.
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Affiliation(s)
- Syama Sunil
- Department of Environmental Sciences, University of Kerala, Thiruvananthapuram, Kerala 695034, India
| | - Geetika Bhagwat
- Global Innovative Centre for Advanced Nanomaterials (GICAN), School of Engineering, Science and Environment, The University of Newcastle, Callaghan, NSW 2308, Australia
| | | | - Thava Palanisami
- Global Innovative Centre for Advanced Nanomaterials (GICAN), School of Engineering, Science and Environment, The University of Newcastle, Callaghan, NSW 2308, Australia
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4
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Yang S, Zu J, Feng Y, Ding L, Zhang Q, Zhang H. A functional-group-based perspective on the response of marine phytoplankton to mesoscale eddies. MARINE POLLUTION BULLETIN 2024; 207:116864. [PMID: 39180965 DOI: 10.1016/j.marpolbul.2024.116864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2024] [Revised: 08/14/2024] [Accepted: 08/14/2024] [Indexed: 08/27/2024]
Abstract
This study analyzed the response of marine phytoplankton to environmental changes induced by mesoscale warm eddies through the lens of functional groups, highlighting the complex interactions within the ecosystem. It was found that warm eddies significantly affected phytoplankton distribution, with cell abundance in the center being only 75.60 cells/L, compared to 1095.00 cells/L in the periphery. Vertical transport within warm eddies altered light conditions, affecting photophilic diatoms more, while increased temperatures favored the growth of warm-water dinoflagellates. This study also emphasized that ocean currents were significant factors, showing correlations with various functional groups and playing a key role in material transport and phytoplankton distribution. Additionally, the distinct responses of different functional groups to temperature and salinity underscored their unique adaptations to environmental changes. In periods without warm eddies, phytoplankton primarily congregated in shallower water layers.
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Affiliation(s)
- Shimin Yang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Jiying Zu
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Youfei Feng
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Lichi Ding
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Qinchao Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Huiling Zhang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
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5
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Zhu J, Li S, Chen W, Xu X, Wang X, Wang X, Han J, Jouhet J, Amato A, Maréchal E, Hu H, Allen AE, Gong Y, Jiang H. Delta-5 elongase knockout reduces docosahexaenoic acid and lipid synthesis and increases heat sensitivity in a diatom. PLANT PHYSIOLOGY 2024; 196:1356-1373. [PMID: 38796833 DOI: 10.1093/plphys/kiae297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 04/19/2024] [Accepted: 04/28/2024] [Indexed: 05/29/2024]
Abstract
Recent global marine lipidomic analysis reveals a strong relationship between ocean temperature and phytoplanktonic abundance of omega-3 long-chain polyunsaturated fatty acids, especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are essential for human nutrition and primarily sourced from phytoplankton in marine food webs. In phytoplanktonic organisms, EPA may play a major role in regulating the phase transition temperature of membranes, while the function of DHA remains unexplored. In the oleaginous diatom Phaeodactylum tricornutum, DHA is distributed mainly on extraplastidial phospholipids, which is very different from the EPA enriched in thylakoid lipids. Here, clustered regularly interspaced short palindromic repeats/CRISPR-associated protein 9-mediated knockout of delta-5 elongase (ptELO5a), which encodes a delta-5 elongase (ELO5) catalyzing the elongation of EPA to synthesize DHA, led to a substantial interruption of DHA synthesis in P. tricornutum. The ptELO5a mutants showed some alterations in transcriptome and glycerolipidomes, including membrane lipids and triacylglycerols under normal temperature (22 °C), and were more sensitive to elevated temperature (28 °C) than wild type. We conclude that PtELO5a-mediated synthesis of small amounts of DHA has indispensable functions in regulating membrane lipids, indirectly contributing to storage lipid accumulation, and maintaining thermomorphogenesis in P. tricornutum. This study also highlights the significance of DHA synthesis and lipid composition for environmental adaptation of P. tricornutum.
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Affiliation(s)
- Junkai Zhu
- School of Marine Sciences, Ningbo University, Ningbo 315211, China
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
| | - Shuangqing Li
- School of Marine Sciences, Ningbo University, Ningbo 315211, China
- Life and Ecology Center, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China
| | - Weizhong Chen
- School of Marine Sciences, Ningbo University, Ningbo 315211, China
| | - Xinde Xu
- Department of Human Nutrition, Zhejiang Medicine Co. Ltd., Xinchang 312500, China
- Department of Human Nutrition, Zhejiang Keming Biopharmaceuticals Co. Ltd., Xinchang 312500, China
| | - Xiaoping Wang
- Department of Human Nutrition, Zhejiang Medicine Co. Ltd., Xinchang 312500, China
- Department of Human Nutrition, Zhejiang Keming Biopharmaceuticals Co. Ltd., Xinchang 312500, China
| | - Xinwei Wang
- School of Marine Sciences, Ningbo University, Ningbo 315211, China
| | - Jichang Han
- College of Food Science and Engineering, Ningbo University, Ningbo 315211, China
| | - Juliette Jouhet
- Laboratoire de Physiologie Cellulaire et Végétale, Centre National de la Recherche Scientifique, Commissariat à l'Energie Atomique et aux Energies Alternatives, INRAE, Université Grenoble Alpes, Unité mixte de recherche 5168, IRIG, CEA Grenoble, F-38041 Grenoble, France
| | - Alberto Amato
- Laboratoire de Physiologie Cellulaire et Végétale, Centre National de la Recherche Scientifique, Commissariat à l'Energie Atomique et aux Energies Alternatives, INRAE, Université Grenoble Alpes, Unité mixte de recherche 5168, IRIG, CEA Grenoble, F-38041 Grenoble, France
| | - Eric Maréchal
- Laboratoire de Physiologie Cellulaire et Végétale, Centre National de la Recherche Scientifique, Commissariat à l'Energie Atomique et aux Energies Alternatives, INRAE, Université Grenoble Alpes, Unité mixte de recherche 5168, IRIG, CEA Grenoble, F-38041 Grenoble, France
| | - Hanhua Hu
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Andrew E Allen
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093, USA
- Department of Environment and Sustainability, J. Craig Venter Institute, La Jolla, CA 92037, USA
| | - Yangmin Gong
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
| | - Haibo Jiang
- School of Marine Sciences, Ningbo University, Ningbo 315211, China
- Life and Ecology Center, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China
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6
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Liu S, Han J, Yao L, Li H, Xin G, Ho SH, Huang X. Integrated multilevel investigation of photosynthesis revealed the algal response distinction to differentially charged nanoplastics. JOURNAL OF HAZARDOUS MATERIALS 2024; 475:134815. [PMID: 38885582 DOI: 10.1016/j.jhazmat.2024.134815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 05/20/2024] [Accepted: 06/03/2024] [Indexed: 06/20/2024]
Abstract
Nanoplastics (NPs), especially those with different charges, as one of emerging contaminants pose a threat to aquatic ecosystems. Although differentially charged NPs could induce distinct biological effects, mechanistic understanding of the critical physiological processes of aquatic organisms from an integrated multilevel perspective on aquatic organisms is still uncertain. Herein, multi-effects of differentially charged nanosized polystyrene (nPS) including neutral nPS, nPS-COOH, and nPS-NH2 on the photosynthesis-related physiological processes of algae were explored at the population, individual, subcellular, protein, and transcriptional levels. Results demonstrated that both nPS and nPS-COOH exhibited hormesis to algal photosynthesis but nPS-NH2 triggered severe inhibition. As for nPS-NH2, the integrity of algal subcellular structure, chlorophyll biosynthesis, and expression of photosynthesis-related proteins and genes were interfered. Intracellular NPs' content in nPS treatment was 25.64 % higher than in nPS-COOH treatment, and the content of chloroplasts in PS and nPS-COOH treatment were 3.09 % and 4.56 % higher than control, respectively. Furthermore, at the molecular levels, more photosynthesis-related proteins and genes were regulated under nPS-COOH exposure than those exposed to nPS. Light-harvesting complex II could be recognized as an underlying explanation for different effects between nPS and nPS-COOH. This study first provides a novel approach to assess the ecological risks of NPs at an integrated multilevel.
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Affiliation(s)
- Saibo Liu
- State Key Lab of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, PR China
| | - Jingheng Han
- State Key Lab of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, PR China
| | - Linjie Yao
- State Key Lab of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, PR China
| | - Huijun Li
- State Key Lab of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, PR China
| | - Guorong Xin
- State Key Lab of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, PR China.
| | - Shih-Hsin Ho
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Huanghe Road 73, Harbin 150090, PR China
| | - Xiaochen Huang
- State Key Lab of Biocontrol, Guangdong Provincial Key Laboratory of Plant Resources, School of Agriculture and Biotechnology, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, PR China.
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7
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Ferreira A, Mendes CRB, Costa RR, Brotas V, Tavano VM, Guerreiro CV, Secchi ER, Brito AC. Climate change is associated with higher phytoplankton biomass and longer blooms in the West Antarctic Peninsula. Nat Commun 2024; 15:6536. [PMID: 39095339 PMCID: PMC11297178 DOI: 10.1038/s41467-024-50381-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 07/09/2024] [Indexed: 08/04/2024] Open
Abstract
The Antarctic Peninsula (West Antarctica) marine ecosystem has undergone substantial changes due to climate-induced shifts in atmospheric and oceanic temperatures since the 1950s. Using 25 years of satellite data (1998-2022), this study presents evidence that phytoplankton biomass and bloom phenology in the West Antarctic Peninsula are significantly changing as a response to anthropogenic climate change. Enhanced phytoplankton biomass was observed along the West Antarctic Peninsula, particularly in the early austral autumn, resulting in longer blooms. Long-term sea ice decline was identified as the main driver enabling phytoplankton growth in early spring and autumn, in parallel with a recent intensification of the Southern Annular Mode (2010-ongoing), which was observed to influence regional variability. Our findings contribute to the understanding of the complex interplay between environmental changes and phytoplankton responses in this climatically key region of the Southern Ocean and raise important questions regarding the far-reaching consequences that these ecological changes may have on global carbon sequestration and Antarctic food webs in the future.
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Grants
- PQ 312569/2021-1 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- PQ 310597/2018-8 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- PQ 312569/2021-1 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- 442628/2018-8 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- 442637/2018-7 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- 442628/2018-8 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- 442637/2018-7 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- PQ 312569/2021-1 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- PQ 310597/2018-8 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- 442637/2018-7 Ministry of Science, Technology and Innovation | Conselho Nacional de Desenvolvimento Científico e Tecnológico (National Council for Scientific and Technological Development)
- N 810139 EC | Horizon 2020 Framework Programme (EU Framework Programme for Research and Innovation H2020)
- N 810139 EC | Horizon 2020 Framework Programme (EU Framework Programme for Research and Innovation H2020)
- FCT - Fundação para a Ciência e Tecnologia (Portugal): - SFRH/BD/144586/2019 - CEECIND/00095/2017 - CEECIND/00752/2018 - UIDP/04292/2020 - UIDB/04292/2020 - LA/P/0069/2020 - PROPOLAR 2018/2019, 2019/2020, 2020/2021 CAPES: - Call no. 41/2017
- FCT - Fundação para a Ciência e Tecnologia (Portugal): - UIDP/04292/2020 - UIDB/04292/2020 - LA/P/0069/2020 - PROPOLAR 2018/2019, 2019/2020, 2020/2021
- FCT - Fundação para a Ciência e Tecnologia (Portugal): - CEECIND/00752/2018/C - UIDP/04292/2020 - UIDB/04292/2020 - LA/P/0069/2020 - PROPOLAR 2018/2019, 2019/2020, 2020/2021
- FCT - Fundação para a Ciência e Tecnologia (Portugal): - CEECIND/00095/2017 - UIDP/04292/2020 - UIDB/04292/2020 - LA/P/0069/2020 - PROPOLAR 2018/2019, 2019/2020, 2020/2021
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Affiliation(s)
- Afonso Ferreira
- MARE - Marine and Environmental Sciences Centre/ARNET-Aquatic Research Network, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 016, 1749-016, Lisboa, Portugal.
- Laboratório de Fitoplâncton e Microorganismos Marinhos, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil.
| | - Carlos R B Mendes
- Laboratório de Fitoplâncton e Microorganismos Marinhos, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil
- Laboratório de Estudos dos Oceanos e Clima, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil
- Programa de Pós-graduação em Oceanografia Biológica, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil
| | - Raul R Costa
- Laboratório de Fitoplâncton e Microorganismos Marinhos, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil
- Laboratório de Estudos dos Oceanos e Clima, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil
- Programa de Pós-graduação em Oceanografia Biológica, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil
| | - Vanda Brotas
- MARE - Marine and Environmental Sciences Centre/ARNET-Aquatic Research Network, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 016, 1749-016, Lisboa, Portugal
- Departamento de Biologia Vegetal, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 016, 1749-016, Lisboa, Portugal
- Plymouth Marine Laboratory, Prospect Place, Plymouth, PL1 3DH, United Kingdom
| | - Virginia M Tavano
- Laboratório de Fitoplâncton e Microorganismos Marinhos, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil
| | - Catarina V Guerreiro
- MARE - Marine and Environmental Sciences Centre/ARNET-Aquatic Research Network, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 016, 1749-016, Lisboa, Portugal
- Departamento de Biologia Vegetal, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 016, 1749-016, Lisboa, Portugal
| | - Eduardo R Secchi
- Programa de Pós-graduação em Oceanografia Biológica, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil
- Laboratório de Ecologia e Conservação da Megafauna Marinha, Universidade Federal do Rio Grande-FURG, Av. Itália, Km 8, 96203-900, Rio Grande-RS, Brasil
| | - Ana C Brito
- MARE - Marine and Environmental Sciences Centre/ARNET-Aquatic Research Network, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 016, 1749-016, Lisboa, Portugal
- Departamento de Biologia Vegetal, Faculdade de Ciências, Universidade de Lisboa, Campo Grande 016, 1749-016, Lisboa, Portugal
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8
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da Silveira Bueno C, Paytan A, de Souza CD, Franco TT. Global warming and coastal protected areas: A study on phytoplankton abundance and sea surface temperature in different regions of the Brazilian South Atlantic Coastal Ocean. Ecol Evol 2024; 14:e11724. [PMID: 39114175 PMCID: PMC11303980 DOI: 10.1002/ece3.11724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 06/20/2024] [Accepted: 06/26/2024] [Indexed: 08/10/2024] Open
Abstract
In this study, we examined the relationship between sea surface temperature (SST) and phytoplankton abundance in coastal regions of the Brazilian South Atlantic: São Paulo, Paraná, and Santa Catarina, and the Protection Area of Southern right whales (Eubalaena australis) in Santa Catarina (APA), a conservation zone established along 130 km of coastline. Using SST and chlorophyll-a (Chl-a) data from 2002 to 2023, we found significant differences in SST between the regions, with São Paulo having the highest SST, followed by Paraná and Santa Catarina. All locations showed a consistent increase in SST over the years, with North Santa Catarina, APA and São Paulo experiencing the lowest rate of increase. Correlation analyses between SST and Chl-a revealed a stronger inverse relationship in North Santa Catarina and APA, indicating an increased response of Chl-a to SST variations in this region. The presence of protected area appears to play an essential role in reducing the negative impacts of increasing SST. Specifically, while there is a wealth of research on the consequences of global warming on diverse coastal and oceanic areas, heterogeneity among different settings persists and the causes for this necessitating attention. Our findings have implications for both localized scientific approaches and broader climate policies, emphasizing the importance of considering coastal ecosystem resilience to climate change in future conservation and adaptation strategies.
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Affiliation(s)
- Carolina da Silveira Bueno
- Earth and Planetary Sciences, Ocean Sciences Departament, Institute of Marine SciencesUniversity of CaliforniaSanta CruzCaliforniaUnited States
- Interdisciplinary Center of Energy PlanningUniversidade Estadual de CampinasCampinasBrazil
- Department of Climate and EnvironmentFederal Institute of Education, Science and Technology of Santa CatarinaFlorianopolisBrazil
| | - Adina Paytan
- Earth and Planetary Sciences, Ocean Sciences Departament, Institute of Marine SciencesUniversity of CaliforniaSanta CruzCaliforniaUnited States
| | | | - Telma Teixeira Franco
- Earth and Planetary Sciences, Ocean Sciences Departament, Institute of Marine SciencesUniversity of CaliforniaSanta CruzCaliforniaUnited States
- Faculty of Chemical Engineering & Interdisciplinary Center of Energy PlanningUniversidade Estadual de CampinasCampinasBrazil
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Lin T, Feng Y, Miao W, Wang S, Bao Z, Shao Z, Zhang D, Wang X, Jiang H, Zhang H. Elevated temperature alters bacterial community from mutualism to antagonism with Skeletonema costatum: insights into the role of a novel species, Tamlana sp. MS1. mSphere 2024; 9:e0019824. [PMID: 38940599 PMCID: PMC11288006 DOI: 10.1128/msphere.00198-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Accepted: 05/15/2024] [Indexed: 06/29/2024] Open
Abstract
Skeletonema costatum, a cosmopolitan diatom primarily inhabiting coastal ecosystems, exhibits a typically close yet variable relationship with heterotrophic bacteria. The increasing temperature of surface seawater is expected to substantially affect the viability and ecological dynamics of S. costatum, potentially altering its relationship with bacteria. However, it remains unclear to what extent the elevated temperature could change these relationships. Here, the relationship between axenic S. costatum and natural seawater bacteria underwent a dramatic shift from mutualism to antagonism as the co-culture temperature increased from 20°C to 25°C. The co-occurrence network indicated significantly increased complexity of interaction between S. costatum and bacteria community after temperature elevation, especially with Flavobacteriaceae, implying their potential role in eliminating S. costatum under higher temperatures. Additionally, a Flavobacteriaceae isolate, namely MS1 identified as Tamlana genus, was isolated from the co-culture system at 25°C. MS1 had a remarkable ability to eliminate S. costatum, with the mortality rate at 25°C steadily rising from 30.2% at 48 h to 92.4% at 120 h. However, it promoted algal growth to some extent at 20°C. These results demonstrated that increased temperature promotes MS1 shifts from mutualism to antagonism with S. costatum. According to the comparative genomics analysis, changes in the lifestyle of MS1 were attributed to the increased gliding motility and attachment of MS1 under elevated temperature, enabling it to exert an algicidal effect through direct contact with alga. This investigation provided an advanced understanding of interactions between phytoplankton and bacteria in future warming oceanic ecosystems. IMPORTANCE Ocean warming profoundly influences the growth and metabolism of phytoplankton and bacteria, thereby significantly reshaping their interactions. Previous studies have shown that warming can change bacterial lifestyle from mutualism to antagonism with phytoplankton, but the underlying mechanism remains unclear. In this study, we found that high temperature promotes Tamlana sp. MS1 adhesion to Skeletonema costatum, leading to algal lysis through direct contact, demonstrating a transition in lifestyle from mutualism to antagonism with increasing temperature. Furthermore, the gliding motility of MS1 appears to be pivotal in mediating the transition of its lifestyle. These findings not only advance our understanding of the phytoplankton-bacteria relationship under ocean warming but also offer valuable insights for predicting the impact of warming on phytoplankton carbon sequestration.
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Affiliation(s)
- Tenghui Lin
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, China
- School of Marine Sciences, Ningbo University, Ningbo, China
| | - Yumeng Feng
- School of Marine Sciences, Ningbo University, Ningbo, China
| | - Wenfei Miao
- School of Marine Sciences, Ningbo University, Ningbo, China
| | - Shuqi Wang
- School of Marine Sciences, Ningbo University, Ningbo, China
| | - Zhen Bao
- School of Marine Sciences, Ningbo University, Ningbo, China
| | - Zeyuan Shao
- School of Marine Sciences, Ningbo University, Ningbo, China
| | - Demin Zhang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, China
- School of Marine Sciences, Ningbo University, Ningbo, China
- Key Laboratory of Applied Marine Biotechnology of Department of Education, Ningbo University, Ningbo, China
| | - Xinwei Wang
- School of Marine Sciences, Ningbo University, Ningbo, China
- Key Laboratory of Applied Marine Biotechnology of Department of Education, Ningbo University, Ningbo, China
| | - Haibo Jiang
- School of Marine Sciences, Ningbo University, Ningbo, China
- Key Laboratory of Applied Marine Biotechnology of Department of Education, Ningbo University, Ningbo, China
| | - Huajun Zhang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, China
- School of Marine Sciences, Ningbo University, Ningbo, China
- Key Laboratory of Applied Marine Biotechnology of Department of Education, Ningbo University, Ningbo, China
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10
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Sun X, Brewin RJW, Hacker C, Viljoen JJ, Li M. Generating open-source 3D phytoplankton models by integrating photogrammetry with scanning electron microscopy. Front Microbiol 2024; 15:1429179. [PMID: 39081890 PMCID: PMC11287660 DOI: 10.3389/fmicb.2024.1429179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Accepted: 06/25/2024] [Indexed: 08/02/2024] Open
Abstract
The community structure and ecological function of marine ecosystems are critically dependent on phytoplankton. However, our understanding of phytoplankton is limited due to the lack of detailed information on their morphology. To address this gap, we developed a framework that combines scanning electron microscopy (SEM) with photogrammetry to create realistic 3D (three-dimensional) models of phytoplankton. The workflow of this framework is demonstrated using two marine algal species, one dinoflagellate Prorocentrum micans and one diatom Halamphora sp. The resulting 3D models are made openly available and allow users to interact with phytoplankton and their complex structures virtually (digitally) and tangibly (3D printing). They also allow for surface area and biovolume calculations of phytoplankton, as well as the exploration of their light scattering properties, which are both important for ecosystem modeling. Additionally, by presenting these models to the public, it bridges the gap between scientific inquiry and education, promoting broader awareness on the importance of phytoplankton.
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Affiliation(s)
- Xuerong Sun
- Centre for Geography and Environmental Science, Department of Earth and Environmental Science, Faculty of Environment, Science and Economy, University of Exeter, Cornwall, United Kingdom
| | - Robert J. W. Brewin
- Centre for Geography and Environmental Science, Department of Earth and Environmental Science, Faculty of Environment, Science and Economy, University of Exeter, Cornwall, United Kingdom
| | | | - Johannes J. Viljoen
- Centre for Geography and Environmental Science, Department of Earth and Environmental Science, Faculty of Environment, Science and Economy, University of Exeter, Cornwall, United Kingdom
| | - Mengyu Li
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China
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11
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Ping B, Meng Y, Su F, Xue C, Li Z. Retrieval of subsurface dissolved oxygen from surface oceanic parameters based on machine learning. MARINE ENVIRONMENTAL RESEARCH 2024; 199:106578. [PMID: 38838431 DOI: 10.1016/j.marenvres.2024.106578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 05/18/2024] [Accepted: 06/02/2024] [Indexed: 06/07/2024]
Abstract
Oceanic dissolved oxygen (DO) is crucial for oceanic material cycles and marine biological activities. However, obtaining subsurface DO values directly from satellite observations is limited due to the restricted observed depth. Therefore, it is essential to develop a connection between surface oceanic parameters and subsurface DO values. Machine learning (ML) methods can effectively grasp the complex relationship between input attributes and target variables, making them a valuable approach for estimating subsurface DO values based on surface oceanic parameters. In this study, the potential of ML methods for subsurface DO retrieval is analyzed. Among the selected ML methods, namely support vector regression (SVR), random forest (RF) regression, and extreme gradient boosting (XGBoosting) regression, the RF method generally demonstrates superior performance. As the depth increases, the accuracy of DO estimates tends to initially decrease, then gradually improve, with the poorest performance occurring at the depth of 600 dbar. The range of determination coefficients (R2) and root mean square error (RMSE) values based on the test dataset at different depths lies between 0.53 and 47.59 μmol/kg to 0.99 and 4.01 μmol/kg. In addition, compared to sea surface salinity (SSS) and sea surface chlorophyll-a (SCHL), sea surface temperature (SST) plays a more significant role in DO retrieval. Finally, compared to the pelagic interactions scheme for carbon and ecosystem studies (PISCES) model, the RF method achieves higher retrieval accuracies at depths above 700 dbar. In the deep ocean, the primary differences in DO values obtained from the RF method and the PISCES model-based method are noticeable in the vicinity of the equatorial region.
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Affiliation(s)
- Bo Ping
- School of Earth System Science, Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China.
| | - Yunshan Meng
- National Marine Data and Information Service, Tianjin, 300171, China.
| | - Fenzhen Su
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Cunjin Xue
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China.
| | - Zhi Li
- China Center for Resources Satellite Data and Application, Beijing, 100094, China.
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12
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Kim S, Lee D, Kim M, Jang HK, Park S, Kim Y, Kim J, Park JW, Joo H, Lee SH. Seasonal patterns and bloom dynamics of phytoplankton based on satellite-derived chlorophyll-a in the eastern yellow sea. MARINE ENVIRONMENTAL RESEARCH 2024; 199:106605. [PMID: 38878346 DOI: 10.1016/j.marenvres.2024.106605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 05/17/2024] [Accepted: 06/11/2024] [Indexed: 07/01/2024]
Abstract
Satellite-derived chlorophyll-a concentration (Chl-a) is essential for assessing environmental conditions, yet its application in the optically complex waters of the eastern Yellow Sea (EYS) is challenged. This study refines the Chl-a algorithm for the EYS employing a switching approach based on normalized water-leaving radiance at 555 nm wavelength according to turbidity conditions to investigate phytoplankton bloom patterns in the EYS. The refined Chl-a algorithm (EYS algorithm) outperforms prior algorithms, exhibiting a strong alignment with in situ Chl-a. Employing the EYS algorithm, seasonal and bloom patterns of Chl-a are detailed for the offshore and nearshore EYS areas. Distinct seasonal Chl-a patterns and factors influencing bloom initiation differed between the areas, and the peak Chl-a during the bloom period from 2018 to 2020 was significantly lower than the average year in both areas. Specifically, bimodal and unimodal peak patterns in Chl-a were observed in the offshore and nearshore areas, respectively. By investigating the relationships between environmental factors and bloom parameters, we identified that major controlling factors governing bloom initiation were mixed layer depth (MLD) and suspended particulate matter (SPM) in the offshore and nearshore areas, respectively. Additionally, this study proposed that the recent decrease in the peak Chl-a might be caused by rapid environmental changes such as the warming trend of sea surface temperature (SST) and the limitation of nutrients. For example, external forcing, phytoplankton growth, and nutrient dynamics can change due to increased SST and limitation of nutrients, which can lead to a decrease in Chl-a. This study contributes to understanding phytoplankton dynamics in the EYS, highlighting the importance of region-specific considerations in comprehending Chl-a patterns and bloom dynamics.
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Affiliation(s)
- Sungjun Kim
- Department of Oceanography and Marine Research Institute, Pusan National University, Busan, 46241, South Korea.
| | - Dabin Lee
- Coastal Disaster and Safety Research Department, Korea Institute of Ocean Science and Technology, Yeongdo-gu, Busan, 49111, South Korea.
| | - Myeongseop Kim
- Department of Oceanography and Marine Research Institute, Pusan National University, Busan, 46241, South Korea.
| | - Hyo-Keun Jang
- Oceanic Climate and Ecology Research Division, National Institute of Fisheries Science, Busan, 46083, South Korea.
| | - Sanghoon Park
- Department of Oceanography and Marine Research Institute, Pusan National University, Busan, 46241, South Korea.
| | - Yejin Kim
- Department of Oceanography and Marine Research Institute, Pusan National University, Busan, 46241, South Korea.
| | - Jaesoon Kim
- Department of Oceanography and Marine Research Institute, Pusan National University, Busan, 46241, South Korea.
| | - Jung-Woo Park
- Faculty/Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, 041-8611, Japan.
| | - Huitae Joo
- Oceanic Climate and Ecology Research Division, National Institute of Fisheries Science, Busan, 46083, South Korea.
| | - Sang-Heon Lee
- Department of Oceanography and Marine Research Institute, Pusan National University, Busan, 46241, South Korea.
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13
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Mesquita AF, Gonçalves FJM, Gonçalves AMM. Temperature influence on the sensitivity of Artemia franciscana to globally used pesticides - Oxyfluorfen and copper. CHEMOSPHERE 2024; 357:142092. [PMID: 38653396 DOI: 10.1016/j.chemosphere.2024.142092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 04/08/2024] [Accepted: 04/18/2024] [Indexed: 04/25/2024]
Abstract
Climate change further the world's human population increase is a mainstream political issue, and it's critical to search for solutions to produce enough food to feed everyone. Pesticides and fertilizers have been used as an easy solution to prevent pests and increase food production. Nevertheless, their overuse has dangerous effects on the ecosystems and communities. Oxyfluorfen (Oxy) and copper (Cu) based formulations are used as pesticides and widely applied on agricultural fields for crop protection. However, they have shown negative effects on non-target species. So, this work proposes to: a)determine the lethal concentration of Oxy and Cu to the zooplankton, Artemia franciscana, at different temperatures (15 °C, 20 °C and 25 °C); b)understand the biochemical impacts of these chemicals at the different temperatures scenarios, on A. franciscana and c)evaluate the impact of the climate changes, particularly the temperature increase, on this species sensitivity to the tested pesticides. Acute and sub-lethal bioassays with Oxy and Cu were performed at different temperatures to determine the lethal concentration of each chemical and to understand the effects of the compounds at different temperatures on the biochemical profiles of A. franciscana. Results showed an increase in chemicals toxicity with the temperature, and Oxy was revealed to be more noxious to A. franciscana than Cu; at a biochemical level, significant differences were observed among temperatures, with the biggest differences between the organisms exposed to 15 °C and 25 °C. Overall, a decrease in fatty acids (FA) and sugars was observed with the increase in Cu and oxyfluorfen concentrations. Different trends were observed with temperature increase, with FA increase in the organisms exposed to Cu and the opposite was observed in the ones exposed to oxyfluorfen. Sugar content decreases in the organisms exposed to oxyfluorfen with temperature increase and showed a non-linear behaviour in the ones exposed to Control and Cu treatments.
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Affiliation(s)
- A F Mesquita
- Department of Biology and CESAM, University of Aveiro, 3810 - 193, Aveiro, Portugal.
| | - F J M Gonçalves
- Department of Biology and CESAM, University of Aveiro, 3810 - 193, Aveiro, Portugal
| | - A M M Gonçalves
- Department of Biology and CESAM, University of Aveiro, 3810 - 193, Aveiro, Portugal; University of Coimbra, MARE - Marine and Environmental Sciences Centre / ARNET - Aquatic Research Network, Department of Life Sciences, Calçada Martim de Freitas, 3000 - 456, Coimbra, Portugal
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14
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Thibodeau PS, Puggioni G, Strock J, Borkman DG, Rynearson TA. Long-term declines in chlorophyll a and variable phenology revealed by a 60-year estuarine plankton time series. Proc Natl Acad Sci U S A 2024; 121:e2311086121. [PMID: 38739806 PMCID: PMC11127012 DOI: 10.1073/pnas.2311086121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 03/16/2024] [Indexed: 05/16/2024] Open
Abstract
Long-term ecological time series provide a unique perspective on the emergent properties of ecosystems. In aquatic systems, phytoplankton form the base of the food web and their biomass, measured as the concentration of the photosynthetic pigment chlorophyll a (chl a), is an indicator of ecosystem quality. We analyzed temporal trends in chl a from the Long-Term Plankton Time Series in Narragansett Bay, Rhode Island, USA, a temperate estuary experiencing long-term warming and changing anthropogenic nutrient inputs. Dynamic linear models were used to impute and model environmental variables (1959 to 2019) and chl a concentrations (1968 to 2019). A long-term chl a decrease was observed with an average decline in the cumulative annual chl a concentration of 49% and a marked decline of 57% in winter-spring bloom magnitude. The long-term decline in chl a concentration was directly and indirectly associated with multiple environmental factors that are impacted by climate change (e.g., warming temperatures, water column stratification, reduced nutrient concentrations) indicating the importance of accounting for regional climate change effects in ecosystem-based management. Analysis of seasonal phenology revealed that the winter-spring bloom occurred earlier, at a rate of 4.9 ± 2.8 d decade-1. Finally, the high degree of temporal variation in phytoplankton biomass observed in Narragansett Bay appears common among estuaries, coasts, and open oceans. The commonality among these marine ecosystems highlights the need to maintain a robust set of phytoplankton time series in the coming decades to improve signal-to-noise ratios and identify trends in these highly variable environments.
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Affiliation(s)
| | - Gavino Puggioni
- Department of Computer Science and Statistics, University of Rhode Island, Kingston, RI02881
| | - Jacob Strock
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI02882
| | - David G. Borkman
- Rhode Island Department of Environmental Management, Office of Water Resources–Shellfish, Providence, RI02908
| | - Tatiana A. Rynearson
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI02882
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15
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Zhao J, Zhao B, Kong N, Li M, Li F, Liu J, Wang L, Song L. Water stratification alters phytoplankton assemblages in scallop farming waters of the North Yellow Sea in China. MARINE ENVIRONMENTAL RESEARCH 2024; 196:106399. [PMID: 38387226 DOI: 10.1016/j.marenvres.2024.106399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 01/10/2024] [Accepted: 02/05/2024] [Indexed: 02/24/2024]
Abstract
As evaluation indicators of the primary productivity, the phytoplankton biomass and community structure are of great significance to the fishery industry, which can be driven by ocean currents, nutrients and water stratification. In the present study, the characteristics of phytoplankton assemblages in different water layers of a typical Yesso scallop farming area in Zhangzi Island, the North Yellow Sea were investigated from March 2021 to January 2022. According to the vertical distribution of temperature, water stratification was observed from June to August (stratification period), and disappeared in March, October and the following January with vertical homogeneity (mixing period). 18S rRNA gene sequencing results revealed that Pyrrophyta was the most dominant phylum during the sampling period, with high gene proportions in the stratification (63.36%) and mixing periods (77.35%). The gene proportion of Bacillariophyta in the stratification period was 5.44%, which was significantly lower than that in the mixing period of 8.93% (p < 0.05). Moreover, Pseudo-nitzschia, a toxin-producing taxon affiliated with Bacillariophyta, exhibited a significantly higher proportion in the stratification period than in the mixing period. During the stratification period, a number of toxin-producing taxa such as Pseudo-nitzschia and Karlodinium were enriched in the bottom layer, which was 1.29-fold and 1.37-fold of that in the surface layer, respectively. Redundancy analysis showed that phosphate and water temperature were major environmental factors driving the vertical distribution of phytoplankton assemblages. The phosphate (0.11 μM) and silicate (2.09 μM) concentrations in the surface layer approached the minimum threshold for phytoplankton growth, and the stoichiometric limitation of phosphate was detected in the surface and middle layers. Collectively, these results indicated that the decreased proportion ratio of Bacillariophyta to Pyrrophyta and unfavorable community composition of Bacillariophyta for scallops were observed during summer, which might result from the phosphate limitation driven by water stratification. The results will further our understanding of the dynamics of phytoplankton communities under the background of intensifying ocean stratification and provide ecological guidance for mollusc mariculture.
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Affiliation(s)
- Junyan Zhao
- Dalian Key Laboratory of Aquatic Animal Disease Prevention and Control, Dalian Ocean University, Dalian, 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian, 116023, China
| | - Bao Zhao
- Dalian Key Laboratory of Aquatic Animal Disease Prevention and Control, Dalian Ocean University, Dalian, 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian, 116023, China
| | - Ning Kong
- Dalian Key Laboratory of Aquatic Animal Disease Prevention and Control, Dalian Ocean University, Dalian, 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian, 116023, China
| | - Ming Li
- Zhangzidao Group Co., LTD., Dalian, 116503, China
| | - Fuzhe Li
- Dalian Key Laboratory of Aquatic Animal Disease Prevention and Control, Dalian Ocean University, Dalian, 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian, 116023, China
| | - Jinyu Liu
- Dalian Key Laboratory of Aquatic Animal Disease Prevention and Control, Dalian Ocean University, Dalian, 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian, 116023, China
| | - Lingling Wang
- Dalian Key Laboratory of Aquatic Animal Disease Prevention and Control, Dalian Ocean University, Dalian, 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian, 116023, China; Functional Laboratory of Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, China
| | - Linsheng Song
- Dalian Key Laboratory of Aquatic Animal Disease Prevention and Control, Dalian Ocean University, Dalian, 116023, China; Liaoning Key Laboratory of Marine Animal Immunology and Disease Control, Dalian Ocean University, Dalian, 116023, China; Functional Laboratory of Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China.
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16
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Xia J, Bao Y, Gao Y, Li J. The effects of temperature and sulfamethoxazole on the growth and photosynthetic characteristics of Phaeodactylum tricornutum. MARINE POLLUTION BULLETIN 2024; 200:116122. [PMID: 38340373 DOI: 10.1016/j.marpolbul.2024.116122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 11/29/2023] [Accepted: 02/01/2024] [Indexed: 02/12/2024]
Abstract
The misuse of antibiotics has brought potential ecological risks to marine ecosystems, especially under a changing climate. Laboratory experiments were conducted to understand the impact of rising temperatures and antibiotic sulfamethoxazole (SMX) abuse on marine diatom Phaeodactylum tricornutum. Temperatures of 21 and 24 °C were optimal for the growth and photosynthetic characteristics of P. tricornutum. When exposed to higher temperatures (≥27 °C), the growth and photosynthesis were inhibited. High concentrations of SMX (≥100 mg/L) caused rapid and acute toxicological effects on the phytoplankton. In contrast, low concentrations of SMX (1 mg/L) exhibited hormesis. When P. tricornutum was exposed to SMX at high temperatures, the stress on the phytoplankton was even more pronounced. This suggests that the combination of rising temperatures and antibiotic pollution may have a more significant negative impact on marine phytoplankton than either stressor alone. Neglecting the interaction between these stressors may lead to underestimating their combined effects on marine ecosystems.
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Affiliation(s)
- Jing Xia
- School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Yalin Bao
- School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Yonghui Gao
- School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Ji Li
- School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China.
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17
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Zhang Y, Yu H, Liu J, Guo Y. Analysis of water quality and the response of phytoplankton in the low-temperature environment of Majiagou Urban River, China. Heliyon 2024; 10:e25955. [PMID: 38375249 PMCID: PMC10875424 DOI: 10.1016/j.heliyon.2024.e25955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 02/03/2024] [Accepted: 02/05/2024] [Indexed: 02/21/2024] Open
Abstract
Majiagou River, a crucial urban river in Harbin, traverses densely populated areas including agricultural, suburban, and main urban areas, presenting highly intricate habitat characteristics. In recent years, urbanization has significantly intensified human interference, fundamentally reshaping the phytoplankton community. Understanding the response mechanism of phytoplankton to environmental factors is of paramount importance as they serve as primary producers in aquatic ecosystems. To investigate this, we established 25 sampling sites to analyze the phytoplankton community and 14 key physicochemical parameters, such as total phosphorus (TP) and total nitrogen (TN). Utilizing hierarchical clustering analysis (HCA) and One-way Analysis of Variance (ANOVA), we identified distinct river segments, revealing spatial distribution differences and environmental factor variations among phytoplankton species across segments. By adopting redundancy analysis (RDA), we pinpointed the primary environmental factors impacting phytoplankton communities and examined the correlation between phytoplankton and these factors to elucidate the driving mechanisms governing phytoplankton dynamics. The outcomes demonstrated that the phytoplankton community in Majiagou River was predominantly composed of Bacillariophyta and Chlorophyta, however, notable disparities in spatial distribution and species composition resulting from human interference were evident. Areas with intense human disturbance were dominated by diatoms and exhibited trends of homogenization and reduced biodiversity. RDA showed that pH, NH4+-N, NH3-N, chemical oxygen demand (COD), and TP were key environmental factors influencing phytoplankton communities. We have confirmed that due to variations in environment conditions and different levels of human disturbance, there will be some differences in the critical limiting factors affecting phytoplankton. Our study offers valuable insights for governing urban rivers during the low-temperature period.
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Affiliation(s)
- Yongxin Zhang
- College of Wildlife and Protected Area, Northeast Forestry University, No. 26 Hexing Road, Harbin 150040, China
| | - Hongxian Yu
- College of Wildlife and Protected Area, Northeast Forestry University, No. 26 Hexing Road, Harbin 150040, China
| | - Jiamin Liu
- College of Wildlife and Protected Area, Northeast Forestry University, No. 26 Hexing Road, Harbin 150040, China
| | - Yao Guo
- College of Wildlife and Protected Area, Northeast Forestry University, No. 26 Hexing Road, Harbin 150040, China
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18
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Agarwal V, Chávez-Casillas J, Inomura K, Mouw CB. Patterns in the temporal complexity of global chlorophyll concentration. Nat Commun 2024; 15:1522. [PMID: 38374303 PMCID: PMC10876569 DOI: 10.1038/s41467-024-45976-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 02/08/2024] [Indexed: 02/21/2024] Open
Abstract
Decades of research have relied on satellite-based estimates of chlorophyll-a concentration to identify oceanographic processes and plan in situ observational campaigns; however, the patterns of intrinsic temporal variation in chlorophyll-a concentration have not been investigated on a global scale. Here we develop a metric to quantify time series complexity (i.e., a measure of the ups and downs of sequential observations) in chlorophyll-a concentration and show that seemingly disparate regions (e.g., Atlantic vs Indian, equatorial vs subtropical) in the global ocean can be inherently similar. These patterns can be linked to the regularity of chlorophyll-a concentration change and the likelihood of anomalous events within the satellite record. Despite distinct spatial changes in decadal chlorophyll-a concentration, changes in time series complexity have been relatively consistent. This work provides different metrics for monitoring the global ocean and suggests that the complexity of chlorophyll-a time series can be independent of its magnitude.
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Affiliation(s)
- Vitul Agarwal
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA.
| | - Jonathan Chávez-Casillas
- Department of Mathematics and Applied Mathematical Sciences, University of Rhode Island, Kingston, RI, USA
| | - Keisuke Inomura
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA
| | - Colleen B Mouw
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA
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Fu X, Shi W, Liu Z, Wang X, Zhang G, Sun J. Impact of environmental variables on the distribution of phytoplankton communities in the Southern Yellow Sea. ENVIRONMENTAL RESEARCH 2024; 243:117862. [PMID: 38065382 DOI: 10.1016/j.envres.2023.117862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 12/01/2023] [Accepted: 12/02/2023] [Indexed: 02/06/2024]
Abstract
To gain a comprehensive understanding of the seasonal variation in the structure of phytoplankton communities in the Southern Yellow Sea (SYS), two research expeditions were conducted from 12 to 24 in April 2019, and from 12 to 22 in October of 2019. During the spring season, the phytoplankton community within the SYS was primarily comprised of diatoms and dinoflagellates, while in autumn, diatoms and cyanobacteria dominated. Thalassiosira rotula and Paralia sulcata were the dominant species in both seasons. In spring, P. sulcata displayed no obvious correlation with any environmental parameter, while in autumn, it exhibited negative correlations with environmental factors. According to the cluster and multidimensional scaling analyses, the phytoplankton community was stratified into three distinct ecological provinces in the SYS: the Western Yellow Sea, the Yellow Sea basin, and the southern coastal region. The phytoplankton community composition was predominantly affected by seasonal fluctuations in temperature and nutrient levels. Notably, the Yellow Sea basin exhibited the lowest phytoplankton abundance, largely because of the impact of the Yellow Sea Cold Water Mass. Furthermore, the presence of cyanobacteria, particularly prevalent in the Yellow Sea basin, may have been facilitated by transport mechanisms associated with the Kuroshio current. Aggregated boosted tree (ABT) and Generalized Additive models (GAM) suggested that temperature, DIN, salinity, and DIP were significant parameters of phytoplankton abundance in SYS. Additionally, the N:P nutrient ratio was a key parameter in governing the structure of phytoplankton communities during both seasons.
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Affiliation(s)
- Xiaoting Fu
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China; Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin, 300457, China; Institute for Advanced Marine Research, China University of Geosciences, Guangzhou, 511462, China
| | - Wenting Shi
- Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin, 300457, China; Institute for Advanced Marine Research, China University of Geosciences, Guangzhou, 511462, China
| | - Zishi Liu
- College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, China; Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin, 300457, China; Institute for Advanced Marine Research, China University of Geosciences, Guangzhou, 511462, China
| | - Xingzhou Wang
- College of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan, 430074, China; Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin, 300457, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, 430074, China; Institute for Advanced Marine Research, China University of Geosciences, Guangzhou, 511462, China
| | - Guicheng Zhang
- Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin, 300457, China
| | - Jun Sun
- College of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan, 430074, China; Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin, 300457, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan, 430074, China; Institute for Advanced Marine Research, China University of Geosciences, Guangzhou, 511462, China.
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20
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Bi D, Cao L, An Y, Xu J, Wu Y. Short-term responses of temperate and subarctic marine diatoms to Irgarol 1051 and UV radiation: Insights into temperature interactions. PLoS One 2024; 19:e0295686. [PMID: 38324513 PMCID: PMC10849241 DOI: 10.1371/journal.pone.0295686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 11/27/2023] [Indexed: 02/09/2024] Open
Abstract
Phytoplankton face numerous pressures resulting from chemical and physical stressors, primarily induced by human activities. This study focuses on investigating the interactive effects of widely used antifouling agent Irgarol 1051 and UV radiation on the photo-physiology of marine diatoms from diverse latitudes, within the context of global warming. Our findings clearly shown that both Irgarol and UV radiation have a significant inhibitory impact on the photochemical performance of the three diatoms examined, with Irgarol treatment exhibiting more pronounced effects. In the case of the two temperate zone diatoms, we observed a decrease in the inhibition induced by Irgarol 1051 and UVR as the temperature increased up to 25°C. Similarly, for the subarctic species, an increase in temperature resulted in a reduction in the inhibition caused by Irgarol and UVR. These results suggest that elevated temperatures can mitigate the short-term inhibitory effects of both Irgarol and UVR on diatoms. Furthermore, our data indicate that increased temperature could significantly interact with UVR or Irgarol for temperate diatoms, while this was not the case for cold water diatoms, indicating temperate and subarctic diatoms may respond differentially under global warming.
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Affiliation(s)
- Dongquan Bi
- Jiangsu Key Laboratory of Marine Bioresources and Environment/Co-Innovation Center of Jiangsu Marine Bio-Industry Technology, Jiangsu Ocean University, Lianyungang, China
| | - Lixin Cao
- Jiangsu Key Laboratory of Marine Bioresources and Environment/Co-Innovation Center of Jiangsu Marine Bio-Industry Technology, Jiangsu Ocean University, Lianyungang, China
| | - Yuheng An
- Jiangsu Key Laboratory of Marine Bioresources and Environment/Co-Innovation Center of Jiangsu Marine Bio-Industry Technology, Jiangsu Ocean University, Lianyungang, China
| | - Juntian Xu
- Jiangsu Key Laboratory of Marine Bioresources and Environment/Co-Innovation Center of Jiangsu Marine Bio-Industry Technology, Jiangsu Ocean University, Lianyungang, China
- Key Laboratory of Coastal Salt Marsh Ecosystems and Resources Ministry of Natural Resources, Jiangsu Ocean University, Lianyungang, China
| | - Yaping Wu
- Jiangsu Key Laboratory of Marine Bioresources and Environment/Co-Innovation Center of Jiangsu Marine Bio-Industry Technology, Jiangsu Ocean University, Lianyungang, China
- Key Laboratory of Coastal Salt Marsh Ecosystems and Resources Ministry of Natural Resources, Jiangsu Ocean University, Lianyungang, China
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21
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Kim HG, Cha Y, Cho KH. Projected climate change impact on cyanobacterial bloom phenology in temperate rivers based on temperature dependency. WATER RESEARCH 2024; 249:120928. [PMID: 38043354 DOI: 10.1016/j.watres.2023.120928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/23/2023] [Accepted: 11/24/2023] [Indexed: 12/05/2023]
Abstract
Climate warming is linked to earlier onset and extended duration of cyanobacterial blooms in temperate rivers. This causes an unpredictable extent of harm to the functioning of the ecosystem and public health. We used Microcystis spp. cell density data monitored for seven years (2016-2022) in ten sites across four temperate rivers of the Republic of Korea to define the phenology of cyanobacterial blooms and elucidate the climatic effect on their pattern. The day of year marking the onset, peak, and end of Microcystis growth were estimated using a Weibull function, and linear mixed-effect models were employed to analyze their relationships with environmental variables. These models identified river-specific temperatures at the beginning and end dates of cyanobacterial blooms. Furthermore, the most realistic models were employed to project future Microcystis bloom phenology, considering downscaled and quantile-mapped regional air temperatures from a general circulation model. Daily minimum and daily maximum air temperatures (mintemp and maxtemp) primarily drove the timing of the beginning and end of the bloom, respectively. The models successfully captured the spatiotemporal variations of the beginning and end dates, with mintemp and maxtemp predicted to be 24℃ (R2 = 0.68) and 16℃ (R2 = 0.35), respectively. The beginning and end dates were projected to advance considerably in the future under the Representative Concentration Pathway 2.6, 4.5, and 8.5. The simulations suggested that the largest uncertainty lies in the timing of when the bloom ends, whereas the timing of when blooming begins has less variation. Our study highlights the dependency of cyanobacterial bloom phenology on temperatures and earlier and prolonged bloom development.
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Affiliation(s)
- Hyo Gyeom Kim
- School of Civil, Environmental, and Architectural Engineering, Korea University, Seoul 02841, the Republic of Korea
| | - YoonKyung Cha
- School of Environmental Engineering, University of Seoul, Seoul, the Republic of Korea
| | - Kyung Hwa Cho
- School of Civil, Environmental, and Architectural Engineering, Korea University, Seoul 02841, the Republic of Korea.
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22
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Thompson C, Bacha L, Paz PHC, de Assis Passos Oliveira M, Oliveira BCV, Omachi C, Chueke C, de Lima Hilário M, Lima M, Leomil L, Felix-Cordeiro T, da Cruz TLC, Otsuki K, Vidal L, Thompson M, Ribeiro E Silva R, Cabezas CMV, Veríssimo BM, Zaganelli JL, Botelho ACN, Teixeira L, Cosenza C, Costa PM, Landuci F, Tschoeke DA, Silva TA, Attias M, de Souza W, de Rezende CE, Thompson F. Collapse of scallop Nodipecten nodosus production in the tropical Southeast Brazil as a possible consequence of global warming and water pollution. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 904:166873. [PMID: 37689208 DOI: 10.1016/j.scitotenv.2023.166873] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 09/01/2023] [Accepted: 09/04/2023] [Indexed: 09/11/2023]
Abstract
Mollusc rearing is a relevant global socioeconomic activity. However, this activity has faced severe problems in the last years in southeast Brazil. The mariculture scallop production dropped from 51,2 tons in 2016 to 10,2 tons in 2022 in the Baia da Ilha Grande (BIG; Rio de Janeiro). However, the possible causes of this collapse are unknown. This study aimed to analyze decadal trends of water quality in Nodipecten nodosus spat and adult production in BIG. We also performed physical-chemical and biological water quality analyses of three scallop farms and two nearby locations at BIG in 2022 to evaluate possible environmental stressors and risks. Scallop spat production dropped drastically in the last five years (2018-2022: mean ± stdev: 0.47 ± 0.45 million). Spat production was higher in colder waters and during peaks of Chlorophyll a in the last 13 years. Reduction of Chlorophyll a coincided with decreasing spat production in the last five years. Warmer periods (>27 °C) of the year may hamper scallop development. Counts of potentially pathogenic bacteria (Vibrios) and Escherichia coli were significantly higher in warmer periods which may further reduce scallop productivity. Shotgun metagenomics of seawater samples from the five studied corroborated these culture-based counts. Vibrios and fecal indicator bacteria metagenomic sequences were abundant across the entire study area throughout 2022. The results of this study suggest the collapse of scallop mariculture is the result of a synergistic negative effect of global warming and poor seawater quality.
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Affiliation(s)
- Cristiane Thompson
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
| | - Leonardo Bacha
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil; Fuzzy Lab, Politécnica, UFRJ, Rio de Janeiro, Brazil
| | - Pedro Henrique C Paz
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | | | - Braulio Cherene Vaz Oliveira
- Laboratory of Environmental Sciences (LCA), Center of Biosciences and Biotechnology (CBB), State University of Northern of Rio de Janeiro Darcy Ribeiro (UENF), Campos dos Goytacazes, Brazil
| | - Claudia Omachi
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Caroline Chueke
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Marcela de Lima Hilário
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Michele Lima
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Luciana Leomil
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Thais Felix-Cordeiro
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Thalya Lou Cordeiro da Cruz
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Koko Otsuki
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Livia Vidal
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Mateus Thompson
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil; Fisheries Institute of the Rio de Janeiro State (FIPERJ), Niterói, Brazil
| | - Renan Ribeiro E Silva
- Instituto de Sócio Desenvolvimento da Baia da Ilha Grande (IED-BIG), Angra dos Reis, Brazil
| | | | - Bruno Marque Veríssimo
- Instituto de Sócio Desenvolvimento da Baia da Ilha Grande (IED-BIG), Angra dos Reis, Brazil
| | - José Luiz Zaganelli
- Instituto de Sócio Desenvolvimento da Baia da Ilha Grande (IED-BIG), Angra dos Reis, Brazil
| | - Ana Caroline N Botelho
- Institute of Microbiology Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Lucia Teixeira
- Institute of Microbiology Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Paulo Marcio Costa
- Fisheries Institute of the Rio de Janeiro State (FIPERJ), Niterói, Brazil
| | - Felipe Landuci
- Fisheries Institute of the Rio de Janeiro State (FIPERJ), Niterói, Brazil
| | - Diogo A Tschoeke
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil; Biomedical Engineer Program, COPPE, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | | | - Marcia Attias
- Laboratory of Cell Ultrastructure Hertha Meyer (CENABIO), UFRJ, Brazil
| | | | - Carlos E de Rezende
- Laboratory of Environmental Sciences (LCA), Center of Biosciences and Biotechnology (CBB), State University of Northern of Rio de Janeiro Darcy Ribeiro (UENF), Campos dos Goytacazes, Brazil
| | - Fabiano Thompson
- Laboratory of Microbiology, Institute of Biology, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
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23
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Malinowski CR, Searle CL, Schaber J, Höök TO. Microplastics impact simple aquatic food web dynamics through reduced zooplankton feeding and potentially releasing algae from consumer control. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 904:166691. [PMID: 37659532 DOI: 10.1016/j.scitotenv.2023.166691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Revised: 08/25/2023] [Accepted: 08/28/2023] [Indexed: 09/04/2023]
Abstract
Concentrations of microplastics in aquatic environments continue to rise due to industrial production and pollution. While there are various concerns regarding potential deleterious effects of microplastics on ecosystems, several knowledge gaps remain, including the potential for microplastics to directly and indirectly affect biotic interactions and food web dynamics. We explored the effects of environmentally relevant microplastic concentrations on two co-exposed species of herbaceous freshwater crustaceous zooplankton, filter feeding Daphnia dentifera and selective phytoplankton grazers Arctodiaptomus dorsalis. Study organisms were exposed to different concentrations of microplastics (plastic polyethylene microspheres; low = 2.38 × 10-8 mg/L, medium = 0.023 mg/L, high = 162 mg/L), phytoplankton prey, and predator cues, simulating a simple freshwater food web. Microplastic uptake was greater by D. dentifera, but both species were characterized by decreased algal consumption in the highest microplastic concentration treatment. Importantly, aqueous chlorophyll-a concentrations at the conclusion of the experiment were greater for the high microplastic treatment than all controls and other microplastic treatments. Finally, a predator effect was only apparent for D. dentifera, with greater microplastic uptake in the presence of a predator. We conclude that microplastics may adversely impact the ability of zooplankton to feed on algae and potentially release algae from consumptive control by herbivorous zooplankton. SYNOPSIS: This research aimed to better understand the broader food web effects of environmentally relevant microplastic concentrations on aquatic communities.
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Affiliation(s)
- Christopher R Malinowski
- Purdue University, Department of Forestry and Natural Resources, 195 Marsteller St., West Lafayette, IN 47907, USA; Ocean First Institute, 51 Shoreland Drive, Key Largo, FL 33037, USA.
| | - Catherine L Searle
- Purdue University, Department of Biological Sciences, 915 W. State Street, West Lafayette, IN 47907, USA
| | - James Schaber
- Purdue University, Bindley Bioscience Center, 1275 3(rd) St., West Lafayette, IN 47906, USA
| | - Tomas O Höök
- Purdue University, Department of Forestry and Natural Resources, 195 Marsteller St., West Lafayette, IN 47907, USA; Illinois-Indiana Sea Grant College Program, 195 Marsteller St., West Lafayette, IN 47907, USA
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24
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Jiang HB, Hutchins DA, Ma W, Zhang RF, Wells M, Jiao N, Wang Y, Chai F. Natural ocean iron fertilization and climate variability over geological periods. GLOBAL CHANGE BIOLOGY 2023; 29:6856-6866. [PMID: 37855153 DOI: 10.1111/gcb.16990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 09/20/2023] [Accepted: 09/27/2023] [Indexed: 10/20/2023]
Abstract
Marine primary producers are largely dependent on and shape the Earth's climate, although their relationship with climate varies over space and time. The growth of phytoplankton and associated marine primary productivity in most of the modern global ocean is limited by the supply of nutrients, including the micronutrient iron. The addition of iron via episodic and frequent events drives the biological carbon pump and promotes the sequestration of atmospheric carbon dioxide (CO2 ) into the ocean. However, the dependence between iron and marine primary producers adaptively changes over different geological periods due to the variation in global climate and environment. In this review, we examined the role and importance of iron in modulating marine primary production during some specific geological periods, that is, the Great Oxidation Event (GOE) during the Huronian glaciation, the Snowball Earth Event during the Cryogenian, the glacial-interglacial cycles during the Pleistocene, and the period from the last glacial maximum to the late Holocene. Only the change trend of iron bioavailability and climate in the glacial-interglacial cycles is consistent with the Iron Hypothesis. During the GOE and the Snowball Earth periods, although the bioavailability of iron in the ocean and the climate changed dramatically, the changing trend of many factors contradicted the Iron Hypothesis. By detangling the relationship among marine primary productivity, iron availability and oceanic environments in different geological periods, this review can offer some new insights for evaluating the impact of ocean iron fertilization on removing CO2 from the atmosphere and regulating the climate.
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Affiliation(s)
- Hai-Bo Jiang
- Key Laboratory of Marine Biotechnology of Zhejiang Province, School of Marine Sciences, Ningbo University, Ningbo, Zhejiang, China
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, Zhejiang, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, Guangdong, China
| | - David A Hutchins
- Department of Biological Sciences, University of Southern California, Los Angeles, California, USA
| | - Wentao Ma
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, Zhejiang, China
| | - Rui-Feng Zhang
- School of Oceanography, Shanghai Jiaotong University, Shanghai, Shanghai, China
| | - Mark Wells
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, Zhejiang, China
- School of Marine Sciences, University of Maine, Orono, Maine, USA
| | - Nianzhi Jiao
- State Key Laboratory of Marine Environmental Sciences, Xiamen University, Xiamen, Fujian, China
| | - Yuntao Wang
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, Zhejiang, China
| | - Fei Chai
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, Zhejiang, China
- State Key Laboratory of Marine Environmental Sciences, Xiamen University, Xiamen, Fujian, China
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25
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Zhang Y, Ma S, Yang X, Wang Y, Hu Y, Xie R, Li J, Han Y, Zhang H, Zhang Y. Effect of ocean warming on pigment and photosynthetic carbon fixation of plankton assemblage in Pingtan Island of Southeast China. MARINE ENVIRONMENTAL RESEARCH 2023; 192:106196. [PMID: 37751645 DOI: 10.1016/j.marenvres.2023.106196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 09/16/2023] [Accepted: 09/20/2023] [Indexed: 09/28/2023]
Abstract
Temperature plays an important role in affecting the physiological traits of marine plankton. In this study, we conducted an outdoor incubation experiment to investigate the effects of elevated temperature on Chl a, photosynthetic carbon fixation and the composition of plankton communities in the surface seawater around Pingtan Island, the northwest Taiwan Strait in Autumn 2022. After 3-4 days of incubation, elevated temperature (1-4 °C higher than ambient temperature) led to a decrease in Chl a concentration across all three stations, did not result in significant increases in the particulate organic carbon (POC) and nitrogen (PON) concentrations in seawater with high nitrate concentrations, whereas increased POC and PON concentrations in nitrate-limited seawater. These findings suggest that the effect of temperature on the POC and PON contents of plankton is affected by the availability of nitrate. Diatoms were the dominant phytoplankton group in all three stations. Our results indicate that ocean warming has a potential to increase the POC contents of marine plankton per volume of seawater, which may increase the ability of phytoplankton to absorb atmospheric CO2 and to alleviate global warming.
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Affiliation(s)
- Yong Zhang
- College of Environmental and Resource Sciences, College of Carbon Neutral Modem Industry, Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, 350117, China
| | - Shuai Ma
- College of Environmental and Resource Sciences, College of Carbon Neutral Modem Industry, Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, 350117, China
| | - Xiang Yang
- College of Environmental and Resource Sciences, College of Carbon Neutral Modem Industry, Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, 350117, China
| | - Yingrui Wang
- College of Environmental and Resource Sciences, College of Carbon Neutral Modem Industry, Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, 350117, China
| | - Yubin Hu
- Institute of Marine Science and Technology, Shandong University, Qingdao, Shandong, 266237, China
| | - Rongrong Xie
- College of Environmental and Resource Sciences, College of Carbon Neutral Modem Industry, Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, 350117, China
| | - Jiabing Li
- College of Environmental and Resource Sciences, College of Carbon Neutral Modem Industry, Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, 350117, China
| | - Yonghe Han
- College of Environmental and Resource Sciences, College of Carbon Neutral Modem Industry, Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, 350117, China
| | - Hong Zhang
- College of Environmental and Resource Sciences, College of Carbon Neutral Modem Industry, Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, 350117, China
| | - Yong Zhang
- College of Environmental and Resource Sciences, College of Carbon Neutral Modem Industry, Fujian Key Laboratory of Pollution Control and Resource Recycling, Fujian Normal University, Fuzhou, 350117, China; Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, 210023, China.
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26
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Rueda Moreno G, Sasaki MC. Starvation reduces thermal limits of the widespread copepod Acartia tonsa. Ecol Evol 2023; 13:e10586. [PMID: 37799447 PMCID: PMC10547671 DOI: 10.1002/ece3.10586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 09/11/2023] [Accepted: 09/22/2023] [Indexed: 10/07/2023] Open
Abstract
Organismal thermal limits affect a wide range of biogeographical and ecological processes. Copepods are some of the most abundant animals on the planet and play key roles in aquatic habitats. Despite their abundance and ecological importance, there is limited data on the factors that affect copepod thermal limits, impeding our ability to predict how aquatic ecosystems will be affected by anthropogenic climate change. In a warming ocean, one factor that may have particularly important effects on thermal limits is the availability of food. A recently proposed feedback loop known as "metabolic meltdown" suggests that starvation and exposure to high temperatures interact to drastically reduce organismal thermal limits, increasing vulnerability to warming. To investigate one component of this feedback loop, we examined how starvation affects thermal limits (critical thermal maxima: CTmax) of Acartia tonsa, a widespread estuarine copepod. We found that there was no effect of short-duration exposure to starvation (up to 2 days). However, after 3 days, there was a significant decrease in the CTmax of starved copepods relative to the fed controls. Our results provide empirical evidence that extended periods of starvation reduce thermal limits, potentially initiating "metabolic meltdown" in this key species of coastal copepod. This suggests that changes in food availability may increase the vulnerability of copepods to increasing temperatures, amplifying the effects of climate change on coastal systems.
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Affiliation(s)
| | - Matthew C. Sasaki
- Department of Marine SciencesUniversity of ConnecticutGrotonConnecticutUSA
- Department of BiologyUniversity of VermontBurlingtonVermontUSA
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27
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Zheng B, Du Y, Deng Y, Zhao T, Dong P, Shi J, Wu Z. Colonial morphology weakens the response of different inorganic carbon uptake systems to CO 2 levels in Microcystis population. HARMFUL ALGAE 2023; 128:102491. [PMID: 37714577 DOI: 10.1016/j.hal.2023.102491] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 08/08/2023] [Accepted: 08/16/2023] [Indexed: 09/17/2023]
Abstract
Rising atmospheric CO2 concentration negatively impacts aquatic ecosystems and may induce evolutionary changes in the CO2-concentrating mechanism (CCM) of cyanobacteria. As the most notorious freshwater cyanobacteria, Microcystis strains have high phenotypic plasticity to form colonies and blooms in lakes and reservoirs worldwide. However, phenotypic plasticity of Microcystis responses to elevated CO2 is still a major open question. Here, we studied how Microcystis strains with two genotype of inorganic carbon uptake systems, bicA and sbtA, and different colonial morphology response to 200 ppm, 400 ppm, and 800 ppm CO2 levels. The results revealed that sbtA genotypes showed significantly higher specific growth rates, Chl a concentration, and photosynthetic efficiency at 200 ppm CO2, whereas higher specific growth rates, Chl a concentration, and photosynthetic efficiency were found in bicA genotype at 800 ppm CO2. The highest values of specific growth rates, Chl a concentration, Fv/Fm, and maximal net photosynthesis (Pm) were observed in unicellular morphology, followed by small colony and large colonial morphology at all CO2 levels. The values of K0.5 (DIC), K0.5 (CO2), and K0.5 (HCO3-) in the large colonials increased with rising CO2 levels, but these values significantly decreased in the unicellular and small colonials. ANOSIM analysis indicated that colonial morphology reduced significantly inter-group differences between bicA and sbtA genotypes at all CO2 treatments. These results suggest that colonial morphology of Microcystis can weakens the response of different inorganic carbon uptake systems to CO2 levels. Moreover, phenotypic and genotypic plasticity is likely to broaden strongly the fitness of Microcystis from rising atmospheric CO2.
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Affiliation(s)
- Baohai Zheng
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China
| | - Yuxin Du
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China
| | - Yuting Deng
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China
| | - Teng Zhao
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China
| | - Peichang Dong
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China
| | - Junqiong Shi
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China
| | - Zhongxing Wu
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China.
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Chen W, Wang X, Yang S. Response of phytoplankton community structure to environmental changes in the coastal areas of northern China. MARINE POLLUTION BULLETIN 2023; 195:115300. [PMID: 37659389 DOI: 10.1016/j.marpolbul.2023.115300] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 07/11/2023] [Accepted: 07/14/2023] [Indexed: 09/04/2023]
Abstract
In this study, we analyzed high-frequency data pertaining to phytoplankton and environmental factors in Jiaozhou Bay from December 10, 2004, to December 10, 2005 and from July 26, 2020, to August 1, 2021. Compared with 2004-2005, the abundance of phytoplankton during 2020-2021 presented a "two-peak pattern" of annual variation, and the number of species decreased significantly. The ecological types were dominated by eurythermal species, while cold-water species declined. The overall abundance showed a downward trend, and the peak period moved to a time with lower water temperature. This could be attributed to the increase in sea surface temperature. The increase in water temperature and intensification of eutrophication made the emergence of dominant species more inclined to be single; the diversity and stability of the community structure decreased. Generalized additive model (GAM) and network analysis showed that temperature was the main driving factor influencing the phytoplankton community structure, especially during the peak period. In addition, nitrogen and phosphorus were important factors influencing species composition and competitive advantage of phytoplankton.
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Affiliation(s)
- Wenqing Chen
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Xiajie Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China
| | - Shimin Yang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
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Specchia V, Zangaro F, Tzafesta E, Saccomanno B, Vadrucci MR, Pinna M. Environmental DNA detects biodiversity and ecological features of phytoplankton communities in Mediterranean transitional waters. Sci Rep 2023; 13:15192. [PMID: 37709858 PMCID: PMC10502138 DOI: 10.1038/s41598-023-42389-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 09/09/2023] [Indexed: 09/16/2023] Open
Abstract
Climate changes and anthropogenic pressures are causing a biodiversity decline in terms of species number and genetic diversity, reducing the adaptability and evolvability of natural communities. Transitional water ecosystems are more sensitive to habitat reduction and degradation and, thus, are more exposed to biodiversity declines requiring biodiversity monitoring programs for their conservation. Environmental DNA (eDNA) metabarcoding represents a high-throughput tool for biodiversity assessment that is facilitating data collection for biodiversity monitoring. In this study, we applied, for the first time, eDNA metabarcoding in a Mediterranean coastal lagoon to assess the ecological features of eukaryotic phytoplankton communities. We sampled water in seven different lagoon sites and amplified the extracted DNA with primers targeting the variable region 4 (V4) of the 18S rRNA gene marker. The results demonstrated the validity of eDNA studies to provide insights into lagoon phytoplankton composition, establish the structure and spatial variation of phytoplankton communities, and evaluate its correlation to abiotic factors. Finally, the genetic distances analysis suggests that the different spatial distribution of OTUs, at least for the Tetraselmis genus, reflects the genetic background.
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Affiliation(s)
- Valeria Specchia
- Department of Biological and Environmental Sciences and Technologies, DiSTeBA, University of Salento, via Monteroni 165, 73100, Lecce, Italy.
- NBFC, National Biodiversity Future Center, 90133, Palermo, Italy.
| | - Francesco Zangaro
- Department of Biological and Environmental Sciences and Technologies, DiSTeBA, University of Salento, via Monteroni 165, 73100, Lecce, Italy
| | - Eftychia Tzafesta
- Department of Biological and Environmental Sciences and Technologies, DiSTeBA, University of Salento, via Monteroni 165, 73100, Lecce, Italy
| | - Benedetta Saccomanno
- Department of Biological and Environmental Sciences and Technologies, DiSTeBA, University of Salento, via Monteroni 165, 73100, Lecce, Italy
| | - Maria Rosaria Vadrucci
- Regional Agency for the Environmental Prevention and Protection (ARPA Puglia), Corso Trieste 27, Bari, Italy
| | - Maurizio Pinna
- Department of Biological and Environmental Sciences and Technologies, DiSTeBA, University of Salento, via Monteroni 165, 73100, Lecce, Italy.
- NBFC, National Biodiversity Future Center, 90133, Palermo, Italy.
- Research Centre for Fisheries and Aquaculture of Acquatina di Frigole, DiSTeBA, University of Salento, 73100, Lecce, Italy.
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deMayo JA, Brennan RS, Pespeni MH, Finiguerra M, Norton L, Park G, Baumann H, Dam HG. Simultaneous warming and acidification limit population fitness and reveal phenotype costs for a marine copepod. Proc Biol Sci 2023; 290:20231033. [PMID: 37670582 PMCID: PMC10510449 DOI: 10.1098/rspb.2023.1033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 07/25/2023] [Indexed: 09/07/2023] Open
Abstract
Phenotypic plasticity and evolutionary adaptation allow populations to cope with global change, but limits and costs to adaptation under multiple stressors are insufficiently understood. We reared a foundational copepod species, Acartia hudsonica, under ambient (AM), ocean warming (OW), ocean acidification (OA), and combined ocean warming and acidification (OWA) conditions for 11 generations (approx. 1 year) and measured population fitness (net reproductive rate) derived from six life-history traits (egg production, hatching success, survival, development time, body size and sex ratio). Copepods under OW and OWA exhibited an initial approximately 40% fitness decline relative to AM, but fully recovered within four generations, consistent with an adaptive response and demonstrating synergy between stressors. At generation 11, however, fitness was approximately 24% lower for OWA compared with the AM lineage, consistent with the cost of producing OWA-adapted phenotypes. Fitness of the OWA lineage was not affected by reversal to AM or low food environments, indicating sustained phenotypic plasticity. These results mimic those of a congener, Acartia tonsa, while additionally suggesting that synergistic effects of simultaneous stressors exert costs that limit fitness recovery but can sustain plasticity. Thus, even when closely related species experience similar stressors, species-specific costs shape their unique adaptive responses.
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Affiliation(s)
- James A. deMayo
- Department of Marine Sciences, University of Connecticut, Groton, CT, USA
| | - Reid S. Brennan
- Department of Biology, University of Vermont, Burlington, VT, USA
- Marine Evolutionary Ecology, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - Melissa H. Pespeni
- Marine Evolutionary Ecology, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - Michael Finiguerra
- Department of Ecology and Evolutionary Biology, University of Connecticut, Groton, CT, USA
| | - Lydia Norton
- Department of Marine Sciences, University of Connecticut, Groton, CT, USA
| | - Gihong Park
- Department of Marine Sciences, University of Connecticut, Groton, CT, USA
| | - Hannes Baumann
- Department of Marine Sciences, University of Connecticut, Groton, CT, USA
| | - Hans G. Dam
- Department of Marine Sciences, University of Connecticut, Groton, CT, USA
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Godrijan J, Marić Pfannkuchen D, Djakovac T, Frka S, Gašparović B. Lipids of different phytoplankton groups differ in sensitivity to degradation: Implications for carbon export. GLOBAL CHANGE BIOLOGY 2023; 29:5075-5086. [PMID: 37386730 DOI: 10.1111/gcb.16839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 02/14/2023] [Accepted: 05/31/2023] [Indexed: 07/01/2023]
Abstract
The future of life on Earth depends on how the ocean might change, as it plays an important role in mitigating the effects of global warming. The main role is played by phytoplankton. Not only are phytoplankton the base of the oceans' food web, but they also play an important role in the biological carbon pump (BCP), the process of forming organic matter (OM) and transporting it to the deep sea, representing a sink of atmospheric CO2 . Lipids are considered important vectors for carbon sequestration. A change in the phytoplankton community composition as a result of ocean warming is expected to affect the BCP. Many predictions indicate a dominance of small at the expense of large phytoplankton. To gain insight into interplay between the phytoplankton community structure, lipid production and degradation, and adverse environmental conditions, we analyzed phytoplankton composition, particulate organic carbon (POC) and its lipid fraction in the northern Adriatic over a period from winter to summer at seven stations with a gradient of trophic conditions. We found that at high salinity and low nutrient content, where nanophytoplankton prevailed over diatoms, the newly fixed carbon is substantially directed toward the synthesis of lipids. Lipids produced by nanophytoplankton, coccolithophores, and phytoflagellates, are more resistant to degradation than those produced by diatoms. The difference in lipid degradability is discussed as a difference in the size of the cell phycosphere. We hypothesize that the lipids of nanophytoplankton are less degradable due to the small phycosphere with a poorer bacterial community and consequently a lower lipid degradation rate compared with diatoms. The lipid chemical composition of the different phytoplankton groups could have a different susceptibility to degradation. Results suggest a successful lipid carbon sink of nanophytoplankton and, thus, a negative feedback on global warming.
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Affiliation(s)
- Jelena Godrijan
- Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia
| | | | - Tamara Djakovac
- Center for Marine Research (CMR), Ruđer Bošković Institute, Rovinj, Croatia
| | - Sanja Frka
- Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia
| | - Blaženka Gašparović
- Division for Marine and Environmental Research, Ruđer Bošković Institute, Zagreb, Croatia
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El-Sheekh M, Abu-Faddan M, Abo-Shady A, Nassar MZA, Labib W. Seasonal dynamics of phytoplankton in the northern part of Suez Gulf, Egypt. ENVIRONMENTAL MONITORING AND ASSESSMENT 2023; 195:1060. [PMID: 37592114 PMCID: PMC10435403 DOI: 10.1007/s10661-023-11688-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Accepted: 08/07/2023] [Indexed: 08/19/2023]
Abstract
This study was conducted to evaluate the seasonal variability of phytoplankton in the northern part of the Gulf of Suez (Suez Bay), considering the contribution of physicochemical parameters of bay water in shaping the dynamics, and eutrophication assessment. Water and phytoplankton samples were collected seasonally at nine stations in the Suez Bay during the period from the winter to autumn of 2012. A total of 423 phytoplankton species were identified, comprised mainly of 224 diatoms, 127 dinoflagellates, 33 cyanophytes, 20 chlorophytes, and 9 euglenophytes; the rest of the species (10 species) belong to other six groups. Of these, 28 species were potentially harmful. The total phytoplankton abundance exhibits a significant seasonal variation, with the autumn being the most fertile season, followed by the winter due to the proliferation of diatom species Thalassionema nitzschioides and Proboscia alata f. gracillima, respectively. While the seasonal species richness indicates that the winter attained the highest number of species, followed by summer. Generally, the major diatom genera were Chaetoceros (16 species), Navicula (15 species), Nitzschia (15 species), and Amphora (14 species), while dinoflagellates were principally composed of the genera Protoperidinium (34 species), and Tripos (26 species). Water temperature, pH, salinity, nitrate, and nitrite were the most important explanatory parameters in regard to phytoplankton abundance and chlorophyll a concentration. In addition, the phytoplankton stability exhibited a significant positive relationship with the mean values of dissolved oxygen and biological oxygen demand and the variability of salinity and phosphate, while a negative relationship was observed with ammonia and nitrite and the variability of nitrate. Based on the trophic index (TRIX), the bay water was classified as mesotrophic (moderately polluted) for almost the entire year except in the autumn as it turned eutrophic. The results explored the potential importance of the environmental heterogeneity in the bay as a key structuring mechanism of phytoplankton abundance and biomass, influenced by anthropogenic activities.
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Affiliation(s)
- Mostafa El-Sheekh
- Botany Department, Faculty of Science, Tanta University, Tanta, Egypt.
| | | | - Atef Abo-Shady
- Botany Department, Faculty of Science, Tanta University, Tanta, Egypt
| | | | - Wagdy Labib
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
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Akada H, Kodama T, Yamaguchi T. Eutrophication trends in the coastal region of the Great Tokyo area based on long-term trends of Secchi depth. PeerJ 2023; 11:e15764. [PMID: 37529211 PMCID: PMC10389074 DOI: 10.7717/peerj.15764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 06/27/2023] [Indexed: 08/03/2023] Open
Abstract
Background The coastal ocean's environment has changed owing to human activity, with eutrophication becoming a global concern. However, oligotrophication occurs locally and decreases fish production. Historically, the Secchi depth has been used as an index of primary productivity. We analyzed the results of over-a-half-century routine observations conducted in Sagami Bay and Tokyo Bay to verify the eutrophication/oligotrophication trend based on Secchi depth observations in a temperate coastal region near the Greater Tokyo area, which is highly affected by human activities. Methods Data recorded in the Kanagawa Prefecture from 1963 to 2018 were used in this study. After quality control, the observation area was divided into Tokyo Bay, the Uraga Channel (outer part of Tokyo Bay), Sagami Bay (northern part), and Sagami Nada (southern part of Sagami Bay) based on temperature and salinity at a depth of 10 m. Because the environmental parameters showed autocorrelation, time-series and correlation analyses were conducted using generalized least squares (GLS) models with a Prais-Winsten estimator. Results The Secchi depth was the shallowest in Tokyo Bay, followed by the Uraga Channel, Sagami Bay, and Sagami Nada, and was deep in winter (December and January), and shallow in summer (July) in all regions. The correlated analyses using the GLS model indicated that the shallowing of Secchi depth was significantly associated with decreases in temperature, salinity, and phosphate concentration. However, time-series analyses using GLS models indicated that the Secchi depth was significantly shallower, except in Tokyo Bay, where the surface temperature was significantly warming and the surface phosphate and nitrite concentrations decreased everywhere. A significant shallowing trend of the Secchi depth was mostly observed during the light-limiting season (January-March). Discussion Correlation analyses suggested the importance of horizontal advective transport, particularly from Tokyo Bay, which has cold and less saline eutrophic water. However, long-term shallowing of the Secchi depth was associated with warming, and changes in salinity were not significant in most months when the Secchi depth trend was significant. Thus, horizontal advection is not the primary cause of long-term eutrophication. Because the eutrophication trend was primarily observed in winter, when light is the major limiting factor of primary production, we concluded that warming provides a better photoenvironment for phytoplankton growth and induces eutrophication. As a decline in anthropogenic nutrient input after 1990s was reported in the investigated area, the long-term eutrophication trend was most likely caused due to global warming, which is another alarming impact resulting from human activities.
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Affiliation(s)
- Hideyuki Akada
- Kanagawa Prefectural Fisheries Technology Center, Miura, Kanagawa, Japan
| | - Taketoshi Kodama
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan
| | - Tamaha Yamaguchi
- Fisheries Resources Institute, Fisheries Research and Education Agency, Yokohama, Kanagawa, Japan
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Tinta T, Zhao Z, Bayer B, Herndl GJ. Jellyfish detritus supports niche partitioning and metabolic interactions among pelagic marine bacteria. MICROBIOME 2023; 11:156. [PMID: 37480075 PMCID: PMC10360251 DOI: 10.1186/s40168-023-01598-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 06/13/2023] [Indexed: 07/23/2023]
Abstract
BACKGROUND Jellyfish blooms represent a significant but largely overlooked source of labile organic matter (jelly-OM) in the ocean, characterized by a high protein content. Decaying jellyfish are important carriers for carbon export to the ocean's interior. To accurately incorporate them into biogeochemical models, the interactions between microbes and jelly-OM have yet to be fully characterized. We conducted jelly-OM enrichment experiments in microcosms to simulate the scenario experienced by the coastal pelagic microbiome after the decay of a jellyfish bloom. We combined metagenomics, endo- and exo-metaproteomic approaches to obtain a mechanistic understanding on the metabolic network operated by the jelly-OM degrading bacterial consortium. RESULTS Our analysis revealed that OM released during the decay of jellyfish blooms triggers a rapid shuffling of the taxonomic and functional profile of the pelagic bacterial community, resulting in a significant enrichment of protein/amino acid catabolism-related enzymes in the jelly-OM degrading community dominated by Pseudoalteromonadaceae, Alteromonadaceae and Vibrionaceae, compared to unamended control treatments. In accordance with the proteinaceous character of jelly-OM, Pseudoalteromonadaceae synthesized and excreted enzymes associated with proteolysis, while Alteromonadaceae contributed to extracellular hydrolysis of complex carbohydrates and organophosphorus compounds. In contrast, Vibrionaceae synthesized transporter proteins for peptides, amino acids and carbohydrates, exhibiting a cheater-type lifestyle, i.e. benefiting from public goods released by others. In the late stage of jelly-OM degradation, Rhodobacteraceae and Alteromonadaceae became dominant, growing on jelly-OM left-overs or bacterial debris, potentially contributing to the accumulation of dissolved organic nitrogen compounds and inorganic nutrients, following the decay of jellyfish blooms. CONCLUSIONS Our findings indicate that specific chemical and metabolic fingerprints associated with decaying jellyfish blooms are substantially different to those previously associated with decaying phytoplankton blooms, potentially altering the functioning and biogeochemistry of marine systems. We show that decaying jellyfish blooms are associated with the enrichment in extracellular collagenolytic bacterial proteases, which could act as virulence factors in human and marine organisms' disease, with possible implications for marine ecosystem services. Our study also provides novel insights into niche partitioning and metabolic interactions among key jelly-OM degraders operating a complex metabolic network in a temporal cascade of biochemical reactions to degrade pulses of jellyfish-bloom-specific compounds in the water column. Video Abstract.
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Affiliation(s)
- Tinkara Tinta
- Marine Biology Station Piran, National Institute of Biology, Piran, Slovenia.
- Department of Functional and Evolutionary Ecology, Bio-Oceanography and Marine Biology Unit, University of Vienna, Vienna, Austria.
| | - Zihao Zhao
- Department of Functional and Evolutionary Ecology, Bio-Oceanography and Marine Biology Unit, University of Vienna, Vienna, Austria
| | - Barbara Bayer
- Department of Microbiology and Ecosystem Science, Centre for Microbiology and Environmental Systems Science, University of Vienna, Vienna, Austria
| | - Gerhard J Herndl
- Department of Functional and Evolutionary Ecology, Bio-Oceanography and Marine Biology Unit, University of Vienna, Vienna, Austria
- NIOZ, Department of Marine Microbiology and Biogeochemistry, Royal Netherlands Institute for Sea Research, Utrecht University, Den Burg, The Netherlands
- Vienna Metabolomics & Proteomics Center, University of Vienna, Vienna, Austria
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Maracani A, Pastore VP, Natale L, Rosasco L, Odone F. In-domain versus out-of-domain transfer learning in plankton image classification. Sci Rep 2023; 13:10443. [PMID: 37369770 DOI: 10.1038/s41598-023-37627-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 06/24/2023] [Indexed: 06/29/2023] Open
Abstract
Plankton microorganisms play a huge role in the aquatic food web. Recently, it has been proposed to use plankton as a biosensor, since they can react to even minimal perturbations of the aquatic environment with specific physiological changes, which may lead to alterations in morphology and behavior. Nowadays, the development of high-resolution in-situ automatic acquisition systems allows the research community to obtain a large amount of plankton image data. Fundamental examples are the ZooScan and Woods Hole Oceanographic Institution (WHOI) datasets, comprising up to millions of plankton images. However, obtaining unbiased annotations is expensive both in terms of time and resources, and in-situ acquired datasets generally suffer from severe imbalance, with only a few images available for several species. Transfer learning is a popular solution to these challenges, with ImageNet1K being the most-used source dataset for pre-training. On the other hand, datasets like the ZooScan and the WHOI may represent a valuable opportunity to compare out-of-domain and large-scale plankton in-domain source datasets, in terms of performance for the task at hand.In this paper, we design three transfer learning pipelines for plankton image classification, with the aim of comparing in-domain and out-of-domain transfer learning on three popular benchmark plankton datasets. The general framework consists in fine-tuning a pre-trained model on a plankton target dataset. In the first pipeline, the model is pre-trained from scratch on a large-scale plankton dataset, in the second, it is pre-trained on large-scale natural image datasets (ImageNet1K or ImageNet22K), while in the third, a two-stage fine-tuning is implemented (ImageNet [Formula: see text] large-scale plankton dataset [Formula: see text] target plankton dataset). Our results show that an out-of-domain ImageNet22K pre-training outperforms the plankton in-domain ones, with an average boost in test accuracy of around 6%. In the next part of this work, we adopt three ImageNet22k pre-trained Vision Transformers and one ConvNeXt, obtaining results on par (or slightly superior) with the state-of-the-art, corresponding to the usage of CNN models ensembles, with a single model. Finally, we design and test an ensemble of our Vision Transformers and the ConvNeXt, outperforming the state-of-the-art existing works on plankton image classification on the three target datasets. To support scientific community contribution and further research, our implemented code is open-source and available at https://github.com/Malga-Vision/plankton_transfer .
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Affiliation(s)
- Andrea Maracani
- Istituto Italiano di Tecnologia, Genoa, Italy
- MaLGa-DIBRIS, Università degli studi di Genova, Genoa, Italy
| | | | | | - Lorenzo Rosasco
- Istituto Italiano di Tecnologia, Genoa, Italy
- MaLGa-DIBRIS, Università degli studi di Genova, Genoa, Italy
- CBMM, Massachusetts Institute of Technology, Massachusetts, CA, USA
| | - Francesca Odone
- MaLGa-DIBRIS, Università degli studi di Genova, Genoa, Italy
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Mos B, Mesic N, Dworjanyn SA. Variable food alters responses of larval crown-of-thorns starfish to ocean warming but not acidification. Commun Biol 2023; 6:639. [PMID: 37316528 DOI: 10.1038/s42003-023-05028-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 06/08/2023] [Indexed: 06/16/2023] Open
Abstract
Phytoplankton abundance is decreasing and becoming more variable as the ocean climate changes. We examine how low, high, and variable phytoplankton food supply affected the survival, development, and growth of larval crown-of-thorns starfish, Acanthaster sp. exposed to combined warming (26, 30 °C) and acidification (pH 8.0, 7.6). Larvae fed a low food ration are smaller, and develop slower and with more abnormalities than larvae fed a high ration. Larvae fed a variable food supply (low, followed by high ration) overcome the negative effects of low food on development rate and occurrence of abnormalities, but are 16-17% smaller than larvae fed the high ration continuously. Acidification (pH 7.6) slows growth and development and increases abnormalities regardless of the food regime. Warming slows growth and development, but these effects are mitigated by high food availability. As tropical oceans warm, the success of crown-of-thorns starfish larvae may depend on the abundance of their phytoplankton prey.
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Affiliation(s)
- Benjamin Mos
- Moreton Bay Research Station (MBRS), School of Biological Sciences, The University of Queensland, 37 Fraser Street, Dunwich, Minjerribah, QLD 4183, Australia.
- Centre for Marine Science (CMS), The University of Queensland, Brisbane, QLD, 4072, Australia.
| | - Naomi Mesic
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, PO Box 4321, Coffs Harbour, NSW, 2450, Australia
| | - Symon A Dworjanyn
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, PO Box 4321, Coffs Harbour, NSW, 2450, Australia
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Mesquita AF, Jesus F, Gonçalves FJM, Gonçalves AMM. Ecotoxicological and biochemical effects of a binary mixture of pesticides on the marine diatom Thalassiosira weissflogii in a scenario of global warming. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 876:162737. [PMID: 36907391 DOI: 10.1016/j.scitotenv.2023.162737] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 02/20/2023] [Accepted: 03/05/2023] [Indexed: 06/18/2023]
Abstract
Under the current scenario of global warming, it is ecologically relevant to understand how increased temperature influences the combined toxicity of pesticides to aquatic species. Hence, this work aims to: a) determine the temperature effect (15 °C, 20 °C and 25 °C) on the toxicity of two pesticides (oxyfluorfen and Copper (Cu)), on the growth of Thalassiosira weissflogii; b) assess whether temperature affects the type of toxicity interaction between these chemicals; and c) assess the temperature effect on biochemical responses (fatty acids (FA) and sugar profiles) of the pesticides on T. weissflogii. Temperature increased the tolerance of the diatoms to the pesticides with EC50 values between 3.176 and 9.929 μg L-1 for oxyfluorfen and 42.50-230.75 μg L-1 for Cu, respectively, at 15 °C and 25 °C. The mixtures toxicity was better described by the IA model, but temperature altered the type of deviation from dose ratio (15 °C and 20 °C) to antagonism (25 °C). Temperature, as well as the pesticide concentrations, affected the FA and sugar profiles. Increased temperature increased saturated FA and decreased unsaturated FA; it also affected the sugar profiles with a pronounced minimum at 20 °C. Results highlight effects on the nutritional value of these diatoms, with potential repercussion on food webs.
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Affiliation(s)
- Andreia F Mesquita
- CESAM - Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Fátima Jesus
- CESAM - Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Fernando J M Gonçalves
- CESAM - Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Ana M M Gonçalves
- CESAM - Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal; University of Coimbra, MARE-Marine and Environmental Sciences Centre/ARNET - Aquatic Research Network, Department of Life Sciences, Calçada Martim de Freitas, 3000-456 Coimbra, Portugal
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Chen H, Barton S, Yang M, Rickaby REM, Bouman HA, Compton RG. AI facilitated fluoro-electrochemical phytoplankton classification. Chem Sci 2023; 14:5872-5879. [PMID: 37293636 PMCID: PMC10246652 DOI: 10.1039/d3sc01741a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 05/02/2023] [Indexed: 06/10/2023] Open
Abstract
Marine phytoplankton is extremely diverse. Counting and characterising phytoplankton is essential for understanding climate change and ocean health not least since phytoplankton extensively biomineralize carbon dioxide whilst generating 50% of the planet's oxygen. We report the use of fluoro-electrochemical microscopy to distinguish different taxonomies of phytoplankton by the quenching of their chlorophyll-a fluorescence using chemical species oxidatively electrogenerated in situ in seawater. The rate of chlorophyll-a quenching of each cell is characteristic of the species-specific structural composition and cellular content. But with increasing diversity and extent of phytoplankton species under study, human interpretation and distinction of the resulting fluorescence transients becomes increasingly and prohibitively difficult. Thus, we further report a neural network to analyse these fluorescence transients, with an accuracy >95% classifying 29 phytoplankton strains to their taxonomic orders. This method transcends the state-of-the-art. The success of the fluoro-electrochemical microscopy combined with AI provides a novel, flexible and highly granular solution to phytoplankton classification and is adaptable for autonomous ocean monitoring.
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Affiliation(s)
- Haotian Chen
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford South Parks Road Oxford OX1 3QZ UK
| | - Samuel Barton
- Department of Earth Sciences, University of Oxford South Parks Road Oxford OX1 3AN UK
| | - Minjun Yang
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford South Parks Road Oxford OX1 3QZ UK
| | - Rosalind E M Rickaby
- Department of Earth Sciences, University of Oxford South Parks Road Oxford OX1 3AN UK
| | - Heather A Bouman
- Department of Earth Sciences, University of Oxford South Parks Road Oxford OX1 3AN UK
| | - Richard G Compton
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford South Parks Road Oxford OX1 3QZ UK
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39
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Letessier TB, Mannocci L, Goodwin B, Embling C, de Vos A, Anderson RC, Ingram SN, Rogan A, Turvey ST. Contrasting ecological information content in whaling archives with modern cetacean surveys for conservation planning and identification of historical distribution changes. CONSERVATION BIOLOGY : THE JOURNAL OF THE SOCIETY FOR CONSERVATION BIOLOGY 2023; 37:e14043. [PMID: 36756799 DOI: 10.1111/cobi.14043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 10/02/2022] [Accepted: 11/21/2022] [Indexed: 05/30/2023]
Abstract
Many species are restricted to a marginal or suboptimal fraction of their historical range due to anthropogenic impacts, making it hard to interpret their ecological preferences from modern-day data alone. However, inferring past ecological states is limited by the availability of robust data and biases in historical archives, posing a challenge for policy makers . To highlight how historical records can be used to understand the ecological requirements of threatened species and inform conservation, we investigated sperm whale (Physeter macrocephalus) distribution in the Western Indian Ocean. We assessed differences in information content and habitat suitability predictions based on whale occurrence data from Yankee whaling logs (1792-1912) and from modern cetacean surveys (1995-2020). We built maximum entropy habitat suitability models containing static (bathymetry-derived) variables to compare models comprising historical-only and modern-only data. Using both historical and modern habitat suitability predictions we assessed marine protected area (MPA) placement by contrasting suitability in- and outside MPAs. The historical model predicted high habitat suitability in shelf and coastal regions near continents and islands, whereas the modern model predicted a less coastal distribution with high habitat suitability more restricted to areas of steep topography. The proportion of high habitat suitability inside versus outside MPAs was higher when applying the historical predictions than the modern predictions, suggesting that different marine spatial planning optimums can be reached from either data sources. Moreover, differences in relative habitat suitability predictions between eras were consistent with the historical depletion of sperm whales from coastal regions, which were easily accessed and targeted by whalers, resulting in a modern distribution limited more to steep continental margins and remote oceanic ridges. The use of historical data can provide important new insights and, through cautious interpretation, inform conservation planning and policy, for example, by identifying refugee species and regions of anticipated population recovery.
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Affiliation(s)
- Tom B Letessier
- FRB-CESAB, Montpellier, France
- Institute of Zoology, Zoological Society of London, London, UK
- School of Biological Sciences, University of Western Australia, Perth, Western Australia, Australia
| | - Laura Mannocci
- FRB-CESAB, Montpellier, France
- MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Montpellier, France
| | - Brittney Goodwin
- Institute of Zoology, Zoological Society of London, London, UK
- Royal Veterinary College, London, UK
| | - Clare Embling
- School of Biological and Marine Sciences, University of Plymouth, Plymouth, UK
| | - Asha de Vos
- School of Biological Sciences, University of Western Australia, Perth, Western Australia, Australia
- Oceanswell, Colombo, Sri Lanka
| | | | - Simon N Ingram
- School of Biological and Marine Sciences, University of Plymouth, Plymouth, UK
| | - Andy Rogan
- Ocean Alliance, Gloucester, Massachusetts, USA
| | - Samuel T Turvey
- Institute of Zoology, Zoological Society of London, London, UK
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40
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Zhang Y, Bai Y, He X, Li T, Jiang Z, Gong F. Three stages in the variation of the depth of hypoxia in the California Current System 2003-2020 by satellite estimation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 874:162398. [PMID: 36848994 DOI: 10.1016/j.scitotenv.2023.162398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 01/26/2023] [Accepted: 02/18/2023] [Indexed: 06/18/2023]
Abstract
The depth of hypoxia (DOH) is the shallowest depth at which the waters become hypoxic (oxygen concentration < 60 μmol kg-1), is a crucial indicator of the formation and expansion of oxygen minimum zones (OMZs). In this study, a nonlinear polynomial regression inversion model was developed to estimate the DOH in the California Current System (CCS), based on the dissolved oxygen profile detected by the Biogeochemical-Argo (BGC-Argo) float and remote sensing data. Satellite-derived net community production was used in the algorithm development, to denote the combined effect of phytoplankton photosynthesis and O2 consumption. Our model performs well, with a coefficient of determination of 0.82 and a root mean square error of 37.69 m (n = 80) from November 2012 to August 2016. Then, it was used to reconstruct the variation in satellite-derived DOH in the CCS from 2003 to 2020, and three stages of the DOH variation trend were identified. From 2003 to 2013, the DOH showed a significant shallowing trend due to the intense subsurface O2 consumption caused by strong phytoplankton production in the CCS coastal region. The trend was interrupted by two successive strong climate oscillation events from 2014 to 2016, which led to a significant deepening of the DOH and a slowing, or even reversal, of the variations in other environmental parameters. After 2017, the effects of climate oscillation events gradually disappeared, and the shallowing pattern in the DOH recovered slightly. However, by 2020, the DOH had not returned to the pre-2014 shallowing characteristic, which would lead to continuing complex ecosystem responses in the context of global warming. Based on the satellite inversion model of DOH in the CCS, we provide a new insight on the high-resolution spatiotemporal OMZ variations during an 18-year period in the CCS, which will aid in the evaluation and prediction of local ecosystems variation.
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Affiliation(s)
- Yifan Zhang
- School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
| | - Yan Bai
- School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China.
| | - Xianqiang He
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China; Donghai laboratory, Zhoushan, Zhejiang 316021, China
| | - Teng Li
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China; Donghai laboratory, Zhoushan, Zhejiang 316021, China
| | - Zhiting Jiang
- School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
| | - Fang Gong
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China; Donghai laboratory, Zhoushan, Zhejiang 316021, China
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41
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Novotny A, Serandour B, Kortsch S, Gauzens B, Jan KMG, Winder M. DNA metabarcoding highlights cyanobacteria as the main source of primary production in a pelagic food web model. SCIENCE ADVANCES 2023; 9:eadg1096. [PMID: 37126549 PMCID: PMC10132751 DOI: 10.1126/sciadv.adg1096] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Models that estimate rates of energy flow in complex food webs often fail to account for species-specific prey selectivity of diverse consumer guilds. While DNA metabarcoding is increasingly used for dietary studies, methodological biases have limited its application for food web modeling. Here, we used data from dietary metabarcoding studies of zooplankton to calculate prey selectivity indices and assess energy fluxes in a pelagic resource-consumer network. We show that food web dynamics are influenced by prey selectivity and temporal match-mismatch in growth cycles and that cyanobacteria are the main source of primary production in the investigated coastal pelagic food web. The latter challenges the common assumption that cyanobacteria are not supporting food web productivity, a result that is increasingly relevant as global warming promotes cyanobacteria dominance. While this study provides a method for how DNA metabarcoding can be used to quantify energy fluxes in a marine food web, the approach presented here can easily be extended to other ecosystems.
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Affiliation(s)
- Andreas Novotny
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - Baptiste Serandour
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - Susanne Kortsch
- Spatial Foodweb Ecology Group, Department of Agricultural Sciences, University of Helsinki, Helsinki, Finland
- Environmental and Marine Biology, Åbo Akademi University, Turku 20500, Finland
| | - Benoit Gauzens
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- Institute of Biodiversity, Friedrich Schiller University, Jena, Germany
| | - Kinlan M G Jan
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - Monika Winder
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
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42
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Crichton KA, Wilson JD, Ridgwell A, Boscolo-Galazzo F, John EH, Wade BS, Pearson PN. What the geological past can tell us about the future of the ocean's twilight zone. Nat Commun 2023; 14:2376. [PMID: 37105972 PMCID: PMC10140295 DOI: 10.1038/s41467-023-37781-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 03/30/2023] [Indexed: 04/29/2023] Open
Abstract
Paleontological reconstructions of plankton community structure during warm periods of the Cenozoic (last 66 million years) reveal that deep-dwelling 'twilight zone' (200-1000 m) plankton were less abundant and diverse, and lived much closer to the surface, than in colder, more recent climates. We suggest that this is a consequence of temperature's role in controlling the rate that sinking organic matter is broken down and metabolized by bacteria, a process that occurs faster at warmer temperatures. In a warmer ocean, a smaller fraction of organic matter reaches the ocean interior, affecting food supply and dissolved oxygen availability at depth. Using an Earth system model that has been evaluated against paleo observations, we illustrate how anthropogenic warming may impact future carbon cycling and twilight zone ecology. Our findings suggest that significant changes are already underway, and without strong emissions mitigation, widespread ecological disruption in the twilight zone is likely by 2100, with effects spanning millennia thereafter.
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Affiliation(s)
- Katherine A Crichton
- School of Earth and Environmental Science, Cardiff University, Cardiff, UK.
- Now at Department of Geography, University of Exeter, Exeter, UK.
| | - Jamie D Wilson
- School of Earth Sciences, University of Bristol, Bristol, UK
- Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, UK
| | - Andy Ridgwell
- Department of Earth and Planetary Sciences, University of California, Riverside, CA, USA
| | - Flavia Boscolo-Galazzo
- School of Earth and Environmental Science, Cardiff University, Cardiff, UK
- Now at MARUM, University of Bremen, Bremen, Germany
| | - Eleanor H John
- School of Earth and Environmental Science, Cardiff University, Cardiff, UK
| | - Bridget S Wade
- Department of Earth Sciences, University College London, London, UK
| | - Paul N Pearson
- School of Earth and Environmental Science, Cardiff University, Cardiff, UK
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43
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Holderman NR, Ferrer-González FX, Glushka J, Moran MA, Edison AS. Dissolved organic metabolite extraction from high-salt media. NMR IN BIOMEDICINE 2023; 36:e4797. [PMID: 35799308 DOI: 10.1002/nbm.4797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 06/13/2022] [Accepted: 07/01/2022] [Indexed: 06/15/2023]
Abstract
We describe considerations and strategies for developing a nuclear magnetic resonance (NMR) sample preparation method to extract low molecular weight metabolites from high-salt spent media in a model coculture system of phytoplankton and marine bacteria. Phytoplankton perform half the carbon fixation and oxygen generation on Earth. A substantial fraction of fixed carbon becomes part of a metabolite pool of small molecules known as dissolved organic matter (DOM), which are taken up by marine bacteria proximate to phytoplankton. There is an urgent need to elucidate these metabolic exchanges due to widespread anthropogenic transformations on the chemical, phenotypic, and species composition of seawater. These changes are increasing water temperature and the amount of CO2 absorbed by the ocean at energetic costs to marine microorganisms. Little is known about the metabolite-mediated, structured interactions occurring between phytoplankton and associated marine bacteria, in part because of challenges in studying high-salt solutions on various analytical platforms. NMR analysis is problematic due to the high-salt content of both natural seawater and culture media for marine microbes. High-salt concentration degrades the performance of the radio frequency coil, reduces the efficiency of some pulse sequences, limits signal-to-noise, and prolongs experimental time. The method described herein can reproducibly extract low molecular weight DOM from small-volume, high-salt cultures. It is a promising tool for elucidating metabolic flux between marine microorganisms and facilitates genetic screens of mutant microorganisms.
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Affiliation(s)
- Nicole R Holderman
- Department of Biochemistry and Molecular Biology and Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | | | - John Glushka
- Department of Biochemistry and Molecular Biology and Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Mary Ann Moran
- Department of Marine Sciences, University of Georgia, Athens, Georgia, USA
| | - Arthur S Edison
- Department of Biochemistry and Molecular Biology and Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
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44
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Zhou Y, He Y, Guo X, Dai J, Lai X, Hong B, Chen B, Wang M. Pilot-scale remediation of rare earth elements ammonium wastewater by Chlamydomonas sp. YC in summer under outdoor conditions. BIORESOURCE TECHNOLOGY 2023; 372:128674. [PMID: 36702323 DOI: 10.1016/j.biortech.2023.128674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 01/18/2023] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
This work evaluated the performance of real rare earth elements (REEs) wastewater purification and carbon dioxide (CO2) fixation by Chlamydomonas sp. YC with pilot-scale airlift-photobioreactors (AL-PBRs), tubular photobioreactors (TB-PBRs) and raceway ponds (ORWPs) under high-temperature outdoor conditions in summer. The obtained results showed that Chlamydomonas sp. YC at 1 g/L oyster shell piece (OSP) and 3 % CO2 had the highest biomass (1.9 g/L) and NH4+-N removal efficiency (34.0 %) during the REEs wastewater treatment. Among the selected photobioreactors, Chlamydomonas sp. YC to treat real REEs wastewater at 3 % CO2 under high-temperature outdoor conditions attained the highest biomass (2.3 g/L) in the TB-PBRs with the best NH4+-N removal efficiency (43.0 %). Furthermore, the input cost and CO2 net sequestration evaluation revealed that TB-PBRs was more economical photobioreactors to treat REEs wastewater and fix CO2 by Chlamydomonas sp. YC, providing some vital scientific details for REEs wastewater and CO2 fixation by microalgal biotechnology.
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Affiliation(s)
- Youcai Zhou
- College of Life Science, Fujian Normal University, Fuzhou 350117, China
| | - Yongjin He
- College of Life Science, Fujian Normal University, Fuzhou 350117, China; Engineering Research Center of Industrial Microbiology, Ministry of Education, Fujian Normal University, Fuzhou 350117, China
| | - Xu Guo
- College of Life Science, Fujian Normal University, Fuzhou 350117, China
| | - Jingxuan Dai
- College of Life Science, Fujian Normal University, Fuzhou 350117, China
| | - Xiaobin Lai
- Longyan Rare Earth Development CO., LTD, China
| | - Bengen Hong
- Longyan Rare Earth Development CO., LTD, China
| | - Bilian Chen
- College of Life Science, Fujian Normal University, Fuzhou 350117, China; Engineering Research Center of Industrial Microbiology, Ministry of Education, Fujian Normal University, Fuzhou 350117, China
| | - Mingzi Wang
- College of Life Science, Fujian Normal University, Fuzhou 350117, China; Engineering Research Center of Industrial Microbiology, Ministry of Education, Fujian Normal University, Fuzhou 350117, China.
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45
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Gsell AS, Biere A, de Boer W, de Bruijn I, Eichhorn G, Frenken T, Geisen S, van der Jeugd H, Mason-Jones K, Meisner A, Thakur MP, van Donk E, Zwart MP, Van de Waal DB. Environmental refuges from disease in host-parasite interactions under global change. Ecology 2023; 104:e4001. [PMID: 36799146 DOI: 10.1002/ecy.4001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/04/2022] [Accepted: 12/08/2022] [Indexed: 02/18/2023]
Abstract
The physiological performance of organisms depends on their environmental context, resulting in performance-response curves along environmental gradients. Parasite performance-response curves are generally expected to be broader than those of their hosts due to shorter generation times and hence faster adaptation. However, certain environmental conditions may limit parasite performance more than that of the host, thereby providing an environmental refuge from disease. Thermal disease refuges have been extensively studied in response to climate warming, but other environmental factors may also provide environmental disease refuges which, in turn, respond to global change. Here, we (1) showcase laboratory and natural examples of refuges from parasites along various environmental gradients, and (2) provide hypotheses on how global environmental change may affect these refuges. We strive to synthesize knowledge on potential environmental disease refuges along different environmental gradients including salinity and nutrients, in both natural and food-production systems. Although scaling up from single host-parasite relationships along one environmental gradient to their interaction outcome in the full complexity of natural environments remains difficult, integrating host and parasite performance-response can serve to formulate testable hypotheses about the variability in parasitism outcomes and the occurrence of environmental disease refuges under current and future environmental conditions.
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Affiliation(s)
- Alena S Gsell
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Ecosystem Research Department, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany
| | - Arjen Biere
- Department of Terrestrial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
| | - Wietse de Boer
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Soil Biology Group, Wageningen University & Research, Wageningen, The Netherlands
| | - Irene de Bruijn
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Koppert, Berkel en Rodenrijs, The Netherlands
| | - Götz Eichhorn
- Department of Animal Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Centre for Avian Migration and Demography, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
| | - Thijs Frenken
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Great Lakes Institute for Environmental Research (GLIER), University of Windsor, Windsor, Ontario, Canada
| | - Stefan Geisen
- Department of Terrestrial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Department of Nematology, Wageningen University and Research, Wageningen, The Netherlands
| | - Henk van der Jeugd
- Department of Animal Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Centre for Avian Migration and Demography, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
| | - Kyle Mason-Jones
- Department of Terrestrial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
| | - Annelein Meisner
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Wageningen University & Research, Wageningen Research, Wageningen, The Netherlands.,Microbial Ecology Group, Department of Biology, Lund University, Lund, Sweden
| | - Madhav P Thakur
- Department of Terrestrial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Terrestrial Ecology Group, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland
| | - Ellen van Donk
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
| | - Mark P Zwart
- Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
| | - Dedmer B Van de Waal
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands.,Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands
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46
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Zhang J, Wang Y, Ottmann D, Cao P, Yang J, Yu J, Lv Z. Seasonal variability of phytoplankton community response to thermal discharge from nuclear power plant in temperate coastal area. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 318:120898. [PMID: 36539008 DOI: 10.1016/j.envpol.2022.120898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/30/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Nuclear power plants (NPPs) developed rapidly worldwide in the last half-century and have become one of the most important electric power sources. Thermal discharge from NPPs increases the temperature of receiving waters, directly and indirectly affecting phytoplankton community. Seasonal and interannual variation in environmental factors in temperate areas makes it challenging to determine the effects of thermal effluents from NPPs on coastal phytoplankton. Here, a five-year study was performed around a NPP in the western Yellow Sea to determine how thermal effluents affect phytoplankton community during different seasons. A total of 106 phytoplankton species from 7 phyla were identified in 10 biological sites during the 19 cruises, among which diatoms dominated phytoplankton abundance in all seasons. Our results show that increased seawater temperature caused by thermal effluents (1) was not enough to cause a statistically significant effect on phytoplankton abundance composition from autumn through spring, (2) significantly stimulated phytoplankton population growth and changed phytoplankton composition in summer (3) increased the proportion of diatoms and decreased the proportion of dinoflagellate in summer, and (4) increased the abundance and dominance of Skeletonema costatum sensu lato, especially in summer. The findings of this study provide essential information on the ecological impact of thermal effluents from NPPs in temperate coastal areas.
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Affiliation(s)
- Jingjing Zhang
- The Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, 264025, Shandong, PR China; Centre for Ocean Life, DTU Aqua, Technical University of Denmark, Lyngby, 2800, Denmark
| | - Yibin Wang
- First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, Shandong, PR China.
| | - Daniel Ottmann
- Centre for Ocean Life, DTU Aqua, Technical University of Denmark, Lyngby, 2800, Denmark
| | - Peng Cao
- Yantai Customs Technology Center, Yantai, 264025, Shandong, PR China
| | - Jisong Yang
- The Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, 264025, Shandong, PR China
| | - Junbao Yu
- The Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, 264025, Shandong, PR China
| | - Zhenbo Lv
- The Institute for Advanced Study of Coastal Ecology, Ludong University, Yantai, 264025, Shandong, PR China
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47
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Thoral E, Roussel D, Gasset E, Dutto G, Queiros Q, McKenzie DJ, Bourdeix JH, Metral L, Saraux C, Teulier L. Temperature-dependent metabolic consequences of food deprivation in the European sardine. J Exp Biol 2023; 226:286277. [PMID: 36621833 DOI: 10.1242/jeb.244984] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 12/23/2022] [Indexed: 01/10/2023]
Abstract
Aquatic ecosystems can exhibit seasonal variation in resource availability and animals have evolved to cope with the associated caloric restriction. During winter in the NW Mediterranean Sea, the European sardine Sardina pilchardus naturally experiences caloric restriction owing to a decrease in the diversity and quantity of plankton. However, ongoing global warming has had deleterious effects on plankton communities such that food shortages may occur throughout the year, especially under warm conditions in the summer. We investigated the interactive effects of temperature and food availability on sardine metabolism by continuously monitoring whole-animal respiration of groups of control (fed) and food-deprived sardines over a 60-day experiment in winter (12°C) or summer (20°C) conditions under natural photoperiod. In addition, we measured mitochondrial respiration of red muscle fibres, biometric variables and energy reserves of individuals sampled at 30 and 60 days. This revealed that winter food deprivation elicits energy saving mechanisms at whole animal and cellular levels by maintaining a low metabolism to preserve energy reserves, allowing high levels of survival. By contrast, despite energy saving mechanisms at the mitochondrial level, whole animal metabolic rate was high during food deprivation in summer, causing increased consumption of energy reserves at the muscular level and high mortality after 60 days. Furthermore, a 5-day re-feeding did not improve survival, and mortalities continued, suggesting that long-term food deprivation at high temperatures causes profound stress in sardines that potentially impairs nutrient absorption.
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Affiliation(s)
- Elisa Thoral
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69622, Villeurbanne, France
| | - Damien Roussel
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69622, Villeurbanne, France
| | - Eric Gasset
- MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, chemin de Maguelonne, 34250 Palavas-les-Flots, France
| | - Gilbert Dutto
- MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, chemin de Maguelonne, 34250 Palavas-les-Flots, France
| | - Quentin Queiros
- MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, Avenue Jean Monnet, 34203 Sète Cedex, France.,DECOD (Ecosystem Dynamics and Sustainability), INRAE, Institut Agro, IFREMER, 35042 Rennes, France
| | - David J McKenzie
- MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, Place Eugène Bataillon, 34095 Montpellier, France
| | - Jean-Hervé Bourdeix
- MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, Avenue Jean Monnet, 34203 Sète Cedex, France
| | - Luisa Metral
- MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, Avenue Jean Monnet, 34203 Sète Cedex, France
| | - Claire Saraux
- MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, Avenue Jean Monnet, 34203 Sète Cedex, France.,IPHC, UMR7178, Université de Strasbourg, CNRS, 67000 Strasbourg, France
| | - Loïc Teulier
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, ENTPE, UMR 5023 LEHNA, F-69622, Villeurbanne, France
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48
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Díaz-Sánchez LM, Blanco-Tirado C, Combariza MY. Electron-transfer MALDI MS methodology for microalgae/phytoplankton pigments analysis. MethodsX 2023; 10:102140. [PMID: 37007620 PMCID: PMC10050785 DOI: 10.1016/j.mex.2023.102140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Accepted: 03/15/2023] [Indexed: 04/04/2023] Open
Abstract
The method describes pigment analysis from microalgae/phytoplankton extracts using electron-transfer Matrix-Assisted Laser Desorption Ionization Mass Spectrometry (ET MALDI MS). Current microalgae/phytoplankton pigment analysis requires resource- and time-intensive chromatographic methods due to the broad polarity range of the target analytes. On the other hand, traditional MALDI MS chlorophyll analysis, using proton-transfer matrices such as 2,5-dihydroxybenzoic acid (DHB) or α-cyano-4-hydroxycinnamic acid (CHCA), results in central metal loss and phytol-ester cleavage. ET MALDI MS is an alternative for the rapid screening and detection of pigments in microalgae extracts.•MALDI matrices with ionization energies above 8.0 eV guarantee electron-transfer processes from photosynthetic and photoprotective pigments whose ionization energies lay below 7.5 eV.•ET MALDI MS pigment analysis agrees with data gathered from conventional chromatographic techniques (HPLC) and optical microscopy for pigment extracts from C. vulgaris cultures and freshwater phytoplankton samples.•The ET MALDI MS method allows fast and reliable detection of pigments in microalgae cultures and freshwater phytoplankton samples.
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Liu L, Fan M, Kang Y. Effect of nutrient supply on cell size evolution of marine phytoplankton. MATHEMATICAL BIOSCIENCES AND ENGINEERING : MBE 2023; 20:4714-4740. [PMID: 36896519 DOI: 10.3934/mbe.2023218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The variation of nutrient supply not only leads to the differences in the phytoplankton biomass and primary productivity but also induces the long-term phenotypic evolution of phytoplankton. It is widely accepted that marine phytoplankton follows Bergmann's Rule and becomes smaller with climate warming. Compared with the direct effect of increasing temperature, the indirect effect via nutrient supply is considered to be an important and dominant factor in the reduction of phytoplankton cell size. In this paper, a size-dependent nutrient-phytoplankton model is developed to explore the effects of nutrient supply on the evolutionary dynamics of functional traits associated with phytoplankton size. The ecological reproductive index is introduced to investigate the impacts of input nitrogen concentration and vertical mixing rate on the persistence of phytoplankton and the distribution of cell size. In addition, by applying the adaptive dynamics theory, we study the relationship between nutrient input and the evolutionary dynamics of phytoplankton. The results show that input nitrogen concentration and vertical mixing rate have significant effects on the cell size evolution of phytoplankton. Specifically, cell size tends to increase with the input nutrient concentration, as does the diversity of cell sizes. In addition, a single-peaked relationship between vertical mixing rate and cell size is observed. When the vertical mixing rate is too low or too high, only small individuals are dominant in the water column. When the vertical mixing rate is moderate, large individuals can coexist with small individuals, so the diversity of phytoplankton is elevated. We predict that reduced intensity of nutrient input due to climate warming will lead to a trend towards smaller cell size and will reduce the diversity of phytoplankton.
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Affiliation(s)
- Lidan Liu
- School of Mathematics and Statistics, Northeast Normal University, Changchun, Jilin 130024, China
| | - Meng Fan
- School of Mathematics and Statistics, Northeast Normal University, Changchun, Jilin 130024, China
| | - Yun Kang
- College of Integrative Sciences and Arts, Arizona State University, Mesa, AZ 85212, USA
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50
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Han Y, Zhou Y. Investigating biophysical control of marine phytoplankton dynamics via Bayesian mechanistic modeling. Ecol Modell 2022. [DOI: 10.1016/j.ecolmodel.2022.110168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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