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He H, Liu Z, Li D, Liu X, Han Y, Sun H, Zhao M, Shao M, Shi L, Hao P, Lai C. Effects of carbon limitation and carbon fertilization on karst lake-reservoir productivity. WATER RESEARCH 2024; 261:122036. [PMID: 38981350 DOI: 10.1016/j.watres.2024.122036] [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: 04/07/2024] [Revised: 06/11/2024] [Accepted: 07/01/2024] [Indexed: 07/11/2024]
Abstract
Nitrogen and phosphorus are universally recognized as limiting elements in the eutrophication processes affecting the majority of the world's lakes, reservoirs, and coastal ecosystems. However, despite extensive research spanning several decades, critical questions in eutrophication science remain unanswered. For example, there is still much to understand about the interactions between carbon limitation and ecosystem stability, and the availability of carbon components adds significant complexity to aquatic resource management. Mounting evidence suggests that aqueous CO2 could be a limiting factor, influencing the structure and succession of aquatic plant communities, especially in karstic lake and reservoir ecosystems. Moreover, the fertilization effect of aqueous CO2 has the potential to enhance carbon sequestration and phosphorus removal. Therefore, it is important to address these uncertainties to achieve multiple positive outcomes, including improved water quality and increased carbon sinks in karst lakes and reservoirs.
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Affiliation(s)
- Haibo He
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China
| | - Zaihua Liu
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an 710061, China.
| | - Dongli Li
- Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China
| | - Xing Liu
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yongqiang Han
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hailong Sun
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China
| | - Min Zhao
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China
| | - Mingyu Shao
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China
| | - Liangxing Shi
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Pengyun Hao
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chaowei Lai
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (CAS), Guiyang 550081, China
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2
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Alam MS, Wong KH, Ishikawa A, Li M, Zai Y, Papry RI, Mashio AS, Rahman IMM, Hasegawa H. Exploring phosphate impact on arsenate uptake and distribution in freshwater phytoplankton: Insights from single-cell ICP-MS. CHEMOSPHERE 2024; 364:143129. [PMID: 39159762 DOI: 10.1016/j.chemosphere.2024.143129] [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: 05/03/2024] [Revised: 08/04/2024] [Accepted: 08/17/2024] [Indexed: 08/21/2024]
Abstract
In this study, we investigated the interaction between arsenate (AsV) and phosphate (PO43-) in freshwater phytoplankton using single-cell inductively coupled plasma mass spectrometry (SC-ICP-MS). This study aimed to elucidate the influence of varying PO43- concentrations on arsenic (As) uptake and distribution at the single-cell level, providing insights into intraspecies diversity. Two species of freshwater phytoplanktons, Scenedesmus acutus and Pediastrum duplex, were cultured under different concentrations of PO43- and AsV in a controlled laboratory environment. Scenedesmus acutus, a species with strong salt tolerance, and Pediastrum duplex, known for its weak salt tolerance, were selected based on their contrasting behaviors in previous studies. SC-ICP-MS revealed non-uniform uptake of As by individual phytoplankton cells, with distinct variations in response to PO43- availability. Arsenic uptake by both species declined with a high PO43- level after 7 days of exposure. However, after 14 days, As uptake increased in S. acutus with higher PO43- concentrations, but decreased in P. duplex. Moreover, our findings revealed differences in cell morphology and membrane integrity between the two species in response to AsV and various PO43- concentrations. S. acutus maintained cell integrity under all experimental culture conditions, whereas P. duplex experienced cell lysis at elevated AsV and PO43- concentrations. This study highlights the varying responses of freshwater phytoplankton to changes in AsV and PO43- levels and underscores the advantages of SC-ICP-MS over conventional ICP-MS in providing detailed, cellular level insights. These findings are crucial for understanding and managing As pollution in aquatic ecosystems.
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Affiliation(s)
- Md Shah Alam
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
| | - Kuo H Wong
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
| | - Akari Ishikawa
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Meng Li
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Yinghan Zai
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Rimana Islam Papry
- Department of Environmental Science, College of Agricultural Sciences, IUBAT-International University of Business Agriculture and Technology, 4 Embankment Road, Sector 10, Uttara, Dhaka, 1230, Bangladesh
| | - Asami S Mashio
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Ismail M M Rahman
- Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima City, Fukushima 960-1296, Japan
| | - Hiroshi Hasegawa
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
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3
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Armin G, Kim J, Inomura K. Saturating growth rate against phosphorus concentration explained by macromolecular allocation. mSystems 2023; 8:e0061123. [PMID: 37642424 PMCID: PMC10654069 DOI: 10.1128/msystems.00611-23] [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: 06/15/2023] [Accepted: 06/28/2023] [Indexed: 08/31/2023] Open
Abstract
IMPORTANCE The Monod equation has been used to represent the relationship between growth rate and the environmental nutrient concentration under the limitation of this respective nutrient. This model often serves as a means to connect microorganisms to their environment, specifically in ecosystem and global models. Here, we use a simple model of a marine microorganism cell to illustrate the model's ability to capture the same relationship as Monod, while highlighting the additional physiological details our model provides. In this study, we focus on the relationship between growth rate and phosphorus concentration and find that RNA allocation largely contributes to the commonly observed trend. This work emphasizes the potential role our model could play in connecting microorganisms to the surrounding environment while using realistic physiological representations.
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Affiliation(s)
- Gabrielle Armin
- Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island, USA
| | - Jongsun Kim
- School of Earth, Environmental, and Marine Sciences, University of Texas Rio Grande Valley, Brownsville, Texas, USA
| | - Keisuke Inomura
- Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island, USA
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4
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Zeng C, Xing R, Huang B, Cheng X, Shi W, Liu S. Phytoplankton in headwater streams: spatiotemporal patterns and underlying mechanisms. FRONTIERS IN PLANT SCIENCE 2023; 14:1276289. [PMID: 37941677 PMCID: PMC10628446 DOI: 10.3389/fpls.2023.1276289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 10/11/2023] [Indexed: 11/10/2023]
Abstract
Phytoplankton are key members of river ecosystems wherein they influence and regulate the health of the local environment. Headwater streams are subject to minimal human activity and serve as the sources of rivers, generally exhibiting minimal pollution and strong hydrodynamic forces. To date, the characteristics of phytoplankton communities in headwater streams have remained poorly understood. This study aims to address this knowledge gap by comparing phytoplankton communities in headwater streams with those in plain rivers. The results demonstrated that within similar watershed sizes, lower levels of spatiotemporal variability were observed with respect to phytoplankton community as compared to plain rivers. Lower nutrient levels and strong hydrodynamics contribute to phytoplankton growth limitation in these streams, thereby reducing the levels of spatiotemporal variation. However, these conditions additionally contribute to greater phytoplankton diversity and consequent succession towards Cyanophyta. Overall, these results provide new insights into the dynamics of headwater stream ecosystems and support efforts for their ecological conservation.
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Affiliation(s)
- Chenjun Zeng
- School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, China
- Guangdong Research Institute of Water Resources and Hydropower, Guangzhou, China
| | - Ran Xing
- School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, China
| | - Bensheng Huang
- Guangdong Research Institute of Water Resources and Hydropower, Guangzhou, China
| | - Xiangju Cheng
- School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, China
| | - Wenqing Shi
- School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, China
| | - Shufeng Liu
- Guangdong Research Institute of Water Resources and Hydropower, Guangzhou, China
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5
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Pan B, Liu S, Wang Y, Li D, Li M. FT-ICR-MS combined with fluorescent spectroscopy reveals the driving mechanism of the spatial variation in molecular composition of DOM in 22 plateau lakes. ENVIRONMENTAL RESEARCH 2023:116272. [PMID: 37276978 DOI: 10.1016/j.envres.2023.116272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 05/21/2023] [Accepted: 05/27/2023] [Indexed: 06/07/2023]
Abstract
Dissolved organic matter (DOM) is the largest carbon pool and directly affects the biogeochemistry in lakes. In the current study, fourier transform ion cyclotron mass spectrometry (FT-ICR-MS) combined with fluorescent spectroscopy was used to assess the molecular composition and driving mechanism of DOM in 22 plateau lakes in Mongolia Plateau Lakes Region (MLR), Qinghai Plateau Lakes Region (QLR) and Tibet Plateau Lakes Region (TLR) of China. The limnic dissolved organic carbon (DOC) content ranged from 3.93 to 280.8 mg L-1 and the values in MLR and TLR were significantly higher than that in QLR. The content of lignin was the highest in each lake and showed a gradually decreasing trend from MLR to TLR. Random forest model and structural equation model implied that altitude played an important role in lignin degradation while the contents of total nitrogen (TN) and chlorophyll a (Chl-a) have a great influence on the increase of DOM Shannon index. Our results also suggested that the inspissation of DOC and the promoted endogenous DOM production caused by the inspissation of nutrient resulted in a positive relationship between limnic DOC content and limnic factors such as salinity, alkalinity and nutrient concentration. From MLR to QLR and TLR, the molecular weight and the number of double bonds gradually decreased but the humification index (HIX) also decreased. In addition, from the MLR to the TLR, the proportion of lignin gradually decreased, while the proportion of lipid gradually increased. Both above results suggested that photodegradation was dominated in lakes of TLR, while microbial degradation was dominated in lakes of MLR.
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Affiliation(s)
- Baozhu Pan
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, 710048, Shaanxi, PR China
| | - Siwan Liu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, PR China
| | - Yeyong Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, PR China
| | - Dianbao Li
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, 710048, Shaanxi, PR China
| | - Ming Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, Shaanxi, PR China.
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6
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Jin H, Van de Waal DB, van Leeuwen CHA, Lamers LPM, Declerck SAJ, Amorim AL, Bakker ES. Restoring gradual land-water transitions in a shallow lake improved phytoplankton quantity and quality with cascading effects on zooplankton production. WATER RESEARCH 2023; 235:119915. [PMID: 36996752 DOI: 10.1016/j.watres.2023.119915] [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: 11/18/2022] [Revised: 03/18/2023] [Accepted: 03/23/2023] [Indexed: 06/19/2023]
Abstract
Land-water transition areas play a significant role in the functioning of aquatic ecosystems. However, anthropogenic pressures are posing severe threats on land-water transition areas, which leads to degradation of the ecological integrity of many lakes worldwide. Enhancing habitat complexity and heterogeneity by restoring land-water transition areas in lake systems is deemed a suitable method to restore lakes bottom-up by stimulating lower trophic levels. Stimulating productivity of lower trophic levels (phytoplankton, zooplankton) generates important food sources for declining higher trophic levels (fish, birds). Here, we study ecosystem restoration project Marker Wadden in Lake Markermeer, The Netherlands. This project involved the construction of a 700-ha archipelago of five islands in a degrading shallow lake, aiming to create additional sheltered land-water transition areas to stimulate food web development from its base by improving phytoplankton quantity and quality. We found that phytoplankton quantity (chlorophyll-a concentration) and quality (inversed carbon:nutrient ratio) in the shallow waters inside the Marker Wadden archipelago were significantly improved, likely due to higher nutrient availabilities, while light availability remained sufficient, compared to the surrounding lake. Higher phytoplankton quantity and quality was positively correlated with zooplankton biomass, which was higher inside the archipelago than in the surrounding lake due to improved trophic transfer efficiency between phytoplankton and zooplankton. We conclude that creating new land-water transition areas can be used to increase light and nutrient availabilities and thereby enhancing primary productivity, which in turn can stimulate higher trophic levels in degrading aquatic ecosystems.
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Affiliation(s)
- Hui Jin
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, Wageningen 6708PB, the Netherlands.
| | - Dedmer B Van de Waal
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, Wageningen 6708PB, the Netherlands; Department of Freshwater and Marine Ecology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Sciencepark 904, Amsterdam 1098 XH, The Netherlands
| | - Casper H A van Leeuwen
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, Wageningen 6708PB, the Netherlands
| | - Leon P M Lamers
- Aquatic Ecology and Environmental Biology, Institute for Water and Wetland Research, Radboud University, PO Box 9010, GL Nijmegen 6500, The Netherlands
| | - Steven A J Declerck
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, Wageningen 6708PB, the Netherlands
| | - Ana Luisa Amorim
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, Wageningen 6708PB, the Netherlands; AQUON- Wateronderzoek en Advies. Voorschoterweg 18h, AB Leiden 2324, The Netherlands
| | - Elisabeth S Bakker
- Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, Wageningen 6708PB, the Netherlands; Wildlife Ecology and Conservation Group, Wageningen University (WUR), Droevendaalsesteeg 2, Wageningen 6708PB, The Netherlands
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7
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Hou X, Mu L, Hu X, Guo S. Warming and microplastic pollution shape the carbon and nitrogen cycles of algae. JOURNAL OF HAZARDOUS MATERIALS 2023; 447:130775. [PMID: 36669419 DOI: 10.1016/j.jhazmat.2023.130775] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 01/01/2023] [Accepted: 01/10/2023] [Indexed: 06/17/2023]
Abstract
Oceans absorb most excess heat from anthropogenic activities, leading to ocean warming. Moreover, microplastic pollution from anthropogenic activities is serious in marine environments and is accessible to various organisms. However, the combined effects of environmentally realistic ocean warming and microplastic pollution (OW+MP) on dominant marine species phytoplankton and related biochemical cycles are unclear. We investigated the combined effects on the dominant genera of diatoms (Chaetoceros gracilis, C. gracilis) over 100 generations. As a biological adjustment strategy, the growth rates of C. gracilis were nonsignificantly changed by OW+MP, body size decreased, and the chlorophyll a (Chl a) content and photosynthetic efficiency significantly decreased by 32.5% and 10.86%, respectively. The OW+MP condition inhibited carbon and nitrogen assimilation and sequestration capacity and allocated carbon into flexible forms of carbohydrates instead of proteins. Furthermore, the decrease in Si:C and Si:N ratios affected carbon transport to both the mesopelagic layer and deep ocean. Integrated transcriptomics and metabolomics showed that OW+MP disturbed ribosome and nitrogen metabolism. Given the rising concurrence of warming and MP pollution, the changes in metabolism suggest that the covariation in carbon, nitrogen and silicon biochemical cycles and the hidden influence on biodiversity and food web changes in the ocean should be reconsidered.
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Affiliation(s)
- Xuan Hou
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, 300350 Tianjin, China
| | - Li Mu
- Tianjin Key Laboratory of Agro-Environment and Safe-Product, Key Laboratory for Environmental Factors Control of Agro-Product Quality Safety (Ministry of Agriculture and Rural Affairs), Institute of Agro-Environmental Protection, Ministry of Agriculture and Rural Affairs, 300191 Tianjin, China
| | - Xiangang Hu
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, 300350 Tianjin, China.
| | - Shuqing Guo
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, 300350 Tianjin, China
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8
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Tong Y, Huang Z, Janssen ABG, Wishart M, He W, Wang X, Zhao Y. Influence of social and environmental drivers on nutrient concentrations and ratios in lakes: A comparison between China and Europe. WATER RESEARCH 2022; 227:119347. [PMID: 36399843 DOI: 10.1016/j.watres.2022.119347] [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: 06/14/2022] [Revised: 10/24/2022] [Accepted: 11/08/2022] [Indexed: 06/16/2023]
Abstract
Global anthropogenic flows of nitrogen (N) and phosphorus (P) have exceeded planetary boundaries with significant implications for pollution of the freshwater resources in the world. Understanding the global patterns and drivers of N and P concentrations and their ratios in the lakes could help design more effective management and remediation strategies to mitigate the impacts of eutrophication. While a suite of drivers are associated with the sources of nutrients, their transport and internal processes that control concentrations of N and P in the lakes, much less is known about the relative importance of different drivers in explaining spatial variations of lake nutrients and ratios. In this study, we compared N and P concentrations and their ratios in the lakes across China and Europe and examined the differences of dominant environmental and social drivers on lake nutrients. Our comparison showed that total nitrogen (TN) and total phosphorus (TP) concentrations were much higher in the lakes in China compared to those in Europe (i.e., TN: 1.13 mg/L in China vs. 0.64 mg/L in Europe; TP: 35.83 μg/L in China vs. 19.38 μg/L in Europe, the median value). However, lake N/P ratios for both regions were not statistically different. Concentrations of TN and TP showed decoupling in both regions, with the majority of lakes having high N/P mass ratios when evaluated by the commonly accepted threshold of 23 (i.e., 61% in China and 68% in Europe), indicating that phytoplankton are more P limited relative to N. Agricultural activity in the lake catchment is an important predictor for both nutrient concentrations and their ratio in Europe. This reflects successful investments in infrastructure and policy prescriptions in addressing point sources of pollution. In comparison, lake depth and water residence time are important in the decoupling of N and P concentrations in China. The regional difference between the dominant drivers can provide important insights into development of effective water pollution control measures. It is necessary for policy makers and water resource managers to be aware of large-scale imbalance of nutrients in lake due to the potential environmental consequences. A set of spatially flexible policies for water quality controls would be beneficial for sustaining the ecological integrity and future health of lakes.
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Affiliation(s)
- Yindong Tong
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China; School of Science, Tibet University, Lhasa 850000, China.
| | - Zhao Huang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China
| | - Annette B G Janssen
- Water Systems and Global Change Group, Wageningen University & Research, PO Box 47, 6700 AA Wageningen, the Netherlands
| | | | - Wei He
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
| | - Xuejun Wang
- College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
| | - Yingxin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
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9
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Adekolurejo OA, Floyd M, Dunn AM, Kay P, Dean AP, Hassall C. Combined effects of increased water temperature and cyanobacterial compounds exert heterogeneous effects on survival and ecological processes in key freshwater species. Oecologia 2022; 200:515-528. [PMID: 36342526 PMCID: PMC9675649 DOI: 10.1007/s00442-022-05277-7] [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: 08/23/2021] [Accepted: 10/31/2022] [Indexed: 11/09/2022]
Abstract
Climate change is increasing water temperature and intensifying the incidence of cyanobacterial blooms worldwide. However, the combined effects of increased temperature and microcystin concentrations as co-stressors on survival and ecological processes in freshwater species are unclear. Here, using purified MC-LR and crude extract of toxigenic Microcystis aeruginosa, we tested the individual and combined effects of three water temperatures (15, 20, 25 °C) and a range of environmentally relevant concentrations of dissolved microcystin and crude extract (0.01-10 µg·L-1) on survival, growth inhibition, grazing and predation rates in three freshwater species: phytoplankton (Scenedesmus quadricauda), zooplankton (Daphnia pulex), and an invertebrate predator (Ischnura elegans). Purified MC-LR exerted a higher growth inhibitory effect on S. quadricauda compared to crude extract with the same concentration of MC-LR, while neither treatment affected its chlorophyll-a content or survival of D. pulex. Crude extract reduced grazing and survival of D. pulex and I. elegans, respectively. The combined effect of higher temperature and crude extract reduced I. elegans survival by 50%. Increased temperature reduced prey handing time in I. elegans by 49%, suggesting a higher predation rate. However, warming together with higher concentrations of crude extract jointly increased zooplankton grazing and reduced damselfly predation. Taken together, these results suggest crude extract, and not necessarily microcystin, can affect survival and productivity in freshwater species, although these effects may vary unevenly across trophic levels. Our findings highlight the importance of complex ecological mechanisms by which warming can exacerbate toxic effects of cyanobacterial bloom extracts on survival and functions among species in eutrophic freshwaters.
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Affiliation(s)
- Oloyede A Adekolurejo
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Matthew Floyd
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Alison M Dunn
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Paul Kay
- School of Geography, Faculty of Environment, University of Leeds, Leeds, LS2 9JT, UK
| | - Andrew P Dean
- Department of Natural Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, M1 5GD, UK
| | - Christopher Hassall
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK.
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10
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Kim J, Armin G, Inomura K. Saturating relationship between phytoplankton growth rate and nutrient concentration explained by macromolecular allocation. CURRENT RESEARCH IN MICROBIAL SCIENCES 2022; 3:100167. [PMID: 36518172 PMCID: PMC9742995 DOI: 10.1016/j.crmicr.2022.100167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 08/22/2022] [Accepted: 09/20/2022] [Indexed: 11/16/2022] Open
Abstract
Phytoplankton account for about a half of photosynthesis in the world, making them a key player in the ecological and biogeochemical systems. One of the key traits of phytoplankton is their growth rate because it indicates their productivity and affects their competitive capability. The saturating relationship between phytoplankton growth rate and environmental nutrient concentration has been widely observed yet the mechanisms behind the relationship remain elusive. Here we use a mechanistic model and metadata of phytoplankton to show that the saturating relationship between growth rate and nitrate concentration can be interpreted by intracellular macromolecular allocation. At low nitrate levels, the diffusive nitrate transport linearly increases with the nitrate concentration, while the internal nitrogen requirement increases with the growth rate, leading to a non-linear increase in the growth rate with nitrate. This increased nitrogen requirement is due to the increased allocation to biosynthetic and photosynthetic molecules. The allocation to these molecules reaches a maximum at high nitrate concentration and the growth rate ceases to increase despite high nitrate availability due to carbon limitation. The produced growth rate and nitrate relationships are consistent with the data of phytoplankton across taxa. Our study provides a macromolecular interpretation of the widely observed growth-nutrient relationship and highlights that the key control of the phytoplankton growth exists within the cell.
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Affiliation(s)
- Jongsun Kim
- School of Earth, Environmental, and Marine Sciences, University of Texas Rio Grande Valley, Brownsville, TX, USA
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA
| | - Gabrielle Armin
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA
| | - Keisuke Inomura
- Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, USA
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11
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Feniova IY, Sakharova EG, Krylov AV. Transfer of Essential Substances from Phytoplankton to Zooplankton in Freshwater Ecosystems (Review). CONTEMP PROBL ECOL+ 2022. [DOI: 10.1134/s1995425522040059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Yuan LL, Jones JR. Estimating phytoplankton stoichiometry from routinely collected monitoring data. BIOGEOCHEMISTRY 2022; 159:251-264. [PMID: 37681215 PMCID: PMC10483987 DOI: 10.1007/s10533-022-00926-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 04/04/2022] [Indexed: 09/09/2023]
Abstract
Accurately estimating the elemental stoichiometry of phytoplankton is critical for understanding biogeochemical cycles. In laboratory experiments, stoichiometric ratios vary among species and with changes in environmental conditions. Field observations of total phosphorus (P) and total nitrogen (N) collected at regional and national scales can supplement and expand insights into factors influencing phytoplankton stoichiometry, but analyses applied to these data can introduce biases that affect interpretations of the observed patterns. We introduce an analytical approach for estimating the ratio between phytoplankton N and P from the particulate fraction of nutrient pools in lake samples. We use Bayesian models to represent observations of particulate P and N as the sum of contributions from nutrients bound within phytoplankton and nutrients associated with non-phytoplankton suspended sediment. Application of this approach to particulate nutrient data collected in Missouri impoundments yields estimates of the mass ratio of N:P in phytoplankton ranging from 8-10 across a variety of lakes and seasons. N:P in particulate matter ranged from 6 to 70, a variability driven by differences in nutrients bound to non-phytoplankton suspended sediment. We adapted the Bayesian models to estimate N:P using more commonly available measurements of total P and total N and applied this model to a continental-scale monitoring data set. We compared phytoplankton nutrient content estimated from the two analyses and found that when datasets lack direct measurements of particulate nutrient concentrations, the model estimate of phytoplankton nutrient content includes contributions from nutrients within phytoplankton and dissolved nutrients that are associated with changes in phytoplankton biomass.
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Affiliation(s)
- Lester L. Yuan
- Office of Water, U.S. Environmental Protection Agency, 1200 Pennsylvania Ave, NW (Mail code 4304T), Washington DC 20460
| | - John R. Jones
- School of Natural Resources, University of Missouri, Columbia
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13
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Influence of N:P Ratio of Water on Ecological Stoichiometry of Vallisneria natans and Hydrilla verticillata. WATER 2022. [DOI: 10.3390/w14081263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Eutrophication is one of the major threats to shallow lake ecosystems, because it causes large-scale degradation of submerged plants. N:P ratio is an important indicator to estimate nutrient supply to water bodies and guide the restoration of submerged plants. The massive input of N and P changes the structure of aquatic communities and ecological processes. However, the mechanism underlying the influence of changes in N and P content and the N:P ratio of a water body on the growth of submerged plants is still unclear. In this study, we simulated gradients of water N:P ratio in lakes in the middle-lower reaches of the Yangtze River using outdoor mesocosm experiments. Using established generalized linear models (GLM), the effects of total nitrogen (TN) content and N:P ratio of water, phytoplankton and periphytic algae biomass, and relative growth rate (RGR) of plants on the stoichiometric characteristics of two widely distributed submerged plants, Hydrilla verticillata and Vallisneria natans, were explored. The results reveal that changes in water nutrient content affected the C:N:P stoichiometry of submerged plants. In a middle-eutrophic state, the stoichiometric characteristics of C, N, and P in the submerged plants were not influenced by phytoplankton and periphytic algae. The P content of H. verticillata and V. natans was positively correlated with their relative growth rate (RGR). As TN and N:P ratio of water increased, their N content increased and C:N decreased. These results indicate that excessive N absorption by submerged plants and the consequent internal physiological injury and growth inhibition may be the important reasons for the degradation of submerged vegetation in the process of lake eutrophication.
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14
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Abdelmageed AA, Ellah RGA, Abdel-Satar AM, Gawad SSA, Khalifa N, Zaher SS, Othman AA, Belal DM, El-Hady HHA, Salem SG, Abdo MH, Haroon AM, El-Far A, Hegab MH, Elhaddad E, El-Sherif DM, Al-Afify ADG. Evaluation of the ecological health and food chain on the shores of four River Nile Islands, Egypt. ENVIRONMENTAL MONITORING AND ASSESSMENT 2022; 194:309. [PMID: 35353284 PMCID: PMC8969041 DOI: 10.1007/s10661-022-09959-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 03/19/2022] [Indexed: 06/14/2023]
Abstract
This study was conducted to evaluate the impact of human activities on the ecological health and food chain at the shores of four Nile Islands in Great Cairo including El-Qeratten, El-Waraq, El-Zamalek, and El-Manial. Water quality, bacteria, phytoplankton, benthic algae, zooplankton, macrobenthic invertebrates, and bony fishes were examined at each island shore over two seasons including the lowest and the highest flow (February and July 2020, respectively). The obtained results showed that the average values of most of the chemicals in Nile Island's water were within the Egyptian water quality limits. Discriminant analysis of physicochemical factors revealed a similarity between El-Waraq and El-Qerateen and between El-Manial and El-Zamalek. El-Qeratten was the most polluted island. It has the highest total and fecal coliform bacteria count (3.155 and 3.050 Log MPN/100 mL, respectively). El-Zamalek shores have the highest phytoplankton (33,582 cells × 104 L-1) and zooplankton count (310,891 organisms × m-3) and phyto-biochemical values. Biochemical analysis of phytoplankton demonstrated the richness of the bulk by protein (> 85% of biomass), indicating that phytoplankton has a high nutritional value. Elevated zooplankton count was recorded at El-Zamalek, which coincided with the peak of phytoplankton abundance. Mollusca were the dominant macrobenthic invertebrates on most of the island's shores. Bony fishes were represented by 27 species and two crustaceans. The levels of the metals in fish samples were compared with the food safety guideline endorsed by the World Health Organization and Food and Agriculture Organization (WHO/FAO) to evaluate the toxicity level.
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Affiliation(s)
| | | | | | | | - Nehad Khalifa
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Shymaa S Zaher
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Amal A Othman
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Dalia M Belal
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | | | - Salem G Salem
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Mohamed H Abdo
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Amany M Haroon
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Alaa El-Far
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Mahmoud H Hegab
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Engy Elhaddad
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
| | - Dina M El-Sherif
- National Institute of Oceanography and Fisheries (NIOF), Cairo, Egypt
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15
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Schulhof MA, Van de Waal DB, Declerck SAJ, Shurin JB. Phytoplankton functional composition determines limitation by nutrients and grazers across a lake productivity gradient. Ecosphere 2022. [DOI: 10.1002/ecs2.4008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Marika A. Schulhof
- Division of Biological Sciences Section of Ecology, Behavior & Evolution, University of California San Diego La Jolla California USA
- Department of Aquatic 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
| | - Steven A. J. Declerck
- Department of Aquatic Ecology Netherlands Institute of Ecology (NIOO‐KNAW) Wageningen The Netherlands
- Laboratory of Aquatic Ecology Evolution and Conservation, KU Leuven Leuven Belgium
| | - Jonathan B. Shurin
- Division of Biological Sciences Section of Ecology, Behavior & Evolution, University of California San Diego La Jolla California USA
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16
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Increases in Picocyanobacteria Abundance in Agriculturally Eutrophic Pampean Lakes Inferred from Historical Records of Secchi Depth and Chlorophyll-a. WATER 2022. [DOI: 10.3390/w14020159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Phytoplankton size structure has profound consequences on food-web organization and energy transfer. Presently, picocyanobacteria (size < 2 µm) represent a major fraction of the autotrophic plankton of Pampean lakes. Glyphosate is known to stimulate the development of picocyanobacteria capable of degrading the herbicide. Due to the worldwide adoption of glyphosate-resistant crops, herbicide usage has increased sharply since the mid-1990s. Unfortunately, there are very few studies (none for the Pampa region) reporting picocyanobacteria abundance before 2000. The proliferation of µm sized particles should decrease Secchi disc depth (ZSD). Therefore ZSD, conditional to chlorophyll-a, may serve as an indicator of picocyanobacteria abundance. We use generalized additive models (GAMs) to analyze a “validation” dataset consisting of 82 records of ZSD, chlorophyll-a, and picocyanobacteria abundance from two Pampean lakes surveys (2009 and 2015). In support of the hypothesis, ZSD was negatively related to picocyanobacteria after accounting for the effect of chlorophyll-a. We then fitted a “historical” dataset using hierarchical GAMs to compare ZSD conditional to chlorophyll-a, before and after 2000. We estimated that ZSD levels during 2000–2021 were, on average, only about half as deep as those during 1980–1999. We conclude that the adoption of glyphosate-resistant crops has stimulated outbreaks of picocyanobacteria populations, resulting in lower water transparency.
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17
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Pacheco JP, Aznarez C, Meerhoff M, Liu Y, Li W, Baattrup-Pedersen A, Yu C, Jeppesen E. Small-sized omnivorous fish induce stronger effects on food webs than warming and eutrophication in experimental shallow lakes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 797:148998. [PMID: 34346382 DOI: 10.1016/j.scitotenv.2021.148998] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 07/02/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
Warming, eutrophication, and increased omnivory by small-sized fish are global change processes that induce major effects on the food web structure and primary producers of shallow lakes. Despite the key relevance of phytoplankton and periphyton in freshwaters, the combined and potential synergistic effects of fish omnivory, warming and eutrophication, especially on periphyton, remains little addressed, particularly for subtropical shallow lakes. We experimentally tested the food web effects on phytoplankton and periphyton induced by small visually feeding omnivorous fish (Rhodeus ocellatus), high nutrient enrichment and warming (+4.5 °C) in thirty-two 1000 L-mesocosms simulating littoral conditions of subtropical shallow lakes. We aimed at analysing the mechanisms and responses of periphyton and phytoplankton to these experimental factors. All mesocosms included the submerged macrophytes Vallisneria denseserrulata and Potamogeton lucens and artificial plants at 50% plant volume inhabited, plankton and macroinvertebrates. Small-sized visually feeding omnivorous fish enhanced phytoplankton dominance and periphyton loss. These changes coincided with a decrease in zooplankton biomass and a diversity loss of both zooplankton and macroinvertebrates as well as an increase in snail abundance. Fish presence led to a collapse of cladocerans, thereby releasing the grazing pressure on phytoplankton, and predator and collector macroinvertebrates were replaced with small snails (Radix peregra < 0.5 cm) resulting in enhanced grazing on periphyton. Eutrophication reinforced the fish effects, while warming had weak or no effects. Our results indicate that omnivory by small-sized visually feeding fish may induce stronger effects on the food webs of shallow lakes, towards phytoplankton-dominated states, than the combined effect of nutrient enrichment and warming under the present experimental conditions.
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Affiliation(s)
- Juan Pablo Pacheco
- Department of Bioscience, Aarhus University, Silkeborg 8600, Denmark; Sino-Danish Centre for Education and Research (SDC), Beijing 100049, China; University of Chinese Academy of Sciences, Beijing 100049, China; CURE - University of the Republic, Maldonado 20000, Uruguay.
| | - Celina Aznarez
- Basque Centre for Climate Change (BC3), Leioa 48940, Spain
| | - Mariana Meerhoff
- Department of Bioscience, Aarhus University, Silkeborg 8600, Denmark; CURE - University of the Republic, Maldonado 20000, Uruguay
| | - Yang Liu
- University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
| | - Wei Li
- University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
| | | | - Cao Yu
- Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China.
| | - Erik Jeppesen
- Department of Bioscience, Aarhus University, Silkeborg 8600, Denmark; Sino-Danish Centre for Education and Research (SDC), Beijing 100049, China; Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara, Turkey; Institute of Marine Sciences, Middle East Technical University, Mersin, Turkey
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18
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Huss M, van Dorst RM, Gårdmark A. Larval fish body growth responses to simultaneous browning and warming. Ecol Evol 2021; 11:15132-15140. [PMID: 34765165 PMCID: PMC8571572 DOI: 10.1002/ece3.8194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 08/16/2021] [Accepted: 09/02/2021] [Indexed: 12/25/2022] Open
Abstract
Organisms are facing global climate change and other anthropogenic pressures, but most research on responses to such changes only considers effects of single drivers. Observational studies and physiological experiments suggest temperature increases will lead to faster growth of small fish. Whether this effect of warming holds in more natural food web settings with concurrent changes in other drivers, such as darkening water color ("browning") is, however, unknown. Here, we set up a pelagic mesocosm experiment with large bags in the Baltic Sea archipelago, inoculated with larval Eurasian perch (Perca fluviatilis) and zooplankton prey and varying in temperature and color, to answer the question how simultaneous warming and browning of coastal food webs impact body growth and survival of larval perch. We found that browning decreased body growth and survival of larval perch, whereas warming increased body growth but had no effect on survival. Based on daily fish body growth estimates based on otolith microstructure analysis, and size composition and abundance of available prey, we explain how these results may come about through a combination of physiological responses to warming and lower foraging efficiency in brown waters. We conclude that larval fish responses to climate change thus may depend on the relative rate and extent of both warming and browning, as they may even cancel each other out.
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Affiliation(s)
- Magnus Huss
- Department of Aquatic ResourcesSwedish University of Agricultural SciencesÖregrundSweden
| | - Renee M. van Dorst
- Department of Aquatic ResourcesSwedish University of Agricultural SciencesÖregrundSweden
- Department of Biology and Ecology of FishesLeibniz‐Institute of Freshwater Ecology and Inland FisheriesBerlinGermany
| | - Anna Gårdmark
- Department of Aquatic ResourcesSwedish University of Agricultural SciencesÖregrundSweden
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19
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Cheung YY, Cheung S, Mak J, Liu K, Xia X, Zhang X, Yung Y, Liu H. Distinct interaction effects of warming and anthropogenic input on diatoms and dinoflagellates in an urbanized estuarine ecosystem. GLOBAL CHANGE BIOLOGY 2021; 27:3463-3473. [PMID: 33934458 DOI: 10.1111/gcb.15667] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 04/20/2021] [Indexed: 06/12/2023]
Abstract
Diatoms and dinoflagellates are two major bloom-forming phytoplankton groups in coastal ecosystems and their dominances will notably affect the marine ecosystems. By analyzing an 18-year monthly monitoring dataset (2000-2017) in the Pearl River Estuary (one of the most highly urbanized and populated estuarine in the world), we observe an increasing trend of the diatom to dinoflagellate ratio (Diatom/Dino). As revealed by multiple statistical models (generalized additive mixed model, random forest, and gradient boosting algorithms), both groups are positively correlated with temperature. Diatoms are positively correlated with nitrate and negatively correlated with ammonium while dinoflagellates show an opposite pattern. The Diatom/Dino trend is explained by an altered nutrient composition caused by a decadal increase in anthropogenic input, at which nitrate increased rapidly while ammonium and phosphate were relatively constant. Regarding the interaction of warming and nutrient dynamics, we observe an additive effect of warming and nitrate enrichment that promotes the increase in diatom cell density, while the dinoflagellate cell density only increases with warming when nutrients are depleted. Our models predict that the Diatom/Dino ratio will further increase with increasing anthropogenic input and global warming in subtropical estuarine ecosystems with nitrate as the dominant inorganic nitrogen; its ecological consequences are worthy of further investigation.
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Affiliation(s)
- Yan Yin Cheung
- Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong SAR, China
| | - Shunyan Cheung
- Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong SAR, China
- Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
| | - Julian Mak
- Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong SAR, China
- Hong Kong Branch of Southern Marine Science & Engineering Guangdong Laboratory, The Hong Kong University of Science and Technology, Hong Kong SAR, China
| | - Kailin Liu
- Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong SAR, China
| | - Xiaomin Xia
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
| | - Xiaodong Zhang
- Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong SAR, China
| | - Yingkit Yung
- Water Policy and Planning Group, Hong Kong Government Environmental Protection Department, Hong Kong SAR, China
| | - Hongbin Liu
- Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong SAR, China
- Hong Kong Branch of Southern Marine Science & Engineering Guangdong Laboratory, The Hong Kong University of Science and Technology, Hong Kong SAR, China
- State Key Laboratory of Marine Pollution, Hong Kong SAR, China
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20
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Cabrerizo MJ, Marañón E. Grazing Pressure Is Independent of Prey Size in a Generalist Herbivorous Protist: Insights from Experimental Temperature Gradients. MICROBIAL ECOLOGY 2021; 81:553-562. [PMID: 32829442 DOI: 10.1007/s00248-020-01578-7] [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: 05/19/2020] [Accepted: 08/14/2020] [Indexed: 06/11/2023]
Abstract
Grazing by herbivorous protists contributes to structuring plankton communities through its effect on the growth, biomass, and competitiveness of prey organisms and also impacts the transfer of primary production towards higher trophic levels. Previous evidence shows that heterotrophic processes (grazing rates, g) are more sensitive to temperature than autotrophic ones (phytoplankton growth rates, μ) and also that small cells tend to be more heavily predated than larger ones; however, it remains unresolved how the interplay between changes in temperature and cell size modulates grazing pressure (i.e., g:μ ratio). We addressed this problem by conducting an experiment with four phytoplankton populations, from pico- to microphytoplankton, over a 12 °C gradient and in the presence/absence of a generalist herbivorous protist, Oxyrrhis marina. We found that highest g rates coincided with highest μ rates, which corresponded to intermediate cell sizes. There were no significant differences in either μ or g between the smallest and largest cell sizes considered. The g:μ ratio was largely independent of cell size and C:N ratios, and its thermal dependence was low although species-specific differences were large. We suggest that the similar g:μ found could be the consequence that the energetic demand imposed by rising temperatures would be a more important issue than the mechanical constriction to ingestion derived from prey cell size. Despite the difficulty of quantifying μ and g in natural planktonic communities, we suggest that the g:μ ratio is a key response variable to evaluate thermal sensitivity of food webs because it gives a more integrative view of trophic functioning than both rates separately.
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Affiliation(s)
- Marco J Cabrerizo
- Centro de Investigación Mariña da Universidade de Vigo (CIM-UVigo), Illa de Toralla s/n, 36331, Vigo, Spain.
- Departamento de Ecología y Biología Animal, Facultad de Ciencias del Mar, Universidade de Vigo, Campus Lagoas Marcosende s/n, 36310, Vigo, Spain.
| | - Emilio Marañón
- Centro de Investigación Mariña da Universidade de Vigo (CIM-UVigo), Illa de Toralla s/n, 36331, Vigo, Spain
- Departamento de Ecología y Biología Animal, Facultad de Ciencias del Mar, Universidade de Vigo, Campus Lagoas Marcosende s/n, 36310, Vigo, Spain
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21
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Jin P, Gonzàlez G, Agustí S. Long-term exposure to increasing temperature can offset predicted losses in marine food quality (fatty acids) caused by ocean warming. Evol Appl 2020; 13:2497-2506. [PMID: 33005237 PMCID: PMC7513733 DOI: 10.1111/eva.13059] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 06/29/2020] [Accepted: 07/01/2020] [Indexed: 12/14/2022] Open
Abstract
Marine phytoplankton produce essential fatty acids (FA), which are key component of a healthy diet in humans and marine food webs. Increased temperatures can reduce lipid and FA content in phytoplankton; thus, ocean warming poses a risk for the global production of these essential FA. However, responses to warming may differ between phytoplankton species especially after long-term exposure because phenotypic plasticity, de novo mutations, or genetic evolution may occur. Here, we examine the content of FA and lipids in phytoplankton following long-term selection (~2 years) to warming conditions (+4°C), and we observe that FA and lipids content were partly or entirely recovered following long-term exposure to warming conditions. Furthermore, this observed long-term response also offset the predicted losses of some essential polyunsaturated fatty acids (PUFA) in three of the four species tested. Our study suggests that long-term exposure of phytoplankton to warming may help to maintain marine food quality in a moderately warming ocean. The responses of FA to increasing temperatures may vary among species, and the level of this idiosyncrasy remains to be further studied.
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Affiliation(s)
- Peng Jin
- Red Sea Research Center (RSRC) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia
- School of Environmental Science and Engineering Guangzhou University Guangzhou China
| | - Gala Gonzàlez
- Red Sea Research Center (RSRC) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia
| | - Susana Agustí
- Red Sea Research Center (RSRC) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia
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22
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Schulhof MA, Allen AE, Allen EE, Mladenov N, McCrow JP, Jones NT, Blanton J, Cavalheri HB, Kaul D, Symons CC, Shurin JB. Sierra Nevada mountain lake microbial communities are structured by temperature, resources and geographic location. Mol Ecol 2020; 29:2080-2093. [DOI: 10.1111/mec.15469] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 03/02/2020] [Accepted: 04/28/2020] [Indexed: 11/28/2022]
Affiliation(s)
- Marika A. Schulhof
- Division of Biological Sciences University of California San Diego La Jolla CA USA
| | - Andrew E. Allen
- Scripps Institution of Oceanography University of California San Diego La Jolla CA USA
- Department of Microbial and Environmental Genomics J. Craig Venter Institute La Jolla CA USA
| | - Eric E. Allen
- Division of Biological Sciences University of California San Diego La Jolla CA USA
- Scripps Institution of Oceanography University of California San Diego La Jolla CA USA
| | - Natalie Mladenov
- Department of Civil, Construction, & Environmental Engineering San Diego State University San Diego CA USA
| | - John P. McCrow
- Department of Microbial and Environmental Genomics J. Craig Venter Institute La Jolla CA USA
| | - Natalie T. Jones
- Division of Biological Sciences University of California San Diego La Jolla CA USA
- School of Biological Sciences University of Queensland Brisbane Qld Australia
| | - Jessica Blanton
- Scripps Institution of Oceanography University of California San Diego La Jolla CA USA
| | - Hamanda B. Cavalheri
- Division of Biological Sciences University of California San Diego La Jolla CA USA
| | - Drishti Kaul
- Department of Microbial and Environmental Genomics J. Craig Venter Institute La Jolla CA USA
| | - Celia C. Symons
- Division of Biological Sciences University of California San Diego La Jolla CA USA
- Department of Ecology and Evolutionary Biology University of California Irvine Irvine CA USA
| | - Jonathan B. Shurin
- Division of Biological Sciences University of California San Diego La Jolla CA USA
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23
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Cyanobacterial Blooms and Zooplankton Structure in Lake Ecosystem under Limited Human Impact. WATER 2020. [DOI: 10.3390/w12051252] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Cyanobacterial blooms are tightly related to increasing trophic conditions of lakes and climate warming. Abiotic and biotic parameters were studied in a shallow lake, in which the island with the largest cormorants colony in north-eastern Poland is situated. We hypothesized that the strongest cyanobacterial blooms will persist near the cormorant’s island and will decrease with an increasing distance from it. Filamentous cyanobacteria (Pseudanabaena, Planktolyngbya, Limnothrix, Planktothrix) were the main phytoplankton components during summer and autumn. Their strongest blooms (up to 66 mg L−1) were recorded near the roosting area. The content of nutrients and chlorophyll a, and the biomass of phytoplankton (primarily cyanobacteria) and zooplankton, decreased gradually with the increasing distance from the island. The changes from hypertrophic to eutrophic conditions were confirmed by a decrease in values of the trophic state index from 72 (site 1) to 58 (site 5). This all suggests that cormorants might have a significant impact on the deterioration of water quality (at distance to 1.6 km) and can contribute to faster water eutrophication. Our results suggest that protection of breeding sites for many waterbirds, such as cormorants, becomes a real threat for the functioning of aquatic ecosystems due to a large load of nutrients.
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24
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Cabrerizo MJ, Álvarez-Manzaneda MI, León-Palmero E, Guerrero-Jiménez G, de Senerpont Domis LN, Teurlincx S, González-Olalla JM. Warming and CO 2 effects under oligotrophication on temperate phytoplankton communities. WATER RESEARCH 2020; 173:115579. [PMID: 32059127 DOI: 10.1016/j.watres.2020.115579] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 01/18/2020] [Accepted: 02/01/2020] [Indexed: 06/10/2023]
Abstract
Eutrophication, global warming, and rising carbon dioxide (CO2) levels are the three most prevalent pressures impacting the biosphere. Despite their individual effects are well-known, it remains untested how oligotrophication (i.e. nutrients reduction) can alter the planktonic community responses to warming and elevated CO2 levels. Here, we performed an indoor mesocosm experiment to investigate the warming × CO2 interaction under a nutrient reduction scenario (40%) mediated by an in-lake management strategy (i.e. addition of a commercial solid-phase phosphorus sorbent -Phoslock®) on a natural freshwater plankton community. Biomass production increased under warming × CO2 relative to present-day conditions; however, a Phoslock®-mediated oligotrophication reduced such values by 30-70%. Conversely, the warming × CO2 × oligotrophication interaction stimulated the photosynthesis by 20% compared to ambient nutrient conditions, and matched with higher resource use efficiency (RUE) and nutrient demand. Surprisingly, at a group level, we found that the multi-stressors scenario increased the photosynthesis in eukaryotes by 25%, but greatly impaired in cyanobacteria (ca. -25%). This higher cyanobacterial sensitivity was coupled with a reduced light harvesting efficiency and compensation point. Since Phoslock®-induced oligotrophication unmasked a strong negative warming × CO2 effect on cyanobacteria, it becomes crucial to understand how the interplay between climate change and nutrient abatement actions may alter the, ecosystems functioning. With an integrative understanding of these processes, policy makers will design more appropriate management strategies to improve the ecological status of aquatic ecosystems without compromising their ecological attributes and functioning.
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Affiliation(s)
- Marco J Cabrerizo
- Department of Ecology, Faculty of Sciences, University of Granada, Campus Fuentenueva, s/n, 18071, Granada, Spain; Centro de Investigación Mariña da Universidade de Vigo (CIM-UVigo), Illa de Toralla s/n, Vigo, 36331, Spain; Department of Ecology and Animal Biology, Faculty of Marine Sciences, University of Vigo, Campus Lagoas Marcosende, Vigo, 36310, Spain.
| | | | - Elizabeth León-Palmero
- Universitary Institute of Water Research, University of Granada, C/ Ramón y Cajal, P. O. 4, 18071, Granada, Spain.
| | - Gerardo Guerrero-Jiménez
- Universitary Institute of Water Research, University of Granada, C/ Ramón y Cajal, P. O. 4, 18071, Granada, Spain.
| | - Lisette N de Senerpont Domis
- Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg, 10, 6708 PB, Wageningen, the Netherlands; Aquatic Ecology and Water Quality Management group, Wageningen University, Wageningen, the Netherlands.
| | - Sven Teurlincx
- Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg, 10, 6708 PB, Wageningen, the Netherlands.
| | - Juan M González-Olalla
- Department of Ecology, Faculty of Sciences, University of Granada, Campus Fuentenueva, s/n, 18071, Granada, Spain.
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