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Limei S, Cai Y, Zhang Y, Liu J, Zhang M, Chen F, Shi X, Yu Y, Li P, Wu QL. Contrasting but interconnecting metatranscriptome between large buoyant and small suspended particles during cyanobacterial blooming in the large shallow eutrophic Taihu Lake. WATER RESEARCH 2024; 267:122539. [PMID: 39378731 DOI: 10.1016/j.watres.2024.122539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 09/25/2024] [Accepted: 09/26/2024] [Indexed: 10/10/2024]
Abstract
Large cyanobacterial colonies as visible particles floating on the water surface provide different microbial niches from small particles suspended in the water column in eutrophic freshwaters. However, functional potential differences among microbes colonizing on these contrasting particles are not well understood. Here, the metatranscriptome of microbes inhabiting these two kinds of particles during cyanobacterial bloom (dominated by Microcystis spp.) was analyzed and compared. Community compositions of active bacteria associated with small suspended particles (SA, aggregates dominated by small cyanobacteria colonies, other algae and detritus, etc.) were much more diverse than those associated with large buoyant cyanobacterial colonies (LA), but functional diversity was not significantly different between them. Transcripts related to phosphorus and nitrogen metabolism from Proteobacteria, and respiration from Bacteroidetes were enriched in LA, whereas many more pathways such as photosynthesis from Cyanobacteria, cofactors, and protein metabolism from all dominant phyla were enriched in SA. Nevertheless, many transcripts were significantly correlated within and between LA and SA. These results indicated interconnection of bacteria between LA and SA. Moreover, many transcripts in SA were significantly correlated with transcripts from cyanobacterial phycobilisome in LA, indicating that bacterial metabolism in SA may influence cyanobacterial biomass in LA. Thus, the prediction of cyanobacterial blooms by bacterial activity in SA may be possible when there is no visible bloom on the water surface.
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Affiliation(s)
- Shi Limei
- Key Laboratory of Lake and Watershed Science for Water Security, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, PR China; University of Chinese Academy of Sciences, Nanjing 211135, PR China.
| | - Yuanfeng Cai
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, PR China
| | - Yuqing Zhang
- Key Laboratory of Lake and Watershed Science for Water Security, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, PR China; University of Chinese Academy of Sciences, Nanjing 211135, PR China
| | - Jiayin Liu
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, PR China
| | - Min Zhang
- Key Laboratory of Lake and Watershed Science for Water Security, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, PR China; University of Chinese Academy of Sciences, Nanjing 211135, PR China
| | - Feizhou Chen
- Key Laboratory of Lake and Watershed Science for Water Security, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, PR China; Sino-Danish Center for Science and Education, University of Chinese Academy of Sciences, Beijing, PR China
| | - Xiaoli Shi
- Key Laboratory of Lake and Watershed Science for Water Security, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, PR China; University of Chinese Academy of Sciences, Nanjing 211135, PR China
| | - Yang Yu
- Key Laboratory of Lake and Watershed Science for Water Security, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, PR China
| | - Pengfu Li
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, PR China
| | - Qinglong L Wu
- Key Laboratory of Lake and Watershed Science for Water Security, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, PR China; Sino-Danish Center for Science and Education, University of Chinese Academy of Sciences, Beijing, PR China; Center for Evolution and Conservation Biology, Southern Marine Sciences and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, PR China; Fuxianhu Research Station for Plateau Deep Lake Ecosystem, Chinese Academy of Sciences, Chengjiang, PR China.
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2
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Li B, Chang C, Sun C, Zhao D, Hu E, Li M. Multi-habitat distribution and coalescence of resistomes at the watershed scale based on metagenomics. JOURNAL OF HAZARDOUS MATERIALS 2024; 477:135349. [PMID: 39068887 DOI: 10.1016/j.jhazmat.2024.135349] [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: 05/07/2024] [Revised: 07/14/2024] [Accepted: 07/26/2024] [Indexed: 07/30/2024]
Abstract
The characteristics of the resistome distribution in rivers have been extensively studied. However, the distribution patterns of resistomes in multiple habitats and contributions of upstream habitats to the resistome profile in water bodies remains unclear. The current study explored the distribution and coalescence of antibiotic resistance genes (ARGs), metal resistance genes (MRGs), and mobile genetic elements (MGEs) in four habitats (including water bodies, sediments, biofilms, and riparian soils) within the Shichuan River watershed. The results revealed significant variations in the abundances and diversity of resistomes across the four habitats and two seasons. Assembly processes of resistomes were predominated by stochastic processes in summer but deterministic processes in winter. The main source of the resistome in summer water bodies was the movement of genes from upstream water bodies. However, the main sources of resistome in downstream water bodies in winter were the movement of resistomes in upstream sediments and the input of external pollution. The physicochemical properties of winter water bodies significantly influenced the movement of the resistomes across habitats. The current study elucidated the multi-habitat distribution pattern and migration mechanism of the resistome in the river system, providing new insights for effectively monitoring and controlling bacterial resistance.
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Affiliation(s)
- Bingcong Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, PR China
| | - Chao Chang
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, PR China
| | - Changshun Sun
- Shaanxi Provincial Academy of Environmental Science, Xi'an 710061, PR China.
| | - Dan Zhao
- Shaanxi Provincial Academy of Environmental Science, Xi'an 710061, PR China
| | - En Hu
- Shaanxi Provincial Academy of Environmental Science, Xi'an 710061, PR China
| | - Ming Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, PR China
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3
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Wang D, Li L, Ning R, Shao Y, Li H, Shi X, Xue Z, Togbah CF, Yu S, Gao N. Satellite Tracking Reveals the Speed Up of the Lacustrine Algal Bloom Drift in Response to Climate Change. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:11727-11736. [PMID: 38836508 DOI: 10.1021/acs.est.4c03391] [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: 06/06/2024]
Abstract
Satellite evidence indicates a global increase in lacustrine algal blooms. These blooms can drift with winds, resulting in significant changes of the algal biomass spatial distribution, which is crucial in bloom formation. However, the lack of long-term, large-scale observational data has limited our understanding of bloom drift. Here, we have developed a novel method to track the drift using multi-source remote sensing satellites and presented a comprehensive bloom drift data set for four typical lakes: Lake Taihu (China, 2011-2021), Lake Chaohu (China, 2011-2020), Lake Dianchi (China, 2003-2021), and Lake Erie (North America, 2003-2021). We found that blooms closer to the water surface tend to drift faster. Higher temperatures and lower wind speeds bring blooms closer to the water surface, therefore accelerating drift and increasing biomass transportation. Under ongoing climate change, algal blooms are increasingly likely to spread over larger areas and accumulate in downwind waters, thereby posing a heightened risk to water resources. Our research greatly improves the understanding of algal bloom dynamics and provides new insights into the driving factors behind the global expansion of algal blooms. Our bloom-drift-tracking methodology also paves the way for the development of high-precision algal bloom prediction models.
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Affiliation(s)
- Denghui Wang
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
- Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, People's Republic of China
| | - Lei Li
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
- Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, People's Republic of China
| | - Rongsheng Ning
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Yisheng Shao
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
- China Academy of Urban Planning & Design, 5 Chegongzhuang West Road, Beijing 100044, People's Republic of China
| | - Huixian Li
- School of Energy and Environment and State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong 999077, People's Republic of China
| | - Xujie Shi
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Zhehua Xue
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
- Power China Eco-environmental Group Company, Limited, Shenzhen, Guangdong 518133, People's Republic of China
| | - Charles Flomo Togbah
- UNEP-Tongji Institute of Environment for Sustainable Development, Shanghai 200092, People's Republic of China
| | - Shuili Yu
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Naiyun Gao
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
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Zhang Y, Yang T, Zhang Y, Xu G, Lorke A, Pan M, He F, Li Q, Xiao B, Wu X. Assessment of in-situ monitoring and tracking the vertical migration of cyanobacterial blooms using LISST-HAB. WATER RESEARCH 2024; 257:121693. [PMID: 38728785 DOI: 10.1016/j.watres.2024.121693] [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: 10/24/2023] [Revised: 04/26/2024] [Accepted: 04/28/2024] [Indexed: 05/12/2024]
Abstract
Cyanobacterial harmful algal blooms (cyanoHABs) are becoming increasingly common in aquatic ecosystems worldwide. However, their heterogeneous distributions make it difficult to accurately estimate the total algae biomass and forecast the occurrence of surface cyanoHABs by using traditional monitoring methods. Although various optical instruments and remote sensing methods have been employed to monitor the dynamics of cyanoHABs at the water surface (i.e., bloom area, chlorophyll a), there is no effective in-situ methodology to monitor the dynamic change of cell density and integrated biovolume of algae throughout the water column. In this study, we propose a quantitative protocol for simultaneously measurements of multiple indicators (i.e., biovolume concentration, size distribution, cell density, and column-integrated biovolume) of cyanoHABs in water bodies by using the laser in-situ scattering and transmissometry (LISST) instrument. The accuracy of measurements of the biovolume and colony size of algae was evaluated and exceeded 95% when the water bloom was dominated by cyanobacteria. Furthermore, the cell density of cyanobacteria was well estimated based on total biovolume and mean cell volume measured by the instrument. Therefore, this methodology has the potential to be used for broader applications, not only to monitor the spatial and temporal distribution of algal biovolume concentration but also monitor the vertical distribution of cell density, biomass and their relationship with size distribution patterns. This provides new technical means for the monitoring and analysis of algae migration and early warning of the formation of cyanoHABs in lakes and reservoirs.
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Affiliation(s)
- Yanxue Zhang
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tiantian Yang
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Yan Zhang
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Gang Xu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Andreas Lorke
- Institute for Environmental Sciences, University of Kaiserslautern-Landau (RPTU), Landau 76829, Germany
| | - Min Pan
- Dianchi Lake Ecosystem Observation and Research Station of Yunnan Province, Kunming Dianchi & Plateau Lakes Institute, Kunming 650228, China
| | - Feng He
- Dianchi Lake Ecosystem Observation and Research Station of Yunnan Province, Kunming Dianchi & Plateau Lakes Institute, Kunming 650228, China
| | - Qingman Li
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Bangding Xiao
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; Dianchi Lake Ecosystem Observation and Research Station of Yunnan Province, Kunming Dianchi & Plateau Lakes Institute, Kunming 650228, China
| | - Xingqiang Wu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; Dianchi Lake Ecosystem Observation and Research Station of Yunnan Province, Kunming Dianchi & Plateau Lakes Institute, Kunming 650228, China.
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5
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Zhang H, Xu Y, Liu X, Ma B, Huang T, Kosolapov DB, Liu H, Guo H, Liu T, Ni T, Zhang X. Different seasonal dynamics, ecological drivers, and assembly mechanisms of algae in southern and northern drinking water reservoirs. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 922:171285. [PMID: 38423304 DOI: 10.1016/j.scitotenv.2024.171285] [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: 12/05/2023] [Revised: 02/05/2024] [Accepted: 02/24/2024] [Indexed: 03/02/2024]
Abstract
The role of environmental factors on the community structure of algae has been intensively studied, but there are few analyses on the assembly mechanism of the algal community structure. Here, changes in the community structure of algae in different seasons, the effects of environmental variables on the algal community structure, and the assembly mechanism of the algal community structure in northern and southern reservoirs were investigated in this study. The study revealed that Bacillariophyta, Cyanophyta, and Chlorophyta were the predominant algal species in the reservoirs, with Bacillariophyta and Cyanophyta exhibiting seasonal outbreaks. Compared to the northern reservoirs, the algal diversity in the southern reservoirs was greater. The diversity and algal community structure could be significantly impacted by variations in water temperature and nitrogen level. According to the ecological model, the interaction among algal communities in reservoirs was primarily cooperation. The key taxa in the northern reservoirs was Aphanizomenon sp., while the outbreak in the southern reservoirs was Coelosphaerium sp. The community formation pattern of reservoirs was stochastic, with a higher degree of explanation observed in the southern reservoirs compared to the northern reservoirs. This study preliminarily explored the assembly mechanism of the algal community, providing a theoretical basis for the control of eutrophication in drinking water reservoirs.
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Affiliation(s)
- Haihan Zhang
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China.
| | - Yue Xu
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Xiang Liu
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Ben Ma
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Tinglin Huang
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China.
| | - Dmitry B Kosolapov
- Papanin Institute for Biology of Inland Waters of Russian Academy of Sciences (IBIW RAS), 109, Borok, Nekouz, Yaroslavl 152742, Russia
| | - Hanyan Liu
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Honghong Guo
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Tao Liu
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Tongchao Ni
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Xiaoli Zhang
- Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains, Xi'an University of Architecture and Technology, Xi'an 710055, China
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Feng G, Cao J, Chen H, Meng XZ, Duan Z. Potential gap in understanding cyanoHABs: Light-dependent morphological variations in colonial cyanobacterium Microcystis. HARMFUL ALGAE 2024; 134:102622. [PMID: 38705618 DOI: 10.1016/j.hal.2024.102622] [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: 01/22/2024] [Revised: 03/01/2024] [Accepted: 03/20/2024] [Indexed: 05/07/2024]
Abstract
Colony formation is a crucial characteristic of Microcystis, a cyanobacterium known for causing cyanobacterial harmful algal blooms (cyanoHABs). It has been observed that as Microcystis colonies grow larger, they often become less densely packed, which correlates with a decrease in light penetration. The objective of this study was to investigate the effects of light limitation on the morphological variations in Microcystis, particularly in relation to the crowded cellular environment. The results indicated that when there was sufficient light (transmittance = 100 %) to support a growth rate of 0.11±0.01 day-1, a significant increase in colony size was found, from 466±15 μm to 1030±111 μm. However, under light limitation (transmittance = 50 % - 1 %) where the growth rate was lower than 0, there was no significant improvement in colony size. Microcystis in the light limitation groups exhibited a loose cell arrangement and even the presence of holes or pores within the colony, confirming the negative correlation between colony size and cell arrangement. This pattern is driven by regional differences in growth within the colony, as internal cells have a significantly lower frequency of division compared to peripheral cells, due to intra-colony self-shading (ICSS). The research demonstrates that Microcystis can adjust its cell arrangement to avoid excessive self-shading, which has implications for predicting and controlling cyanoHABs. These findings also contribute to the understanding of cyanobacterial variations and can potentially inform future research on the diverse phycosphere.
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Affiliation(s)
- Ganyu Feng
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing, Jiangsu 210098, China; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Road, Shanghai 200092, China.
| | - Jun Cao
- National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, 1 Xikang Road, Nanjing, Jiangsu 210098, China
| | - Huaimin Chen
- School of Materials Engineering, Changzhou Vocational Institute of Industry Technology, 28 Mingxinzhong Road, Changzhou 213164, China
| | - Xiang-Zhou Meng
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Road, Shanghai 200092, China
| | - Zhipeng Duan
- College of Environment, Hohai University, 1 Xikang Road, Nanjing, Jiangsu 210098, China
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Cha Y, Kim W, Park Y, Kim M, Son Y, Park W. Antagonistic actions of Paucibacter aquatile B51 and its lasso peptide paucinodin toward cyanobacterial bloom-forming Microcystis aeruginosa PCC7806. JOURNAL OF PHYCOLOGY 2024; 60:152-169. [PMID: 38073162 DOI: 10.1111/jpy.13412] [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: 03/16/2023] [Revised: 10/04/2023] [Accepted: 11/08/2023] [Indexed: 02/17/2024]
Abstract
Superior antagonistic activity against axenic Microcystis aeruginosa PCC7806 was observed with Paucibacter sp. B51 isolated from cyanobacterial bloom samples among 43 tested freshwater bacterial species. Complete genome sequencing, analyzing average nucleotide identity and digital DNA-DNA hybridization, designated the B51 strain as Paucibacter aquatile. Electron and fluorescence microscopic image analyses revealed the presence of the B51 strain in the vicinity of M. aeruginosa cells, which might provoke direct inhibition of the photosynthetic activity of the PCC7806 cells, leading to perturbation of cellular metabolisms and consequent cell death. Our speculation was supported by the findings that growth failure of the PCC7806 cells led to low pH conditions with fewer chlorophylls and down-regulation of photosystem genes (e.g., psbD and psaB) during their 48-h co-culture condition. Interestingly, the concentrated ethyl acetate extracts obtained from B51-grown supernatant exhibited a growth-inhibitory effect on PCC7806. The physical separation of both strains by a filter system led to no inhibitory activity of the B51 cells, suggesting that contact-mediated anti-cyanobacterial compounds might also be responsible for hampering the growth of the PCC7806 cells. Bioinformatic tools identified 12 gene clusters that possibly produce secondary metabolites, including a class II lasso peptide in the B51 genome. Further chemical analysis demonstrated anti-cyanobacterial activity from fractionated samples having a rubrivinodin-like lasso peptide, named paucinodin. Taken together, both contact-mediated inhibition of photosynthesis and the lasso peptide secretion of the B51 strain are responsible for the anti-cyanobacterial activity of P. aquatile B51.
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Affiliation(s)
- Yeji Cha
- Laboratory of Molecular Environmental Microbiology, Department of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Wonjae Kim
- Laboratory of Molecular Environmental Microbiology, Department of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Yerim Park
- Laboratory of Molecular Environmental Microbiology, Department of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Minkyung Kim
- Laboratory of Molecular Environmental Microbiology, Department of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Yongjun Son
- Laboratory of Molecular Environmental Microbiology, Department of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
| | - Woojun Park
- Laboratory of Molecular Environmental Microbiology, Department of Environmental Science and Ecological Engineering, Korea University, Seoul, Republic of Korea
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8
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Wu H, Wu X, Rovelli L, Lorke A. Selection of photosynthetic traits by turbulent mixing governs formation of cyanobacterial blooms in shallow eutrophic lakes. THE ISME JOURNAL 2024; 18:wrae021. [PMID: 38366257 PMCID: PMC10945370 DOI: 10.1093/ismejo/wrae021] [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: 11/02/2023] [Revised: 01/20/2024] [Accepted: 01/31/2024] [Indexed: 02/18/2024]
Abstract
Prediction of the complex cyanobacteria-environment interactions is vital for understanding harmful bloom formation. Most previous studies on these interactions considered specific properties of cyanobacterial cells as representative for the entire population (e.g. growth rate, mortality, and photosynthetic capacity (Pmax)), and assumed that they remained spatiotemporally unchanged. Although, at the population level, the alteration of such traits can be driven by intraspecific competition, little is known about how traits and their plasticity change in response to environmental conditions and affect the bloom formation. Here we test the hypothesis that intraspecific variations in Pmax of cyanobacteria (Microcystis spp.) play an important role in its population dynamics. We coupled a one-dimensional hydrodynamic model with a trait-based phytoplankton model to simulate the effects of physical drivers (turbulence and turbidity) on the Pmax of Microcystis populations for a range of dynamic conditions typical for shallow eutrophic lakes. Our results revealed that turbulence acts as a directional selective driver for changes in Pmax. Depending on the intensity of daily-periodic turbulence, representing wind-driven mixing, a shift in population-averaged phenotypes occurred toward either low Pmax, allowing the population to capture additional light in the upper layers, or high Pmax, enhancing the efficiency of light utilization. Moreover, we observed that a high intraspecific diversity in Pmax accelerated the formation of surface scum by up to more than four times compared to a lower diversity. This study offers insights into mechanisms by which cyanobacteria populations respond to turbulence and underscores the significance of intraspecific variations in cyanobacterial bloom formation. HIGHLIGHTS
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Affiliation(s)
- Huaming Wu
- Institute for Environmental Sciences, University of Kaiserslautern-Landau (RPTU), Landau 76829, Germany
| | - Xingqiang Wu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Lorenzo Rovelli
- Institute for Environmental Sciences, University of Kaiserslautern-Landau (RPTU), Landau 76829, Germany
- Now at the Department of Ecology, Federal Institute of Hydrology (BfG), Koblenz 56068, Germany
| | - Andreas Lorke
- Institute for Environmental Sciences, University of Kaiserslautern-Landau (RPTU), Landau 76829, Germany
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9
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Xiao X, Peng Y, Zhang W, Yang X, Zhang Z, Ren B, Zhu G, Zhou S. Current status and prospects of algal bloom early warning technologies: A Review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 349:119510. [PMID: 37951110 DOI: 10.1016/j.jenvman.2023.119510] [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: 07/26/2023] [Revised: 10/21/2023] [Accepted: 10/31/2023] [Indexed: 11/13/2023]
Abstract
In recent years, frequent occurrences of algal blooms due to environmental changes have posed significant threats to the environment and human health. This paper analyzes the reasons of algal bloom from the perspective of environmental factors such as nutrients, temperature, light, hydrodynamics factors and others. Various commonly used algal bloom monitoring methods are discussed, including traditional field monitoring methods, remote sensing techniques, molecular biology-based monitoring techniques, and sensor-based real-time monitoring techniques. The advantages and limitations of each method are summarized. Existing algal bloom prediction models, including traditional models and machine learning (ML) models, are introduced. Support Vector Machine (SVM), deep learning (DL), and other ML models are discussed in detail, along with their strengths and weaknesses. Finally, this paper provides an outlook on the future development of algal bloom warning techniques, proposing to combine various monitoring methods and prediction models to establish a multi-level and multi-perspective algal bloom monitoring system, further improving the accuracy and timeliness of early warning, and providing more effective safeguards for environmental protection and human health.
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Affiliation(s)
- Xiang Xiao
- College of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
| | - Yazhou Peng
- College of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China.
| | - Wei Zhang
- School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha, 410114, China.
| | - Xiuzhen Yang
- College of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
| | - Zhi Zhang
- Laboratory of Three Gorges Reservoir Region, Chongqing University, Chongqing, 400045, China
| | - Bozhi Ren
- School of Earth Sciences and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China
| | - Guocheng Zhu
- College of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
| | - Saijun Zhou
- College of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China
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10
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Yang H, Wu D, Li H, Hu C. The extracellular polysaccharide determine the physico-chemical surface properties of Microcystis. Front Microbiol 2023; 14:1285229. [PMID: 38125563 PMCID: PMC10732508 DOI: 10.3389/fmicb.2023.1285229] [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: 08/29/2023] [Accepted: 11/10/2023] [Indexed: 12/23/2023] Open
Abstract
Microcystis possesses the capacity to form colonies and blooms in lakes and reservoirs worldwide, causing significant ecological challenges in aquatic ecosystems. However, little is known about the determining factors of physico-chemical surface properties that govern the competitive advantage of Microcystis. Here, The physico-chemical surface properties of Microcystis wesenbergii and Microcystis aeruginosa, including specific surface area (SSA), hydrophobicity, zeta potential, and functional groups were investigated. Additionally, the extracellular polysaccharide (EPS) were analyzed. Laboratory-cultured Microcystis exhibited hydrophilic, a negative zeta potential and negatively charged. Furthermore, no significant relationship was shown between these properties and the cultivation stage. Microcystis wesenbergii exhibited low free energy of cohesion, high surface free energy, high growth rate, and high EPS content during the logarithmic phase. On the other hand, M. aeruginosa displayed lower free energy of cohesion, high surface free energy, high EPS content, and high growth rate during the stationary phase. These characteristics contribute to their respective competitive advantage. Furthermore, the relationship between EPS and surface properties was investigated. The polysaccharide component of EPS primarily influenced the SSA and total surface energy of Microcystis. Likewise, the protein component of EPS influenced hydrophobicity and surface tension. The polysaccharide composition, including glucuronic acid, xylose, and fructose, mainly influenced surface properties. Additionally, hydrophilic groups such as O-H and P-O-P played a crucial role in determining hydrophobicity in Microcystis. This study elucidates that EPS influenced the SSA, hydrophobicity, and surface free energy of Microcystis cells, which in turn impact the formation of Microcystis blooms and the collection.
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Affiliation(s)
- Haijian Yang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Denghua Wu
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Hua Li
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Chunxiang Hu
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
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11
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Cai P, Xu L, Yang J, Tian C, Wu X, Wang C, Xiao B. Differences in survivability and toxic potential among Microcystis colonies of different sizes in sediment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:118916-118927. [PMID: 37919509 DOI: 10.1007/s11356-023-30753-9] [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: 04/26/2023] [Accepted: 10/25/2023] [Indexed: 11/04/2023]
Abstract
Microcystis colonies have the ability to persist for extended periods in sediment and function as a "seed bank" for the succeeding summer bloom in water column. The colonial morphology and toxin production ability of Microcystis are important for their population maintenance and life history. However, it is unclear about the influence of the colony morphology and toxic potential of Microcystis colonies on their benthic process. To address this question, we classified field Microcystis samples into three groups based on their size (< 150 μm, 150-300 μm, and > 300 μm) and compared their survivability and toxic potential during culturing in sediment. The results showed that Microcystis colonies in sediments disappeared quickly at 25℃ but survived for long periods at 5℃. The survivability of smaller Microcystis colonies (< 300 μm) was significantly higher than that of larger ones (> 300 μm). The activities of catalase (CAT) were significantly increased in large colonies compared to small colonies at 15℃ and 25℃. Real-time PCR indicated that smaller colonies had higher proportion of potential toxic genotype, and Microcystis colonies cultured at 15℃ and 25℃ showed higher percentage of microcystin-producing genotype. These results indicate that Microcystis colonies survived longer at low temperature and that larger Microcystis colonies are more susceptible to oxidative stress in sediments. The difference of toxic potential of Microcystis colonies of different sizes in sediments may be related to their survival ability in sediments.
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Affiliation(s)
- Pei Cai
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Lei Xu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jiaojiao Yang
- Dianchi Lake Ecosystem Observation and Research Station of Yunnan Province, Kunming Dianchi & Plateau Lakes Institute, Kunming, 650228, China
| | - Cuicui Tian
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Xingqiang Wu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Chunbo Wang
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
| | - Bangding Xiao
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
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12
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Feng G, Liu J, Li H, Liu JS, Duan Z, Wu L, Gao Y, Meng XZ. Insights from colony formation: The necessity to consider morphotype when assessing the effect of antibiotics on cyanobacteria. WATER RESEARCH 2023; 246:120704. [PMID: 37827036 DOI: 10.1016/j.watres.2023.120704] [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: 07/24/2023] [Revised: 09/26/2023] [Accepted: 10/05/2023] [Indexed: 10/14/2023]
Abstract
Colonial cyanobacteria have been identified as the primary contributor to the global occurrence of cyanobacterial harmful algal blooms (cyanoHABs), which are further intensified by the presence of "pseudo-persistent" antibiotics. Nevertheless, the impact of antibiotics on the growth and size of colonial cyanobacteria remains unclear. In this study, the response of cyanobacterium Microcystis to varying doses of antibiotics was assessed (0, 0.1, 0.5, 1, 10, and 50 μg L-1) by comparing the unicellular and colonial morphotypes. Interestingly, the morphological structure of cyanobacteria plays a significant role in their reaction to antibiotics. In comparison to the unicellular morphotype, the colonial morphotype exhibited a greater promotion in growth rate (11 %-22 %) to low doses of antibiotics and was less inhibited (-121 %--62 %) under high doses. Furthermore, antibiotics may affect the size of cyanobacterial colonies by disrupting the secretion of algal organic matter, which also exhibited a two-phase pattern. This work sheds light on the significance of methodology research involving both unicellular and colonial cyanobacteria. Future research and lake management should prioritize studying the morphological traits of cyanobacteria under different levels of antibiotic exposure. This approach may lead to novel strategies for predicting cyanoHABs under antibiotic pollution more effectively.
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Affiliation(s)
- Ganyu Feng
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Road, Shanghai 200092, China
| | - Jianbin Liu
- Shanghai Qingpu District Environmental Monitoring Station, 15 Xidayinggang Road, Shanghai 201799, China
| | - Hongbo Li
- Beijing ENFI Environmental Protection Co., Ltd., 12 Fuxing Road, Beijing 100038, China
| | - Jin-Song Liu
- College of Advanced Materials Engineering, Jiaxing Nanhu University, 572 South Yuexiu Road, Jiaxing 314001, Zhejiang Province, China
| | - Zhipeng Duan
- College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, Jiangsu Province, China
| | - Liang Wu
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Road, Shanghai 200092, China
| | - Yunze Gao
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Road, Shanghai 200092, China
| | - Xiang-Zhou Meng
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, 1239 Siping Road, Shanghai 200092, China; Jiaxing-Tongji Environmental Research Institute, 1994 Linggongtang Road, Jiaxing 314051, Zhejiang Province, China.
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13
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Wang B, Zhu W, Wu S, Hou H, Cheng L, Xu X, Li Y, Lin X, Xue Z. Distribution and changes in microplastics in Taihu Lake and cyanobacterial blooms formed by the aggregation of Microcystis colonies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:107331-107340. [PMID: 36565424 DOI: 10.1007/s11356-022-24959-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 12/20/2022] [Indexed: 06/17/2023]
Abstract
As a new type of pollutant, microplastics have attracted much attention. As the third largest freshwater lake in China, Taihu Lake is characterized by severe eutrophication caused by external pollution and frequent occurrence of cyanobacterial blooms. Although there have been previous investigations into the spatial distribution of microplastics in Taihu Lake, research on the relationships among microplastics, pollutants, and cyanobacterial blooms, as well as the spatiotemporal distribution and changing characteristics of microplastics, is deficient. This study investigated the characteristics of microplastics, pollutants, and cyanobacterial blooms in the surface water and sediments of Taihu Lake. The abundances of microplastics were 0-3.7 items/L in the surface water and 44.42-417.56 items/kg (dry weight) in the sediments. Microplastics are most abundant in the western, southern, and northern lake areas. The northern and western lake areas are severely polluted, and cyanobacterial blooms are prone to occur in these areas. This study found that microplastics exist in the surface water of the southeastern lake area, which is a source of drinking water, and the microplastics may thus have adverse effects on drinking water quality. As the main organisms in the cyanobacterial blooms, Microcystis and microplastics have similar spatial distributions in Taihu Lake and are both affected by wind. Based on a combination of the investigations of this paper with the existing research on the microplastics in Taihu Lake, the spatiotemporal distribution of microplastics was obtained: the abundance of microplastics in surface water has continuously decreased, there are no obvious spatial distribution differences, and the spatial distribution of microplastics in the sediments is the same as that in the surface water.
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Affiliation(s)
- Bin Wang
- College of Environment, Hohai University, Nanjing, China
| | - Wei Zhu
- College of Environment, Hohai University, Nanjing, China.
- Taihu Lake Research Center, Institute of Water Science and Technology, Hohai University, Nanjing, China.
- College of Civil and Transportation Engineering, Hohai University, Nanjing, China.
| | - Silin Wu
- College of Architecture and Civil Engineering, Jiangsu University of Science and Technology, Zhenjiang, China
- Jiangsu Province Engineering Research Center of Geoenvironmental Disaster Prevention and Remediation, Zhenjiang, China
| | - Hao Hou
- College of Civil and Transportation Engineering, Hohai University, Nanjing, China
| | - Lin Cheng
- College of Environment, Hohai University, Nanjing, China
| | - Xiaoge Xu
- College of Environment, Hohai University, Nanjing, China
| | - Yuehong Li
- College of Environment, Hohai University, Nanjing, China
| | - Xiaowei Lin
- College of Civil and Transportation Engineering, Hohai University, Nanjing, China
| | - Zongpu Xue
- College of Hydrology and Water Resources, Hohai University, Nanjing, China
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14
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Duan Z, Tan X, Shi L, Zeng Q, Ali I, Zhu R, Chen H, Parajuli K. Phosphorus Accumulation in Extracellular Polymeric Substances (EPS) of Colony-Forming Cyanobacteria Challenges Imbalanced Nutrient Reduction Strategies in Eutrophic Lakes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:1600-1612. [PMID: 36642923 DOI: 10.1021/acs.est.2c04398] [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] [Indexed: 06/17/2023]
Abstract
Extracellular polymeric substances (EPS) are crucial for cyanobacterial proliferation; however, certain queries, including how EPS affects cellular nutrient processes and what are the implications for nutrient management in lakes, are not well documented. Here, the dynamics of cyanobacterial EPS-associated phosphorus (EPS-P) were examined both in a shallow eutrophic lake (Lake Taihu, China) and in laboratory experiments with respect to nitrogen (N) and phosphorus (P) availability. Results indicated that 40-65% of the total cyanobacterial aggregate/particulate P presented as EPS-P (mainly labile P and Fe/Al-P). Phosphorus-starved cyanobacteria rapidly replenished their EPS-P pools after the P was resupplied, and the P concentration in this pool was stable for long afterward, although the environmental P concentration decreased dramatically. A low-N treatment enhanced the EPS production alongside two-fold EPS-P accumulation (particularly labile P) higher than the control. Such patterns occurred in the lake where EPS and EPS-P contents were high under N limitation. EPS-P enrichment increased the P content in cyanobacteria; subsequently, it could hold the total P concentration higher for longer and make bloom mitigation harder. The findings outline a new insight into EPS functions in the P process of cyanobacterial aggregates and encourage consideration of both N and P reductions in nutrient management.
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Affiliation(s)
- Zhipeng Duan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
- College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
| | - Xiao Tan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Lin Shi
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Qingfei Zeng
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Imran Ali
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Rui Zhu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Huaimin Chen
- School of Environmental Engineering, Changzhou Institute of Industry Technology, Changzhou 213164, China
| | - Keshab Parajuli
- School of Population and Global Health, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, VIC 3010, Australia
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15
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Deng D, Meng H, Ma Y, Guo Y, Wang Z, He H, Liu JE, Zhang L. Effects of extracellular polymeric substances on the aggregation of Aphanizomenon flos-aquae under increasing temperature. Front Microbiol 2022; 13:971433. [PMID: 36160236 PMCID: PMC9493303 DOI: 10.3389/fmicb.2022.971433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 08/25/2022] [Indexed: 11/26/2022] Open
Abstract
Aphanizomenon flos-aquae (A. flos-aquae) blooms are serious environmental and ecological problems. Extracellular polymeric substances (EPSs) are among the most important indicators for the growth and aggregation of A. flos-aquae. In this study, the secretion of the EPS matrix under temperature rise (7-37°C) was investigated and the role of this matrix in A. flos-aquae aggregation was quantified. First, when the temperature increased, the aggregation ratio increased from 41.85 to 91.04%. Meanwhile, we found that when soluble EPSs (S-EPSs), loosely bound EPSs (LB-EPSs), and tightly bound EPSs (TB-EPSs) were removed successively, the aggregation ratio decreased from 69.29 to 67.45%, 61.47%, and 41.14%, respectively. Second, the content of polysaccharides in the EPS matrix was higher than the content of proteins under temperature change. The polysaccharide in TB-EPSs was closely related to the aggregation ability of A. flos-aquae (P < 0.01). Third, PARAFAC analysis detected two humic-like substances and one protein-like substance in EPSs. Furthermore, Fourier transforms infrared spectroscopy (FTIR) showed that with increasing temperature, the polysaccharide-related functional groups increased, and the absolute value of the zeta potential decreased. In conclusion, these results indicated that a large number of polysaccharides in TB-EPSs were secreted under increasing temperature, and the polysaccharide-related functional groups increased correspondingly, which reduced the electrostatic repulsion between algal cells, leading to the destruction of the stability of the dispersion system, and then the occurrence of aggregation. This helps us to understand the process of filamentous cyanobacterial aggregation in lakes.
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Affiliation(s)
- Dailan Deng
- Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, School of Environment, Nanjing Normal University, Nanjing, China
- Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Nanjing, China
| | - Han Meng
- Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, School of Environment, Nanjing Normal University, Nanjing, China
- Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Nanjing, China
| | - You Ma
- Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, School of Environment, Nanjing Normal University, Nanjing, China
- Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Nanjing, China
| | - Yongqi Guo
- Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, School of Environment, Nanjing Normal University, Nanjing, China
- Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Nanjing, China
| | - Zixuan Wang
- Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, School of Environment, Nanjing Normal University, Nanjing, China
- Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Nanjing, China
| | - Huan He
- Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, School of Environment, Nanjing Normal University, Nanjing, China
- Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Nanjing, China
| | - Jin-e Liu
- Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, School of Environment, Nanjing Normal University, Nanjing, China
- Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Nanjing, China
| | - Limin Zhang
- Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Nanjing, China
- Green Economy Development Institute, Nanjing University of Finance and Economics, Nanjing, China
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16
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Shi L, Cai Y, Gao S, Zhang M, Chen F, Shi X, Yu Y, Lu Y, Wu QL. Gene expression pattern of microbes associated with large cyanobacterial colonies for a whole year in Lake Taihu. WATER RESEARCH 2022; 223:118958. [PMID: 35994786 DOI: 10.1016/j.watres.2022.118958] [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: 05/26/2022] [Revised: 08/05/2022] [Accepted: 08/06/2022] [Indexed: 06/15/2023]
Abstract
Large cyanobacterial colonies, which are unique niches for heterotrophic bacteria, are vital for blooming in eutrophic waters. However, the seasonal dynamics of molecular insights into microbes in these colonies remain unclear. Here, the community composition and metabolism pattern of microbes inhabiting large cyanobacterial colonies (> 120 µm, collected from Lake Taihu in China) were investigated monthly. The community structure of total microbes was mostly influenced by chlorophyll a (Chl a), total phosphorus (TP) concentration, dissolved oxygen, and temperature, whereas the colony-associated bacteria (excluding Cyanobacteria) were mostly influenced by total organic carbon, NO3-, and PO43- concentrations, indicating different response patterns of Cyanobacteria and the associated bacteria to water nutrient conditions. Metatranscriptomic data suggested that similar to that of Cyanobacteria, the gene expression patterns of the most active bacteria, such as Proteobacteria and Bacteroidetes, were not strictly dependent on season but separated by Chl a concentrations. Samples in July and September (high-bloom period) and February and March (non-bloom period) formed two distinct clusters, whereas those of other months (low-bloom period) clustered together. The accumulation of transcripts for pathways, such as phycobilisome from Cyanobacteria and bacterial chemotaxis and flagellum, phosphate metabolism, and sulfur oxidation from Proteobacteria, was enriched in high- and low-bloom periods than in non-bloom period. Network analyses revealed that Cyanobacteria and Proteobacteria exhibited coordinated transcriptional patterns in almost all divided modules. Modules had Cyanobacteria-dominated hub gene were positively correlated with temperature, Chl a, total dissolved phosphorus, and NH4+ and NO2- concentrations, whereas modules had Proteobacteria-dominated hub gene were positively correlated with TP and PO43-. These results indicated labor division might exist in the colonies. This study provided metabolic insights into microbes in large cyanobacterial colonies and would support the understanding and management of the year-round cyanobacterial blooms.
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Affiliation(s)
- Limei Shi
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China.
| | - Yuanfeng Cai
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu Province 210008, China
| | - Shengling Gao
- Biological Experiment Teaching Center, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Min Zhang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China
| | - Feizhou Chen
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China
| | - Xiaoli Shi
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China
| | - Yang Yu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China
| | - Yaping Lu
- Biological Experiment Teaching Center, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Qinglong L Wu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China; Sino-Danish Center for Science and Education, University of Chinese Academy of Sciences, Beijing, China; The Fuxianhu Station of Plateau Deep Lake Research, Chinese Academy of Sciences, Chengjiang, Yunnan Province, China.
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17
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Gu P, Wu H, Li Q, Zheng Z. Effects of suspended solids on cyanobacterial bloom formation under different wind fields. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:47025-47035. [PMID: 35175518 DOI: 10.1007/s11356-022-19231-w] [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: 11/17/2021] [Accepted: 02/10/2022] [Indexed: 06/14/2023]
Abstract
Wind waves and suspended solids (SS) generated by the resuspension of sediments are ubiquitous characteristics of lake ecosystems. However, their effects on phytoplankton remain poorly elucidated in shallow eutrophic lakes. Laboratory experiments were carried out to investigate the responses of Microcystis aeruginosa to SS under static (wind speed of 0 m/s) and breeze (wind speed of 3 m/s) conditions. Results showed that 50 mg/L SS can promote the growth of M. aeruginosa, accelerate the formation of colonies, and increase the floating rate under no-wind conditions. Comparing with static environment, breeze can significantly increase the growth rate of M. aeruginosa and benefit the formation of larger colonies of algae cells. Driven by wind and SS, the buoyancy of the cyanobacteria community in different experimental groups was obviously different. The specific performance was that low SS concentration and breeze were in favor of the floating of cyanobacteria, while high SS concentration went against the floating of algal cells. As a conclusion, wind speed of 3 m/s and 20-50 mg/L SS have a synergistic effect on the formation of cyanobacterial blooms. This study can provide an improved current understanding of bloom formation and turbidity management strategies in shallow eutrophic lakes.
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Affiliation(s)
- Peng Gu
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi, 214122, People's Republic of China
- Taihu Water Environment Research Center, Changzhou, 213169, People's Republic of China
| | - Hanqi Wu
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, People's Republic of China
- Taihu Water Environment Research Center, Changzhou, 213169, People's Republic of China
| | - Qi Li
- College of Ecology and Environment, Chengdu University of Technology, Chengdu, 610059, People's Republic of China.
| | - Zheng Zheng
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, People's Republic of China.
- Taihu Water Environment Research Center, Changzhou, 213169, People's Republic of China.
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18
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Feng G, Zhu W, Duan Z, Zhang Y. The role of morphological changes in Microcystis adaptation to nutrient availability at the colonial level. HARMFUL ALGAE 2022; 115:102235. [PMID: 35623697 DOI: 10.1016/j.hal.2022.102235] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 03/26/2022] [Accepted: 04/06/2022] [Indexed: 06/15/2023]
Abstract
Colony formation is a key trait facilitating the formation of Microcystis blooms. However, the role of morphological changes (e.g., colony size and tightness) in the adaptation to nutrient availability is not fully understood. In this study, we analyzed the morphological changes under both nutrient sufficiency and deficiency. Accordant morphological changes were found with both an isolated colonial strain and mixed field colonies. Colonies that were limited by nutrients became bloated and uncompacted structures, and this change was more pronounced under N deficiency. This looser morphology increased the availability of intra-colony light and relieved the size effect. When nutrients were sufficient, small colonies emerged, which helped to maintain rapid growth (0.32 day-1). Our study highlighted probable role of morphological variations in: (1) diminishing intra-colony self-shading when facing nutrient deficiency; and (2) enlarging the population under high trophic levels by generating daughter colonies. These roles were also verified using field data from Lake Taihu, which further indicated that the seasonal succession of morphospecies was probably the result of adaptive morphological changes. Adaptive morphological changes offer advantages against fluctuations in nutrient availability, which should be considered when attempting to restrain bloom formation.
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Affiliation(s)
- Ganyu Feng
- College of Environment, Hohai University, Nanjing, Jiangsu 210098, China; Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, Jiangsu 210098, China
| | - Wei Zhu
- College of Environment, Hohai University, Nanjing, Jiangsu 210098, China.
| | - Zhipeng Duan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, Jiangsu 210098, China; College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
| | - Yu Zhang
- College of Environment, Hohai University, Nanjing, Jiangsu 210098, China
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Li J, Li Y, Bi S, Xu J, Guo F, Lyu H, Dong X, Cai X. Utilization of GOCI data to evaluate the diurnal vertical migration of Microcystis aeruginosa and the underlying driving factors. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 310:114734. [PMID: 35220103 DOI: 10.1016/j.jenvman.2022.114734] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/20/2022] [Accepted: 02/13/2022] [Indexed: 06/14/2023]
Abstract
Cyanobacterial blooms are one of the most severe ecological problems affecting lakes. The vertical migration of cyanobacteria in the water column increases the uncertainty in the formation and disappearance of blooms, which may be closely associated with light, temperature, and wind speed. However, it is difficult to quantitatively evaluate the influencing factors of cyanobacteria vertical movement in natural environment compared to the laboratory experimental environment. Besides, both field survey and laboratory experiment method have the difficulties in determining the diurnal vertical migration of cyanobacteria at the synoptic lake scale. In this study, based on the diurnal dynamics of cyanobacterial bloom intensity (CBI) observed by the Geostationary Ocean Color Imager (GOCI) from 2011 to 2019, the daily variations, floating rate, and sinking rate of Microcystis aeruginosa were calculated in the natural environment. Then, the effects of light, temperature, and wind speed on the vertical migration of M. aeruginosa were analysed from the perspectives of day, night, and season. The results are as follows: the records of three typical patterns of diurnal CBI exhibited strong seasonal variability from the 9-year statistics; at night, the buoyancy recovery rate of cyanobacterial colonies increased with temperature, so that at temperature >15 °C and wind speed <3 m s-1, CBI reached the maximum of the whole day at 08:16; the sinking rate of M. aeruginosa was positively correlated with the cumulated light energy at both synoptic and pixel scale; the upward migration speed of M. aeruginosa was positively correlated with the maximum wind speed of the day before cyanobacterial bloom. Therefore, the severer cyanobacterial blooms were often observed by satellite images after strong winds. The analysis of diurnal variation, floating rate, and sinking rate of M. aeruginosa will expand our knowledge for further understanding the formation mechanism of cyanobacterial blooms and for improving the accuracy of model simulation to predict the hourly changes in cyanobacterial blooms in Lake Taihu.
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Affiliation(s)
- Junda Li
- Key Laboratory of Virtual Geographic Environment of Education Ministry, Nanjing Normal University, Nanjing, 210023, PR China
| | - Yunmei Li
- Key Laboratory of Virtual Geographic Environment of Education Ministry, Nanjing Normal University, Nanjing, 210023, PR China; Jiangsu Center for Collaboration Invocation in Geographical Information Resource Development and Application, Nanjing, 210023, PR China
| | - Shun Bi
- Key Laboratory of Virtual Geographic Environment of Education Ministry, Nanjing Normal University, Nanjing, 210023, PR China; Jiangsu Center for Collaboration Invocation in Geographical Information Resource Development and Application, Nanjing, 210023, PR China; Institute of Carbon Cycles, Helmholtz-Zentrum Hereon, 21502, Geesthacht, Germany
| | - Jie Xu
- Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center, Yangtze River Basin Ecological Environment Supervision and Administration Bureau, Ministry of Ecological Environment, Wuhan, 430010, China
| | - Fei Guo
- Key Laboratory of Virtual Geographic Environment of Education Ministry, Nanjing Normal University, Nanjing, 210023, PR China; Jiangsu Center for Collaboration Invocation in Geographical Information Resource Development and Application, Nanjing, 210023, PR China.
| | - Heng Lyu
- Key Laboratory of Virtual Geographic Environment of Education Ministry, Nanjing Normal University, Nanjing, 210023, PR China; Jiangsu Center for Collaboration Invocation in Geographical Information Resource Development and Application, Nanjing, 210023, PR China
| | - Xianzhang Dong
- Key Laboratory of Virtual Geographic Environment of Education Ministry, Nanjing Normal University, Nanjing, 210023, PR China
| | - Xiaolan Cai
- Key Laboratory of Virtual Geographic Environment of Education Ministry, Nanjing Normal University, Nanjing, 210023, PR China
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20
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Zeng S, Lei S, Li Y, Lyu H, Dong X, Li J, Cai X. Remote monitoring of total dissolved phosphorus in eutrophic Lake Taihu based on a novel algorithm: Implications for contributing factors and lake management. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 296:118740. [PMID: 34971740 DOI: 10.1016/j.envpol.2021.118740] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 12/20/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
Understanding the spatiotemporal dynamics of total dissolved phosphorus concentration (CTDP) and its regulatory factors is essential to improving our understanding of its impact on inland water eutrophication, but few studies have assessed this in eutrophic inland lakes due to a lack of suitable bio-optical algorithms allowing the use of remote sensing data. We developed a novel semi-analytical algorithm for this purpose and tested it in the eutrophic Lake Taihu, China. Our algorithm produced robust results with a mean absolute square percentage error of 29.65% and root mean square error of 9.54 μg/L. Meanwhile, the new algorithm demonstrates good portability to other waters with different optical properties and could be applied to various image data, including Moderate Resolution Imaging Spectroradiometer (MODIS), Medium Resolution Imaging Spectrometer (MERIS), and Ocean and Land Color Instrument (OLCI). Further analysis based on Geostationary Ocean Color Imager observations from 2011 to 2020 revealed a significant spatiotemporal heterogeneity of CTDP in Lake Taihu. Correlation analysis of the long-term trend between CTDP and driving factors demonstrated that air temperature is the dominant regulating factor in variations of CTDP. This study provides a novel algorithm allowing remote-sensing monitoring of CTDP in eutrophic lakes and can lead to new insights into the role of dissolved phosphorus in water eutrophication.
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Affiliation(s)
- Shuai Zeng
- School of Geography, Nanjing Normal University, Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China
| | - Shaohua Lei
- State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing, 210029, China
| | - Yunmei Li
- School of Geography, Nanjing Normal University, Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China.
| | - Heng Lyu
- School of Geography, Nanjing Normal University, Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China
| | - Xianzhang Dong
- School of Geography, Nanjing Normal University, Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China
| | - Junda Li
- School of Geography, Nanjing Normal University, Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China
| | - Xiaolan Cai
- School of Geography, Nanjing Normal University, Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing, 210023, China
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21
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Zeng S, Du C, Li Y, Lyu H, Dong X, Lei S, Li J, Wang H. Monitoring the particulate phosphorus concentration of inland waters on the Yangtze Plain and understanding its relationship with driving factors based on OLCI data. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 809:151992. [PMID: 34883171 DOI: 10.1016/j.scitotenv.2021.151992] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/20/2021] [Accepted: 11/22/2021] [Indexed: 06/13/2023]
Abstract
Tracking the spatiotemporal dynamics of particulate phosphorus concentration (CPP) and understanding its regulating factors is essential to improve our understanding of its impact on inland water eutrophication. However, few studies have assessed this in eutrophic inland lakes, owing to a lack of suitable bio-optical algorithms allowing the use of remote sensing data. Herein, a novel semi-analytical algorithm of CPP was developed to estimate CPP in lakes on the Yangtze Plain, China. The independent validations of the proposed algorithm showed a satisfying performance with the mean absolute percentage error and root mean square error less than 27% and 27 μg/L, respectively. The Ocean and Land Color Instrument observations revealed a remarkable spatiotemporal heterogeneity of CPP in 23 lakes on the Yangtze Plain from 2016 to 2020, with the lowest value in December (62.91 ± 34.59 μg/L) and the highest CPP in August (114.9 ± 51.69 μg/L). Among the 23 examined lakes, the highest mean CPP was found in Lake Poyang (124.58 ± 44.71 μg/L), while the lowest value was found in Lake Qiandao (33.51 ± 4.71 μg/L). Additionally, 13 lakes demonstrated significant decreasing or increasing trends (P < 0.05) of annual mean CPP during the observation period. The driving factor analysis revealed that four natural factors (wind speed, air temperature, precipitation, and sunshine duration) and two anthropogenic factors (the normalized difference vegetation index and nighttime light) combined explained more than 91% of the variation in CPP, while the impacts of these factors on CPP showed considerable differences among lakes. This study offered a novel and scalable algorithm for the study of the spatiotemporal variation of CPP in inland waters and provided new insights into the regulating factors in water eutrophication.
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Affiliation(s)
- Shuai Zeng
- School of Geography, Nanjing Normal University, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
| | - Chenggong Du
- Jiangsu Collaborative Innovation Center of Regional Modern Agriculture & Environmental Protection, Huaiyin Normal University, Huaian, China; Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake, Huaiyin Normal University, Huaian, China
| | - Yunmei Li
- School of Geography, Nanjing Normal University, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China.
| | - Heng Lyu
- School of Geography, Nanjing Normal University, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
| | - Xianzhang Dong
- School of Geography, Nanjing Normal University, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
| | - Shaohua Lei
- State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
| | - Junda Li
- School of Geography, Nanjing Normal University, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
| | - Huaijing Wang
- School of Geography, Nanjing Normal University, China; Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, China; Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
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22
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Zhang J, Huang Z, Gao L, Gray S, Xie Z. Study of MOF incorporated dual layer membrane with enhanced removal of ammonia and per-/poly-fluoroalkyl substances (PFAS) in landfill leachate treatment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:151207. [PMID: 34728199 DOI: 10.1016/j.scitotenv.2021.151207] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 10/19/2021] [Accepted: 10/21/2021] [Indexed: 05/26/2023]
Abstract
Landfill leachate is a highly polluted and complex wastewater as it contains large amounts of organic matters, ammonia‑nitrogen, heavy metals, and per-/poly-fluoroalkyl substances (PFAS), which makes its treatment very challenging. In this paper, hydrophilic/hydrophobic dual layer membranes combining advantages of pervaporation and membrane distillation was employed to treat leachate in a direct contact membrane distillation (DCMD) configuration. An aluminum fumarate (AlFu) metal organic framework (MOF) incorporated poly(vinyl alcohol) (PVA) hydrophilic layer was coated on hydrophobic PTFE membrane to overcome the low separation efficiency of PFAS and ammonia and wetting issues encountered by the conventional hydrophobic PTFE membrane used for DCMD. The rejections of dual layer membranes with different MOF loading to PFAS, ammonia, TOC and TDS were assessed based on the amount of AlFu MOF incorporated into the PVA layer. Based on the conducted adsorption tests, it was found that AlFu MOF increases the rejection of PVA layer to PFAS and ammonia. The coating of the hydrophilic layer could enhance the wetting resistance with/without MOF addition. In comparison with the pristine PTFE membrane using synthetic feed containing 3 wt% NaCl, 1 wt% addition of AlFu MOF into the PVA layer showed slightly increased flux. All the tested membranes showed more than 99% rejection to TOC. The rejection to ammonia was increased as more MOF was incorporated into the PVA layer. The maximum rejection of ammonia was 99.8% when the PVA layer containing 10% MOF. All the membranes showed more than 99% rejection to PFOS and PFHxS. However, PTFE membrane did not show any rejection to PFOA. As more MOF was added into the hydrophilic layer, the rejection to PFOA increased, but plateaued at 65.6% with 5% MOF incorporation into the hydrophilic layer.
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Affiliation(s)
- Jianhua Zhang
- Institute for Sustainable Industries and Liveable Cities, Victoria University, PO Box 14428, Melbourne, Vic. 8001, Australia.
| | - Zhen Huang
- CSIRO Manufacturing, Private Bag 10, Clayton South, Vic. 3169, Australia
| | - Li Gao
- South East Water Corporation, PO Box 2268, Seaford, Victoria 3198, Australia
| | - Stephen Gray
- Institute for Sustainable Industries and Liveable Cities, Victoria University, PO Box 14428, Melbourne, Vic. 8001, Australia
| | - Zongli Xie
- CSIRO Manufacturing, Private Bag 10, Clayton South, Vic. 3169, Australia
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23
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Feng W, Liu Y, Gao L. Stormwater treatment for reuse: Current practice and future development - A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 301:113830. [PMID: 34600425 DOI: 10.1016/j.jenvman.2021.113830] [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: 01/28/2021] [Revised: 08/18/2021] [Accepted: 09/22/2021] [Indexed: 06/13/2023]
Abstract
Stormwater harvesting is an effective measure to mitigate flooding risk and pollutant migration in our urban environment with the continuously increasing impermeable faction. Treatment of harvested stormwater also provides the fit-for-purpose water sources as an alternative to potable water supply ensuring the reliability and sustainability of the water management in the living complex. In order to provide the water management decision-maker with a broad range of related technology database and to facilitate the implementation of stormwater harvesting in the future, a comprehensive review was undertaken to understand the corresponding treatment performance, the applicable circumstances of current stormwater treatment and harvesting technologies. Technologies with promising potential for stormwater treatment were also reviewed to investigate the feasibility of being used in an integrated process. The raw stormwater quality and the required quality for different levels of stormwater reuses (irrigation, recreational, and potable) were reviewed and compared. The required level of treatment is defined for different 'fit-for-purpose' uses of harvested stormwater. Stormwater biofilter and constructed wetland as the two most advanced and widely used stormwater harvesting and treatment technologies, their main functionality, treatment performance and adequate scale of the application were reviewed based on published peer-reviewed articles and case studies. Excessive microbial effluent that exists in stormwater treated using these two technologies has restricted the stormwater reuse in most cases. Water disinfection technologies developed for wastewater and surface water treatment but with high potential to be used for stormwater treatment have been reviewed. Their feasibility and limitation for stormwater treatment are presented with respect to different levels of fit-for-purpose reuses. Implications for future implementation of stormwater treatment are made on proposing treatment trains that are suitable for different fit-for-purpose stormwater reuses.
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Affiliation(s)
- Wenjun Feng
- Department of Chemical Engineering, Monash University, Clayton, VIC, 3800, Australia
| | - Yue Liu
- Department of Chemical Engineering, Monash University, Clayton, VIC, 3800, Australia
| | - Li Gao
- Institute of Sustainability and Innovation, Victoria University, PO Box 14428, Melbourne, Victoria, 8001, Australia; South East Water Corporation, Seaford, VIC, 3198 Australia.
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24
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Ma X, Li M, Jiang E, Pan B, Gao L. Humic acid inhibits colony formation of the cyanobacterium Microcystis at high level of iron. CHEMOSPHERE 2021; 281:130742. [PMID: 34000652 DOI: 10.1016/j.chemosphere.2021.130742] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 04/19/2021] [Accepted: 04/24/2021] [Indexed: 06/12/2023]
Abstract
Colony formation is a key process for the occurrence of Microcystis blooms. In order to inhibit colony formation of Microcystis at high level of iron using humic acid, unicellular Microcystis aeruginosa was cultivated in laboratory treated with varying concentrations of iron and humic acid. Our results showed that the extracellular polysaccharides (EPS) content and average colony size increased from 0.57 pg cells-1 and 4.0 μm to 0.93 pg cells-1 and 26.1 μm, respectively, while iron concentration increased from 0.68 mg L-1 to 6.8 mg L-1, suggesting that high level of iron stimulated EPS secretion and induced unicellular Microcystis to form colonies. Transcriptome analysis showed that two genes described as glycosyltransferases (BH695-2217 and BH695-3696) were significantly up-regulated while EPS content increased with increasing iron concentration indicating that iron may regulate the expression of genes involved in polysaccharide synthesis. When treated with 10 mg C L-1 humic acid at high level of iron, the EPS content and average colony size decreased by 35.5% and 56.3%, respectively, revealing that humic acid inhibited EPS secretion under high level of iron condition, and ultimately inhibited colony formation of Microcystis. Our results suggested that humic acid could be used as an agentia inhibiting large colony formation of Microcystis and thereby reducing the occurrence of Microcystis blooms.
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Affiliation(s)
- Xiao Ma
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, PR China
| | - Ming Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, PR China.
| | - Enli Jiang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, PR China
| | - Baozhu Pan
- State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi'an, 710048, Shaanxi, China
| | - Li Gao
- Institute for Sustainable Industries and Liveable Cities, Victoria University, PO Box 14428, Melbourne, Victoria, 8001, Australia
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25
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Wu H, Wu X, Yang T, Wang C, Tian C, Xiao B, Lorke A. Feedback regulation of surface scum formation and persistence by self-shading of Microcystis colonies: Numerical simulations and laboratory experiments. WATER RESEARCH 2021; 194:116908. [PMID: 33596491 DOI: 10.1016/j.watres.2021.116908] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2020] [Revised: 01/31/2021] [Accepted: 02/02/2021] [Indexed: 06/12/2023]
Abstract
Light availability is an important driver of algal growth and for the formation of surface blooms. The formation of Microcystis surface scum decreases the transparency of the water column and influences the vertical distribution of light intensity. Only few studies analysed the interactions between the dynamics of surface blooms and the light distribution in the water column. Particularly the effect of light attenuation caused by Microcystis colonies (self-shading) on the formation of surface scum has not been explored. In the present study, we simulate the effect of variable cell concentration of Microcystis colonies on the vertical distribution of light in the water column based on experimental estimates of the extinction coefficient of Microcystis colonies. The laboratory observations indicated that higher cell concentration of Microcystis enhance the light attenuation in water column and promotes surface scum formation. We extended an existing model for the light-driven migration of Microcystis by introducing the effect of self-shading and simulated the dynamics of vertical migration for different cell concentrations and different colonial morphologies. The simulation results show that high cell concentrations of Microcystis promote surface scum formation, as well as its persistence throughout diel photoperiods. Large and tight Microcystis colonies facilitate scum formation, while small and loose colonies increase scum stability and persistence. This study reveals a positive feedback regulation of Microcystis surface scum formation and stability by self-shading and provides novel insights into the underlying mechanisms.
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Affiliation(s)
- Huaming Wu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xingqiang Wu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
| | - Tiantian Yang
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chunbo Wang
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Cuicui Tian
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Bangding Xiao
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Andreas Lorke
- Institute for Environmental Sciences, University of Koblenz-Landau, Landau 76829, Germany
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26
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Chen C, Wang Y, Chen K, Shi X, Yang G. Using hydrogen peroxide to control cyanobacterial blooms: A mesocosm study focused on the effects of algal density in Lake Chaohu, China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 272:115923. [PMID: 33139095 DOI: 10.1016/j.envpol.2020.115923] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 10/19/2020] [Accepted: 10/22/2020] [Indexed: 06/11/2023]
Abstract
The application of hydrogen peroxide (H2O2) to control harmful algal blooms is affected by algal density and species. In the present study, a simulation field study was carried out to evaluate the removal of cyanobacteria with high algal density (chlorophyll a of approximately 220-250 μg/L) and low algal density (chlorophyll a of approximately 30-50 μg/L) using 10, 20 mg/L H2O2 and 5 mg/L H2O2. The dynamics of algal biomass, nutrients, microcystins, phytoplankton, and zooplankton were measured within 7 d. The results showed that 5 mg/L H2O2 effectively eliminated algal biomass (measured as chlorophyll a and phycocyanin) and inhibited 50% of the photosynthetic activity of the cyanobacteria at 7 d in the low algal cell density group, while the same inhibition rate was observed in the high algal cell density group when the H2O2 was 20 mg/L. However, using a high dosage of H2O2, such as 10 mg/L, to suppress cyanobacteria with high biomass could result in a dramatic increase in nutrients and microcystins in the water column. The portion of eukaryotic algae, such as Chlorophyta, Bacillariophyta and Euglenophyta, in the phytoplankton community increased with increasing H2O2 concentrations; moreover, the dominant species of cyanobacteria changed from the nontoxic genus Dactylococcopsis to the toxic genus Oscillatoria, which may result in acute toxicity to zooplankton. Our results demonstrated that the application of H2O2 to control cyanobacterial blooms at the early stage when algal cell density was low posed less potential ecological risks and may have increased the diversity of the phytoplankton community.
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Affiliation(s)
- Chao Chen
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, China
| | - Yiyao Wang
- Chengdu Environmental Protection Research Institute, Chengdu, 610072, China
| | - Kaining Chen
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Xiaoli Shi
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
| | - Gang Yang
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, China.
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27
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Cai Y, Luo X, He X, Tang C. Primary role of increasing urea-N concentration in a novel Microcystis densa bloom: Evidence from ten years of field investigations and laboratory experiments. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 208:111713. [PMID: 33396044 DOI: 10.1016/j.ecoenv.2020.111713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Revised: 11/19/2020] [Accepted: 11/20/2020] [Indexed: 06/12/2023]
Abstract
A novel Microcystis bloom caused by Microcystis densa has occurred in a typical subtropical reservoir every spring and summer since 2012, and it has caused several ecological and economic losses. To determine the environmental factors that influence the growth and physiological characteristics of M. densa, we investigated the variations in physicochemical factors and M. densa cell density from 2007 to 2017. The results showed that the urea-N concentration increased significantly (from 0.02 ± 0.00-0.20 ± 0.01 mg N l-1), whereas other factors did not vary significantly. NO3--N and urea-N concentrations were higher than the NH4+-N concentration during the M. densa bloom. The nitrogen composition changed, and urea-N and NO3--N became a major nitrogen sources in the reservoir. Water temperature and increased urea-N concentrations were the primary factors that influenced variations in M. densa cell density (45.5%, p < 0.05). Laboratory experiments demonstrated that M. densa cultured with urea-N exhibited a higher maximum cell density (9.8 ± 0.5 × 108 cells l-1), more cellular pigments for photosynthesis (chlorophyll a and phycocyanin) and photoprotection (carotenoid), and more proteins than those cultured with NH4+-N and NO3--N. These results suggested that M. densa cultured with urea-N exhibited preferable growth and physiological conditions. Moreover, M. densa exhibited an increased maximum specific uptake rate (0.93 pg N cell-1 h-1) and reduced half-saturation constant (0.03 mg N l-1) for urea-N compared with NH4+-N and NO3--N, suggesting that M. densa preferred urea-N as its major nitrogen source. These results collectively indicated that the increasing urea-N concentration was beneficial for the growth and physiological conditions of M. densa. This study provided ten years of field data and detailed physiological information supporting the critical effect of urea-N on the growth of a novel bloom species M. densa. These findings helped to reveal the mechanism of M. densa bloom formation from the perspective of dissolved organic nitrogen.
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Affiliation(s)
- Yangyang Cai
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, China
| | | | - Xiaoyuan He
- South China Sea Administration, Ministry of Natural Resources, Guangzhou, China
| | - Changyuan Tang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, China; School of Geography and Planning, Sun Yat-sen University, Guangzhou, China.
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28
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Tan X, Duan Z, Duan P, Parajuli K, Newman J, Shu X, Zhang D, Gao L, Li M. Flocculation of Microcystis unicells induced by pH regulation: Mechanism and potential application. CHEMOSPHERE 2021; 263:127708. [PMID: 33296998 DOI: 10.1016/j.chemosphere.2020.127708] [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: 01/20/2020] [Revised: 07/01/2020] [Accepted: 07/11/2020] [Indexed: 06/12/2023]
Abstract
In water treatment process, Microcystis colonies can be effectively removed by coagulants. However, the use of popular coagulants could cause adverse health effects in humans or increase the amount of sludge. Meanwhile, Microcystis unicells are much more difficult to remove than colonies, due to their small size and dispersed distribution. This study proposed and analyzed the flocculation of Microcystis unicells induced by pH regulation. The particle size, zeta potential, cell viability and integrity, cytochemical changes, and cell-to-cell connections were recorded during pH regulation. Results showed that when pH was adjusted in the range of 2.5 to 2 by HCl (1.2 M), Microcystis unicells aggregated to form flocs as large as 28 μm, which are easy to remove by filtration or sedimentation. The overwhelming majority of cells were intact and inactivated in the optimal pH range (2.5-2). Thus, pH regulation is an environment-friendly and cost-effective method to remove Microcystis unicells, which can be potentially applied to water treatment.
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Affiliation(s)
- Xiao Tan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China.
| | - Zhipeng Duan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Pengfei Duan
- Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project, Nanyang, 473061, China
| | - Keshab Parajuli
- School of Population and Global Health, Faculty of Medicine, Denistry and Health Sciences, The University of Melbourne, VIC, 3010, Australia
| | - Jeffrey Newman
- School of Civil Environment & Mining Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Xiaoqian Shu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Danfeng Zhang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China
| | - Li Gao
- South East Water, 101 Wells Street, Frankston, VIC, 3199, Australia
| | - Ming Li
- Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project, Nanyang, 473061, China; College of Resources and Environment, Northwest A & F University, Yangling, 712100, China.
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Li M, Yu R, Cao Z, Jin Y, Sun H, Qi Z. Analysis of optimal environmental conditions for Microcystis blooms in large, shallow, eutrophic lakes. ALL LIFE 2021. [DOI: 10.1080/26895293.2021.1919569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- Meixia Li
- Inner Mongolia Key Laboratory of River and Lake Ecology & Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, School of Ecology and Environment, Inner Mongolia University, Hohhot, People’s Republic of China
| | - Ruihong Yu
- Inner Mongolia Key Laboratory of River and Lake Ecology & Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, School of Ecology and Environment, Inner Mongolia University, Hohhot, People’s Republic of China
| | - Zhengxu Cao
- Inner Mongolia Key Laboratory of River and Lake Ecology & Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, School of Ecology and Environment, Inner Mongolia University, Hohhot, People’s Republic of China
| | - Ye Jin
- Inner Mongolia Key Laboratory of River and Lake Ecology & Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, School of Ecology and Environment, Inner Mongolia University, Hohhot, People’s Republic of China
| | - Heyang Sun
- Inner Mongolia Key Laboratory of River and Lake Ecology & Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, School of Ecology and Environment, Inner Mongolia University, Hohhot, People’s Republic of China
| | - Zhen Qi
- Inner Mongolia Key Laboratory of River and Lake Ecology & Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, School of Ecology and Environment, Inner Mongolia University, Hohhot, People’s Republic of China
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Chen H, Zhu Y, Zhang Y, Chen X, Wang R, Zhu W. Cyanobacterial bloom expansion caused by typhoon disturbance in Lake Taihu China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:42294-42303. [PMID: 32424759 DOI: 10.1007/s11356-020-09292-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 05/13/2020] [Indexed: 06/11/2023]
Abstract
It remains unclear why the area of a cyanobacterial bloom increases in a shallow lake after a typhoon passes. In this study, the mechanisms of cyanobacterial bloom expansion were investigated by studying meteorological factors, water quality, algal biomass, and bloom area in Lake Taihu before and after typhoons (2007-2016). Our results showed that typhoon-induced sediment resuspension caused a short-term increase in nutrients, but nutrients returned to pre-typhoon levels after the typhoon passages. The short-term nutrient release during a typhoon did not result in an obvious increase in Microcystis cell density in two bays of Lake Taihu (Gonghu and Meiliang). Under strong winds, Microcystis aggregates were uniformly distributed in the water column downwind and then dispersed into different directions by wind-driven currents. In particular, Microcystis in the surface water were transported to the center of Lake Taihu. After a typhoon, dispersed Microcystis refloated and formed blooms. Thus, the bloom area was enlarged compared with before a typhoon. Several days after a typhoon, the bloom area gradually reduced as a result of a steady breeze on the horizontal accumulation of Microcystis.
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Affiliation(s)
- Huaimin Chen
- College of Environment, Hohai University, No. 1 Xikang Road, Nanjing, 210098, People's Republic of China
| | - Yuyang Zhu
- School of Civil Engineering, Advanced Engineering Building, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Yong Zhang
- Jiangsu Environmental Monitoring Center, No. 100 Zhonghe Road, Nanjing, 210019, People's Republic of China
| | - Xuqing Chen
- Wuxi Blue Algae Treatment Office, No. 288 Yunhe East Road, Wuxi, 214071, People's Republic of China
| | - Ruochen Wang
- College of Environment, Hohai University, No. 1 Xikang Road, Nanjing, 210098, People's Republic of China
| | - Wei Zhu
- College of Environment, Hohai University, No. 1 Xikang Road, Nanjing, 210098, People's Republic of China.
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31
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Wu H, Yang T, Wang C, Tian C, Donde OO, Xiao B, Wu X. Co-regulatory role of Microcystis colony cell volume and compactness in buoyancy during the growth stage. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:42313-42323. [PMID: 32651788 DOI: 10.1007/s11356-020-08250-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 02/26/2020] [Indexed: 06/11/2023]
Abstract
The buoyancy of Microcystis colonies determines the occurrence and dominance of bloom on the water surface. Besides the cell density regulation and the formation of larger size aggregates, increases in cell volume per colony (Vcell) and the colony's compactness (i.e., volume ratio of cells to the colony, VR) may promote Microcystis colony buoyancy. Yet only a few studies have studied the relationship between the internal structure variation of colonies and their buoyancy, and the co-regulatory role of Vcell and VR of Microcystis colonies in the floating velocity (FV) remains largely unexplored. In the present study, we optimized a method for measuring the compactness of Microcystis colonies based on the linear relationship between total Vcell and chlorophyll a. Different relationships between the VRs and FVs were observed with different colony size and Vcell range groups. Both field and laboratory experiments showed that FV/(D50, median diameter)2 had a significant linear relationship with VR, indicating that the cell density and extracellular polysaccharides were unchanged over a short time period and could be estimated via the slope and intercept of a fitted line. We also constructed a functional relationship between FV, VR, and Vcell and found that high VR and Vcell can promote Microcystis buoyancy. This means that increasing cell compactness or Vcell may be an active regulation strategy for Microcystis colonies to promote buoyancy. Therefore, quantifying the internal structure of Microcystis colonies is strongly recommended for the assessment of Microcystis bloom development and their management. Graphical abstract.
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Affiliation(s)
- Huaming Wu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tiantian Yang
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chunbo Wang
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Cuicui Tian
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Oscar Omondi Donde
- Department of Environmental Science, Egerton University, P.O. Box, Egerton-Nakuru, 536-20115, Kenya
| | - Bangding Xiao
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
| | - Xingqiang Wu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
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32
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Li L, Jing XL, Wang L, Zeng ZG, Chen WH, Zhai JH, Qi SQ. The extract of aquatic macrophyte Carex cinerascens induced colony formation in bloom-forming cyanobacterium Microcystis aeruginosa. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:42276-42282. [PMID: 32266623 DOI: 10.1007/s11356-020-08651-1] [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: 07/18/2019] [Accepted: 03/27/2020] [Indexed: 06/11/2023]
Abstract
Colony formation in Microcystis aeruginosa played important roles in blooms formation. To study the effects of plant allelopathy on colony formation in M. aruginosa, unicellular M. aeruginosa was cultivated under laboratory conditions treated with various extract concentration of Carex cinerascens. The growth of M. aeruginosa in the treatments with 0.05 and 0.1 mg L-1 extract of C. cinerascens was promoted but the growth in the treatments with 1.5, 3.0, and 6.0 mg L-1 C. cinerascens extract was inhibited. Obvious colony formation in M. aeruginosa was observed in all treatments while no colony formation was detected in the control. The cell number per colony at the first day was the largest and decreased along with culture time. The cell number per colony in the control ranged from 3.0 to 4.0 during the experiment. However, the values in the five treatments at the first day were 33, 80, 58, 41, and 30, respectively. A positive exponential relationship between cell number per colony of M. aeruginosa and extracellular polysaccharides (EPS) content was found as well. Compared the fold-increase in cell number per colony and the fold-increase in total biomass of M. aeruginosa at various day, it was found that colony formation induced by extract of C. cinerascens was primarily dependent on promotion of cell adhesion during the first 2 days. The cell number per colony decreased afterward was due to the increasing proportion of single cells in the culture because single cells had a great higher growth rate than M. aeruginosa colonies under culture condition. Our results suggested that plant allelopathy be one of the major factor contributing to colony formation in M. aeruginosa.
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Affiliation(s)
- Lin Li
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022, People's Republic of China.
- School of Geography and Environment, Jiangxi Normal University, Nanchang, 330022, People's Republic of China.
| | - Xiao-Ling Jing
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
- School of Geography and Environment, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
| | - Ling Wang
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
- School of Geography and Environment, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
| | - Zhi-Gao Zeng
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
- School of Geography and Environment, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
| | - Wen-Hong Chen
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
- School of Geography and Environment, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
| | - Jia-Hao Zhai
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
- School of Geography and Environment, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
| | - Si-Qin Qi
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
- School of Geography and Environment, Jiangxi Normal University, Nanchang, 330022, People's Republic of China
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Yang Z, Zhang M, Yu Y, Shi X. Temperature triggers the annual cycle of Microcystis, comparable results from the laboratory and a large shallow lake. CHEMOSPHERE 2020; 260:127543. [PMID: 32659542 DOI: 10.1016/j.chemosphere.2020.127543] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 06/22/2020] [Accepted: 06/25/2020] [Indexed: 06/11/2023]
Abstract
Microcystis development in most temperate lakes shows an annual cycle that is mainly triggered by water temperature and includes four stages. This study aims to identify the optimum growth temperature and the temperature thresholds for recruitment and overwintering in Microcystis in Lake Taihu, based on field data and experiments at the cellular and genetic level on Microcystis under a simulated temperature condition. The field investigation showed that the cyanobacterial biomass began to increase at 11-15 °C in spring, reached a peak at 20-30 °C and remained at a low level after the water temperature declined below 6 °C. The simulation experiment found that the recovery of gene expression, photosynthesis and growth in Microcystis cells occurred at 11-14 °C and increased to an appreciable level after the temperature exceeded 20 °C. Microcystis cells stopped growing and maintained low photosynthetic activity and gene expression when the temperature declined to 10 °C or lower. These results suggest that Microcystis in Lake Taihu begin recruitment at 11-14 °C in spring and grow vigorously at 20-30 °C, then overwinter at 10 °C or lower in winter.
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Affiliation(s)
- Zhen Yang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, China
| | - Min Zhang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, China
| | - Yang Yu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, China
| | - Xiaoli Shi
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, China.
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Gao L, Li JD, Yang G, Zhang J, Xie Z. De-ammonification using direct contact membrane distillation – An experimental and simulation study. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117158] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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35
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Zhou X, He Y, Li H, Wei Y, Zhao L, Yang G, Chen X. Using flocculation and subsequent biomanipulation to control microcystis blooms: A laboratory study. HARMFUL ALGAE 2020; 99:101917. [PMID: 33218442 DOI: 10.1016/j.hal.2020.101917] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 03/27/2020] [Accepted: 10/07/2020] [Indexed: 06/11/2023]
Abstract
The frequent occurrence and long-term duration of Microcystis harmful algal blooms (HABs) are of great concern. Chemical flocculation is thought to be an effective way to deal with the HABs, while the application of the flocculants at a high dosage pose potential adverse impacts to the aquatic ecosystems. In this study, an alternative approach is proposed that involves the employment of polyaluminum chloride (PAC) combined with the Daphnia magna (D. magna) to achieve sustainable HABs removal efficiency with an acceptable ecological risk. It was found that under a dense Microcystis HABs (algal density of 1.5 × 107 cells/ml), a PAC dosage of 30 mg/l triggered >95% algae removal, but the released Al3+ caused 90% mortality of planktonic D. magna. Reducing the PAC dosage to 15 mg/l resulted in a slightly lower algal removal efficiency (>90%). In addition the reduced PAC dosage benefited the proliferation of the remaining unicellular algal cells, which tended to form a large colony during the 25-day experiment. Incubation of D. magna following flocculation with 15 mg/l PAC effectively grazed the remaining algal cells, meanwhile increasing the D. magna density by approximately 40-folds, and enlarging the body size by 1.37-1.50 times. This result implied that the released Al3+ was not detrimental to the D. magna. Flocculation with a reduced dosage is sufficient for colonial and large algal cells mitigation, which creates a window time for the biomanipulation of the residual tiny algae. Hence, the subsequent addition of D. magna triggered the sustainable removal of the HABs cells. The present study provides an environmentally friendly strategy for cleaning up the green tides without obvious detrimental effects on the aquatic ecosystem.
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Affiliation(s)
- Xin Zhou
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Yixin He
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Hong Li
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China.
| | - Yanyan Wei
- Cultivation Base of Guangxi Key Laboratory for Agro-Environment and Agro-Products Safety, College of Agriculture, Guangxi University, Nanning, 530004, China.
| | - Lei Zhao
- The second Construction Engineering Co., Ltd of the third Bureau of China Construction Co., Ltd., Wuhan, China
| | - Guofeng Yang
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Xudong Chen
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
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36
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Yang G, Tang X, Wilhelm SW, Pan W, Rui Z, Xu L, Zhong C, Hu X. Intermittent disturbance benefits colony size, biomass and dominance of Microcystis in Lake Taihu under field simulation condition. HARMFUL ALGAE 2020; 99:101909. [PMID: 33218435 DOI: 10.1016/j.hal.2020.101909] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 09/23/2020] [Accepted: 09/30/2020] [Indexed: 06/11/2023]
Abstract
Wind-driven wave disturbance is one of the environmental factors that shapes the formation of Microcystis blooms. Here we present data on the effect of different disturbance modes (continuous vs intermittent disturbances) on colony size, biomass and dominance of Microcystis in Lake Taihu under field conditions. Small submersible pumps were used to simulate different disturbance modes at turbulent dissipation rate (ε) of 2.98 × 10-6 m2 s-3. Our results show that the mean colony sizes of Microcystis in intermittent and continuous disturbance group were 1.94 and 1.23 times that of the control group, respectively. The mean densities of Microcystis in intermittent and continuous disturbance group were 4.23 and 2.91 times that of the control group, respectively. The mean proportion of Microcystis to total algae abundance in control group and continuous disturbance group changed from 78.3% at beginning of the experiment to 4.5% and 9.1% at the end of the experiment. However, the proportion of Microcystis to total algae cells in intermittent disturbance group was 65.7-94.3% during the whole experiment. The results demonstrated intermittent disturbances favored colony morphology, biomass and dominance of Microcystis. Our results suggested that intermittent disturbance benefited the formation of Microcystis bloom and was important in the development of predictive models for toxic cyanobacterial blooms under changing climates in shallow lakes.
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Affiliation(s)
- Guijun Yang
- School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Xiangming Tang
- Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Steven W Wilhelm
- Department of Microbiology, The University of Tennessee, Knoxville, TN 37996, United States
| | - Wenwen Pan
- School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Zheng Rui
- School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Lei Xu
- School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Chunni Zhong
- Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Xiquan Hu
- Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China.
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37
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Wu X, Yang T, Feng S, Li L, Xiao B, Song L, Sukenik A, Ostrovsky I. Recovery of Microcystis surface scum following a mixing event: Insights from a tank experiment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 728:138727. [PMID: 32361580 DOI: 10.1016/j.scitotenv.2020.138727] [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: 11/29/2019] [Revised: 04/13/2020] [Accepted: 04/14/2020] [Indexed: 06/11/2023]
Abstract
Cyanobacteria of the genus Microcystis produces surface scum that negatively affects water quality in inland waters. This scum layer can be disintegrated and vertically dispersed by external forces (e.g., wind mixing), followed by reformation of surface scum as buoyant Microcystis colonies migrate upward. However, the recovery dynamics of Microcystis surface scum following a strong mixing event have rarely been studied. Here, we used a tank experiment to investigate the process of Microcystis surface scum recovery after a mixing event with focus on dynamics of colonies of different size classes and their contribution to that process. Microcystis colony size distribution and colony volume concentration was measured using a laser in-situ scattering and transmissometry instrument. The dynamics of Microcystis in the water column and upward colony migration velocity were strongly dependent on colony size. Larger colonies (>180 μm) with fast upward migration rates contributed the most to surface scum formation shortly after turbulence subsided. The contribution of slowly migrating smaller colonies to scum formation was observed over notably longer time. The estimated floating velocities of large colonies ranged 0.15 to 0.46 m h-1 depending on colony size and were 5-15 times higher than those of smaller colonies (~0.03 m h-1). The changes in colony size distribution of Microcystis in the water column reflect the dynamics of surface scum. Analysis of size distribution of Microcystis colonies can be used for better understanding and prediction of Microcystis surface scum development in water bodies.
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Affiliation(s)
- Xingqiang Wu
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
| | - Tiantian Yang
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shanshan Feng
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lin Li
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Bangding Xiao
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Lirong Song
- Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Assaf Sukenik
- Kinneret Limnological Laboratory, Israel Oceanographic and Limnological Research, P.O.Box 447, Migdal 14950, Israel
| | - Ilia Ostrovsky
- Kinneret Limnological Laboratory, Israel Oceanographic and Limnological Research, P.O.Box 447, Migdal 14950, Israel.
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38
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Sampognaro L, Eirín K, Martínez de la Escalera G, Piccini C, Segura A, Kruk C. Experimental evidence on the effects of temperature and salinity in morphological traits of the Microcystis aeruginosa complex. J Microbiol Methods 2020; 175:105971. [DOI: 10.1016/j.mimet.2020.105971] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 06/01/2020] [Accepted: 06/01/2020] [Indexed: 11/17/2022]
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39
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Zhang H, Wang C, Zhang X, Zhang R, Ding L. Formation and inhibition of polycyclic aromatic hydrocarbons from the gasification of cyanobacterial biomass in supercritical water. CHEMOSPHERE 2020; 253:126777. [PMID: 32464755 DOI: 10.1016/j.chemosphere.2020.126777] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 04/09/2020] [Accepted: 04/10/2020] [Indexed: 06/11/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) formation and inhibition from supercritical water gasification (SCWG) of cyanobacterial biomass were investigated. High reaction temperature, long residence time, and low feedstock concentration favoured higher molecular weight (HMW) PAH formation. The total PAH yield reached 34.80 μg g-1 at 500 °C, 22.5 MPa, and 10 min. The main PAHs formed in the liquid phase and the solid residue were 3-ring and 4-ring PAHs, which were generated from the cycloaddition reaction of lower molecular weight (LMW) PAHs. In addition, 2-ring PAHs were produced from the Diels-Alder reaction of phenols and unsaturated hydrocarbons. The possible control methods for PAH formation during the SCWG of cyanobacterial biomass were proposed. H2O2 addition effectively inhibited the reaction pathways underlying PAH formation, and the addition at more than 1.0% concentration suppressed H2 production. The work revealed that the inhibition of PAHs was achieved in terms of improving the oxidisation condition during the SCWG process for converting wet biomass or organic wastes to energy sources.
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Affiliation(s)
- Huiwen Zhang
- College of Agricultural Science and Engineering, Hohai University, Nanjing, Jiangsu, 210098, China; School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China.
| | - Chenyu Wang
- College of Environment, Hohai University, Nanjing, Jiangsu, 210098, China
| | - Xiaoman Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China
| | - Runhao Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China
| | - Lei Ding
- School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China.
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40
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Chen H, Lürling M. Calcium promotes formation of large colonies of the cyanobacterium Microcystis by enhancing cell-adhesion. HARMFUL ALGAE 2020; 92:101768. [PMID: 32113593 DOI: 10.1016/j.hal.2020.101768] [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: 10/11/2019] [Revised: 01/21/2020] [Accepted: 01/28/2020] [Indexed: 06/10/2023]
Abstract
Large Microcystis colonies can lead to the rapid formation of surface accumulations, which are a globally significant environmental issue. Laboratory studies have shown that Ca2+ can quickly promote non-classical Microcystis colony formation via cell-adhesion, but our knowledge of the changes in the morphology of these colonies during subsequent long-term culture with Ca2+ is limited. In this study, a 72-day cultivation experiment was conducted to determine the long-term effects of Ca2+ on Microcystis colony formation. Laboratory results indicate that Ca2+ causes Microcystis to rapidly aggregate and form a colony through cell adhesion, then colony formation by cell-adhesion lost dominance, owing to the decrease in Ca2+ concentrations caused by precipitation/complexation. Although the initial colony morphology by cell adhesion is sparse, the newly divided cells, without separating from the mother cells, constantly fill the gaps in the original colony at Ca2+ concentrations >40 mg L-1 for a long time, which creates colonies on day 72 with a morphology similar to that of M. ichthyoblabe in Lake Taihu. If the Ca2+ levels in Lake Taihu continue to increase, Microcystis growth rate will decrease only slightly, while the colony proportion of total biovolume and biomass will increase. Moreover, higher Ca2+ concentrations do not affect microcystin content, but promote the content of bound extracellular polysaccharides (bEPS), enabling formation of larger colonies, which may promote Microcystis surface accumulation.
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Affiliation(s)
- Huaimin Chen
- College of Environment, Hohai University, No. 1 Xikang Road, Nanjing, 210098, PR China; Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA, Wageningen, the Netherlands.
| | - Miquel Lürling
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA, Wageningen, the Netherlands
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Wu X, Noss C, Liu L, Lorke A. Effects of small-scale turbulence at the air-water interface on microcystis surface scum formation. WATER RESEARCH 2019; 167:115091. [PMID: 31561089 DOI: 10.1016/j.watres.2019.115091] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 09/12/2019] [Accepted: 09/13/2019] [Indexed: 06/10/2023]
Abstract
Cyanobacterial surface scum (here defined as visible Cyanobacteria colonies accumulating at the lake surface) is a harmful phenomenon that negatively affects water quality, human and animal health. Colony-forming Microcystis is one of the most important and ubiquitous genera that can suddenly accumulate at water surfaces. Turbulent water motion, e.g., generated by wind, can vertically disperse this scum layer, which later can re-establish by upward migration of Microcystis colonies. However, the role of wind-generated turbulence in scum formation and development is still poorly understood. Here we present results from a laboratory mesocosm study where we analysed the processes of scum formation and its response to wind-generated turbulence at low wind speed (≤3.6 m s-1). Microcystis colony size and flow velocity at the water surface and in the bulk water were measured using a microscope camera and particle tracking velocimetry. The surface scum formed by aggregation of colonies at the water surface, where they formed loose clusters of increasing size. The presence of large colony aggregations or of a surface film determined the stability of the scum layer. For the largest applied wind speed, most of the aggregations were broken down to sizes <2 mm, which were dispersed to the bulk water. The surface scum recovered quickly from such disturbances after the wind speed decreased. We further observed reduced momentum transfer from wind to water with the growing scum layer. The presence of the scum increased the threshold wind speed for the onset of flow and reduced the flow velocities that were generated above that threshold. This effect was likely caused by the presence of a film of surface-active material at the water surface (surface microlayer), which is related to the presence of Microcystis. Both the small-scale turbulence and surface microlayer might play an important, yet largely unexplored role in Microcystis surface scum development in aquatic ecosystems. Improved understanding of the interplay of both processes will be instrumental for improving current mechanistic models for predicting surface bloom dynamics.
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Affiliation(s)
- Xingqiang Wu
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China; Institute for Environmental Sciences, University of Koblenz-Landau, Landau, 76829, Germany.
| | - Christian Noss
- Institute for Environmental Sciences, University of Koblenz-Landau, Landau, 76829, Germany
| | - Liu Liu
- Institute for Environmental Sciences, University of Koblenz-Landau, Landau, 76829, Germany; Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries, Stechlin, 16775, Germany
| | - Andreas Lorke
- Institute for Environmental Sciences, University of Koblenz-Landau, Landau, 76829, Germany
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42
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Wang Z, Zhang Y, Huang S, Peng C, Hao Z, Li D. Nitrogen limitation significantly reduces the competitive advantage of toxic Microcystis at high light conditions. CHEMOSPHERE 2019; 237:124508. [PMID: 31408798 DOI: 10.1016/j.chemosphere.2019.124508] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 07/31/2019] [Accepted: 08/02/2019] [Indexed: 06/10/2023]
Abstract
Microcystis is a notorious cyanobacterial genus due to its rapid growth rate, huge biomass, and producing toxins in some eutrophic freshwater environments. To reveal the regulatory factors of interspecific competition between toxic and non-toxic Microcystis, three dominant Microcystis strains were selected, and their photosynthesis, population dynamics and microcystins (MCYST) production were measured. The results suggested that nitrogen-limitation (N-limitation) had a greater restriction for the growth of toxic Microcystis than that of non-toxic Microcystis, especially when cultured at high light or high temperature based on the weight analysis of key factors. Comparison of photosynthesis showed that low light or N-rich would favor the competitive advantage of toxic Microcystis while high light combined with N-limitation would promote the competitive advantage of non-toxic Microcystis, and these two competitive advantages could be further amplified by temperature increase. Mixed competitive experiments of toxic and non-toxic Microcystis were conducted, and the results of absorption spectrum (A485/A665) and qPCR (real-time quantitative PCR) suggested that the proportion of toxic Microcystis and the half-time of succession process were significantly reduced by 69.4% and 28.4% (p < 0.01) respectively by combining N-limitation with high light intensity than that measured under N-limitation condition. N-limitation led to a significant decrease of MCYST cellular quota in Microcystis biomass, which would be further decreased to a lower level by the high light. Based on above mentioned analysis, to decrease the MCYST production of Microcystis blooms, we should control nutrient, especial nitrogen through pollutant intercepting and increase the light intensity through improving water transparency.
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Affiliation(s)
- Zhicong Wang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, PR China.
| | - Yun Zhang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
| | - Shun Huang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China.
| | - Chengrong Peng
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, PR China.
| | - Zhixiang Hao
- Tianjin Institute of Water Conservancy Science, Tianjin, 300061, PR China.
| | - Dunhai Li
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, PR China.
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43
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Duan Z, Tan X, Parajuli K, Zhang D, Wang Y. Characterization of Microcystis morphotypes: Implications for colony formation and intraspecific variation. HARMFUL ALGAE 2019; 90:101701. [PMID: 31806163 DOI: 10.1016/j.hal.2019.101701] [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: 05/28/2019] [Revised: 10/20/2019] [Accepted: 10/25/2019] [Indexed: 06/10/2023]
Abstract
Groundworks on Microcystis colony formation and morphological variation are critical to understanding the whole eco-cycle of Microcystis blooms. In this study, we tested the cell adhesion effect, an important pathway for colony formation, among Microcystis colonies of different morphotypes, and examined the potential linkage between cell properties and morphological plasticity. Results showed that cell adhesion significantly contributed to the aggregation of Microcystis colonies, but such adhesion only occurred in colonies belonging to the same morphotype. This suggests that Microcystis cannot form large colonies through a direct adhesion effect among different morphotypes, possibly due to substantial differences in the chemical structures and compositions of their extracellular polymeric substances (EPS). Cell functional features also varied substantially with morphotypes, implying high intraspecific variation in competitive and defensive strategies of Microcystis. Our results offer new insights into colony formation of Microcystis and substantiate the importance of fundamental chemical characteristics of EPS in determining the morphological plasticity.
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Affiliation(s)
- Zhipeng Duan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China; Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, 6708 PB Wageningen, Netherlands.
| | - Xiao Tan
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.
| | - Keshab Parajuli
- School of Population and Global Health, Faculty of Medicine, Denistry and Health Sciences, The University of Melbourne, VIC 3010, Australia
| | - Danfeng Zhang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
| | - Yi Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
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Zhu CM, Zhang JY, Guan R, Hale L, Chen N, Li M, Lu ZH, Ge QY, Yang YF, Zhou JZ, Chen T. Alternate succession of aggregate-forming cyanobacterial genera correlated with their attached bacteria by co-pathways. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 688:867-879. [PMID: 31255824 DOI: 10.1016/j.scitotenv.2019.06.150] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Accepted: 06/10/2019] [Indexed: 06/09/2023]
Abstract
Freshwater lakes are threatened by harmful blooms characterized by Cyanobacterial Aggregates (CAs) that are normally aggregated with extracellular polysaccharides released by cyanobacteria to form a phycosphere. It is possible that mutualistic relationships exist between bacteria and cyanobacteria in these CAs wherein bacterial products supplement cyanobacterial growth, and cyanobacterial exudates, in turn, serve as substrates for bacteria, thus augmenting the stability of each constituent. However, little is known about the exact interaction between cyanobacteria and their attached bacteria in CAs. Therefore, in this study, we collected 26 CA samples from Lake Taihu, a large freshwater lake in China from March of 2015 to February of 2016. We then sequenced both the V4 regions of 16S rRNA genes and full metagenomes, resulting in 610 Mb of 16S rRNA gene data and 198.98 Gb of high-quality metagenomic data. We observed that two cyanobacteria genera (Microcystis and Dolichospermum) alternately dominated CAs along the sampling time and specific bacterial genera attached to different cyanobacteria genera dominated CAs. More specifically, Dolichospermum dominates CAs when water temperature is low and total nitrogen is high, while Microcystis dominates CAs when water temperature is high and total nitrogen is low. Moreover, we found specific bacterial genera attached to different cyanobacteria genera dominated CAs. The cyanobacteria-bacteria related pairs Dolichospermum-Burkholderia and Microcystis-Hyphomonas were detected by ecological networks construction. Bacterial communities in CAs were found to be more correlated with the cyanobacterial community (Mantel's r = 0.76, P = 0.001) than with environmental factors (Mantel's r = 0.27, P = 0.017). A potential codependent nitrogen-cycling pathway between cyanobacteria and their attached bacteria was constructed, indicating their functional link. Overall, these results demonstrated that mutualistic relationships do, indeed, exist between cyanobacteria and bacteria in CAs at both taxonomic and gene levels, providing biological clues potentially leading to the control of blooms by interventional strategies to disrupt bacteria-cyanobacteria relationships and co-pathways.
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Affiliation(s)
- Cong-Min Zhu
- MOE Key Laboratory of Bioinformatics, Bioinformatics Division, Center for Synthetic & Systems Biology, Beijing National Research Center for Information Science and Technology, Department of Automation, Tsinghua University, Beijing 100084, China
| | - Jun-Yi Zhang
- State Key Lab for Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China; Wuxi Environmental Monitoring Centre, Wuxi, China
| | - Rui Guan
- State Key Lab for Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Lauren Hale
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, USA
| | - Ning Chen
- MOE Key Laboratory of Bioinformatics, Bioinformatics Division, Center for Synthetic & Systems Biology, Beijing National Research Center for Information Science and Technology, Department of Automation, Tsinghua University, Beijing 100084, China
| | - Ming Li
- College of Resources and Environment, Northwest A & F University, Yangling, People's Republic of China
| | - Zu-Hong Lu
- State Key Lab for Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Qin-Yu Ge
- State Key Lab for Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Yun-Feng Yang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China
| | - Ji-Zhong Zhou
- Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, USA; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China; School of Civil Engineering and Environmental Sciences, University of Oklahoma, Norman, OK, USA; Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Ting Chen
- Institute for Artificial Intelligence, Department of Computer Science and Technology, Tsinghua University, Beijing 100084, China; Tsinghua-Fuzhou Institute for Data Technology, Beijing National Research Center for Information Science and Technology, Tsinghua University, Beijing 100084, China.
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45
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Liu M, Ma J, Kang L, Wei Y, He Q, Hu X, Li H. Strong turbulence benefits toxic and colonial cyanobacteria in water: A potential way of climate change impact on the expansion of Harmful Algal Blooms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 670:613-622. [PMID: 30909039 DOI: 10.1016/j.scitotenv.2019.03.253] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 03/11/2019] [Accepted: 03/17/2019] [Indexed: 06/09/2023]
Abstract
Extreme natural events such as typhoons can amplify the effect of hydrodynamics on the lake ecosystems. Here we presented data on the effect of typhoons on algal cell size based on field observation. Then turbulence simulation systems were used to decipher the response of natural phytoplankton communities to a range of turbulence regimes (linked to typhoon-induced turbulence intensity) under laboratory conditions. Turbulence intensities of 6.17 × 10-3, 1.10 × 10-2 and 1.80 × 10-2 m2/s3 benefited algal growth and triggered abrupt switches from unicellular Chlorella dominated to colonial Microcystis dominance, and the abundance of colonial algae depended on the turbulence intensity. Under the influence of elevated turbulence, Microcystis dominated biomass increased by 2.60-6.58 times compared with that of Chlorella. At a given phytoplankton density and community composition, we observed a significant increase in extracellular microcystins (MCs) and a 47.5-fold increase in intracellular MCs with intensified turbulent mixing, suggesting that the damage of algal cells concomitantly the stimulation of toxin-producing Microcystis. Our results confirmed that the formation of large colonial algal cells, enhancement of the succession of algal species, and most importantly, the induction of toxin-producing Microcystis, were the active adaption strategy when phytoplankton were impacted by strong turbulence. The result implies that the ongoing climates changes and typhoon events are likely to contribute to undesirable outcomes concerning phytoplankton populations.
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Affiliation(s)
- Mengzi Liu
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Jianrong Ma
- CAS Key Laboratory of Reservoir Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Li Kang
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Yanyan Wei
- Cultivation Base of Guangxi Key Laboratory for Agro-Environment and Agro-Products Safety, College of Agriculture, Guangxi University, Nanning 530004, China
| | - Qiang He
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Xuebin Hu
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Hong Li
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China.
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46
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Xiao M, Li M, Duan P, Qu Z, Wu H. Insights into the relationship between colony formation and extracellular polymeric substances (EPS) composition of the cyanobacterium Microcystis spp. HARMFUL ALGAE 2019; 83:34-41. [PMID: 31097254 DOI: 10.1016/j.hal.2019.02.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 01/16/2019] [Accepted: 02/09/2019] [Indexed: 06/09/2023]
Abstract
Extracellular polymeric substances (EPS) were considered as fundamental substances in colony formation; however, the understanding of EPS composition remains limited. This study analyzed the content and composition of EPS fractions (soluble EPS, loosely bound EPS, and tightly bound EPS) of four Microcystis species from laboratory cultures in both unicellular and colonial morphologies, as well as colonies collected during Microcystis blooms, using fluorescence excitation - emission matrix spectroscopy combined with parallel factor analysis (EEM-PARAFAC). This method enables to make insight into protein-like and humic acid-like components but cannot detect polysaccharides. The EPS was successfully categorized into three humic acid-like components (C1 - C3) and a protein-like component (C4). Component C1 was discovered to be involved in colony formation and colony size growth of Microcystis. EPS content varied among Microcystis morphospecies, such as M. aeruginosa, M. wesenbergii and M. ichthyoblabe, and this was significantly affected by the environmental constraints rather than the morphospecies. The proportion of C1 relating to larger colony size was negatively correlated to temperature and concentrations of TN and TP. The tightly bound EPS directly promoted colony formation, but the soluble EPS or loosely bound EPS alone did not induce colony formation in Microcystis. These results advanced the current knowledge on the chemical materials involved in the colony formation of Microcystis and provided new clues in unicellular-multicellular transformation as well as colonial morphology changes in Microcystis.
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Affiliation(s)
- Man Xiao
- Australian Rivers Institute, Griffith University, 170 Kessels Road, Nathan, QLD 4111, Australia
| | - Ming Li
- Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Nanyang Normal University, Nanyang, 473061, PR China; College of Resources and Environment, Northwest A & F University, Yangling 712100, PR China.
| | - Pengfei Duan
- Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Nanyang Normal University, Nanyang, 473061, PR China
| | - Zhi Qu
- College of Resources and Environment, Northwest A & F University, Yangling 712100, PR China
| | - Haiming Wu
- College of Resources and Environment, Northwest A & F University, Yangling 712100, PR China
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47
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Shan K, Shang M, Zhou B, Li L, Wang X, Yang H, Song L. Application of Bayesian network including Microcystis morphospecies for microcystin risk assessment in three cyanobacterial bloom-plagued lakes, China. HARMFUL ALGAE 2019; 83:14-24. [PMID: 31097252 DOI: 10.1016/j.hal.2019.01.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 12/12/2018] [Accepted: 01/09/2019] [Indexed: 05/23/2023]
Abstract
Microcystis spp., which occur as colonies of different sizes under natural conditions, have expanded in temperate and tropical freshwater ecosystems and caused seriously environmental and ecological problems. In the current study, a Bayesian network (BN) framework was developed to access the probability of microcystins (MCs) risk in large shallow eutrophic lakes in China, namely, Taihu Lake, Chaohu Lake, and Dianchi Lake. By means of a knowledge-supported way, physicochemical factors, Microcystis morphospecies, and MCs were integrated into different network structures. The sensitive analysis illustrated that Microcystis aeruginosa biomass was overall the best predictor of MCs risk, and its high biomass relied on the combined condition that water temperature exceeded 24 °C and total phosphorus was above 0.2 mg/L. Simulated scenarios suggested that the probability of hazardous MCs (≥1.0 μg/L) was higher under interactive effect of temperature increase and nutrients (nitrogen and phosphorus) imbalance than that of warming alone. Likewise, data-driven model development using a naïve Bayes classifier and equal frequency discretization resulted in a substantial technical performance (CCI = 0.83, K = 0.60), but the performance significantly decreased when model excluded species-specific biomasses from input variables (CCI = 0.76, K = 0.40). The BN framework provided a useful screening tool to evaluate cyanotoxin in three studied lakes in China, and it can also be used in other lakes suffering from cyanobacterial blooms dominated by Microcystis.
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Affiliation(s)
- Kun Shan
- Big Data Mining and Applications Center, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; CAS Key Lab on Reservoir Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.
| | - Mingsheng Shang
- Big Data Mining and Applications Center, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; CAS Key Lab on Reservoir Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Botian Zhou
- Big Data Mining and Applications Center, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; CAS Key Lab on Reservoir Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
| | - Lin Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Xiaoxiao Wang
- CAS Key Lab on Reservoir Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hong Yang
- Department of Geography and Environmental Science, University of Reading, Whiteknights, Reading, RG6 6AB, UK
| | - Lirong Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Wang Z, Huang S, Li D. Decomposition of cyanobacterial bloom contributes to the formation and distribution of iron-bound phosphorus (Fe-P): Insight for cycling mechanism of internal phosphorus loading. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 652:696-708. [PMID: 30380477 DOI: 10.1016/j.scitotenv.2018.10.260] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 10/18/2018] [Accepted: 10/19/2018] [Indexed: 06/08/2023]
Abstract
Lake eutrophication and the resulting cyanobacterial blooms have become a global water environment problem. These eutrophic lakes usually have relatively high internal phosphorus loading such as Fe-P to support the formation of cyanobacterial blooms. In order to reveal the mechanisms and processes of phosphorus cycling in lake sediments, in this study, Lake Chaohu was selected as the research area, and the effects of cyanobacterial bloom decomposition on the horizontal distribution pattern of Fe-P was studied by field investigation and laboratory simulations. According to the phosphorus fractions in the sediments, Lake Chaohu can be divided into three lake areas, and the Fe-P content in western Chaohu is the highest (908.6 ± 54.9 mg kg-1). The contents and proportions of Fe-P were significantly positively correlated with cyanobacterial pigments in sediments, but they negatively correlated with undegraded chl-a, especially when the Fe-P content was <400 mg kg-1. Based on these statistical analyses, we proposed a hypothesis that the settled cyanobacterial organic matters (COM) could promote the formation of Fe-P. This hypothesis was proved by the simulation experiments of adding COM to the oligotrophic lakeshore clay. The results suggested that the content and proportion of Fe-P in sediments were significantly increased by the COM addition, and also, they were significantly positively correlated with the decomposition of the COM. The formation processes of Fe-P were further confirmed by the analysis of Fourier transform infrared (FT-IR) spectra. Microbial community analysis suggested that the bacterial species including FeOB and genus Pseudomonas might play an important role in the formation of Fe-P. This study suggested that the settled COM could enhance the eutrophication of sediments through a positive feedback cycle. Therefore, it is necessary to carry out bloom removal and sediment dredging simultaneously, and only then the cyanobacterial bloom can be effectively controlled.
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Affiliation(s)
- Zhicong Wang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China.
| | - Shun Huang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
| | - Dunhai Li
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China.
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49
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Wei ZHU, Huaimin CHEN, Ruochen WANG, Ganyu FENG, Zongpu XUE, Siyuan HU. Analysis on the reasons for the large bloom area of Lake Taihu in 2017. ACTA ACUST UNITED AC 2019. [DOI: 10.18307/2019.0302] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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50
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Wang M, Shi W, Chen Q, Zhang J, Yi Q, Hu L. Effects of nutrient temporal variations on toxic genotype and microcystin concentration in two eutrophic lakes. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 166:192-199. [PMID: 30269014 DOI: 10.1016/j.ecoenv.2018.09.095] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 09/19/2018] [Accepted: 09/21/2018] [Indexed: 06/08/2023]
Abstract
Harmful cyanobacterial blooms are a growing threat to freshwater ecosystems worldwide due to the production of microcystin (MC), which can have detrimental effects on water quality and human health. The relations between MC-producing Microcystis, MC production, and environmental variables especially nutrient conditions in eutrophic lakes, Lake Taihu and Lake Yanghe, were investigated during the bloom season of 2015. Results showed that toxigenic cells contributed to 8.94-75.68% and 7.87-58.69% of the total Microcystis in Lake Taihu and Lake Yanghe, respectively. The dynamics of toxigenic cells and MC production were positively associated with NH3-N concentration in Lake Taihu, while positively associated with the concentrations of TP, TDP and PO4-P in Lake Yanghe, indicating that the dominant nutrient factor affecting the toxic blooms was nitrogen in Lake Taihu, whereas it was phosphorus in Lake Yanghe. The significant relationship between TLR eq (total MC after transformation of MC-RR and MC-YR into MC-LR) and Chlorophyll-a (Chl-a) concentration implied that Chl-a could be an alternative measure to predict MC risk in the two lakes, and the safe threshold value of Chl-a was proposed as 25.38 and 31.06 μg/L in Lake Taihu and Lake Yanghe, respectively.
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Affiliation(s)
- Min Wang
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China; Center for Eco-Environmental Research, Nanjing Hydraulic Research Institute, Nanjing 210029, China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Wenqing Shi
- Center for Eco-Environmental Research, Nanjing Hydraulic Research Institute, Nanjing 210029, China
| | - Qiuwen Chen
- Center for Eco-Environmental Research, Nanjing Hydraulic Research Institute, Nanjing 210029, China.
| | - Jianyun Zhang
- Center for Eco-Environmental Research, Nanjing Hydraulic Research Institute, Nanjing 210029, China
| | - Qitao Yi
- Center for Eco-Environmental Research, Nanjing Hydraulic Research Institute, Nanjing 210029, China
| | - Liuming Hu
- Center for Eco-Environmental Research, Nanjing Hydraulic Research Institute, Nanjing 210029, China
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