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Environmental factors associated with cyanobacterial assemblages in a mesotrophic subtropical plateau lake: A focus on bloom toxicity.
Sci Total Environ. 2021 Jul 10; 777:146052.ST

Abstract

Harmful algal blooms caused by cyanobacteria have been increasing in frequency worldwide. However, the main environmental drivers of this change are often difficult to identify because of the effects of the interaction between eutrophication and climate change. Recently, filamentous N2-fixing cyanobacteria and non-diazotrophic Microcystis have been observed to be co-existing and undergoing succession in some eutrophic lakes. However, the succession patterns of dominant cyanobacteria and the factors driving this in mesotrophic lakes are not well understood. We hypothesized that the changes in cyanobacterial assemblages in mesotrophic lakes could result in a relatively high risks of toxic blooms, and that these changes are associated with the global climatic changes. We tested these hypotheses using data from the subtropical mesotrophic Lake Erhai. We found that the high spatiotemporal variability in the cyanobacterial community, and the increase in biomass were driven primarily by the growth of bloom-forming cyanobacterial taxa. Species-specific biomasses were related to a different environmental stressor; increases in dissolved organic carbon (DOC) concentrations were statistically associated with an increase of Microcystis biomass, whereas increases in surface water temperature favored higher biomass of Pseudanabaena at low transparency and high concentration of phosphorus. In addition, low nitrogen- to- phosphorus ratios were identified as potential determinants of the abundance of N2-fixing Dolichospermum. Furthermore, changes in the concentration of DOC, total nitrogen, pH and water transparency levels were found to affect the composition of Microcystis morphotypes and genotypes mostly. This study highlights that the toxic to non-toxic Microcystis ratio might increase with the water darkening and browning (which occurs in many subtropical plateau lakes). Lake management strategies, therefore, need to consider the toxicity of cyanobacterial assemblages in mesotrophic lakes over the intensity of the cyanobacterial blooms.

Authors+Show Affiliations

Hunan Engineering Research Center of Aquatic Organism Resources and Environmental Ecology, College of Life and Environmental Sciences, Hunan University of Arts and Science, Changde 415000, China; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.Chongqing Key Laboratory of Big Data and Intelligent Computing, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China. Electronic address: shankun@cigit.ac.cn.Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Yunnan Research Academy of Eco-environmental Sciences, Kunming 650034, China.Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China.School of Information Science and Technology, Yunnan Normal University, Kunming 650500, China.Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Yunnan Research Academy of Eco-environmental Sciences, Kunming 650034, China; Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China. Electronic address: qchzhou@ynu.edu.cn.State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33677307

Citation

Hu, Lili, et al. "Environmental Factors Associated With Cyanobacterial Assemblages in a Mesotrophic Subtropical Plateau Lake: a Focus On Bloom Toxicity." The Science of the Total Environment, vol. 777, 2021, p. 146052.
Hu L, Shan K, Huang L, et al. Environmental factors associated with cyanobacterial assemblages in a mesotrophic subtropical plateau lake: A focus on bloom toxicity. Sci Total Environ. 2021;777:146052.
Hu, L., Shan, K., Huang, L., Li, Y., Zhao, L., Zhou, Q., & Song, L. (2021). Environmental factors associated with cyanobacterial assemblages in a mesotrophic subtropical plateau lake: A focus on bloom toxicity. The Science of the Total Environment, 777, 146052. https://doi.org/10.1016/j.scitotenv.2021.146052
Hu L, et al. Environmental Factors Associated With Cyanobacterial Assemblages in a Mesotrophic Subtropical Plateau Lake: a Focus On Bloom Toxicity. Sci Total Environ. 2021 Jul 10;777:146052. PubMed PMID: 33677307.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Environmental factors associated with cyanobacterial assemblages in a mesotrophic subtropical plateau lake: A focus on bloom toxicity. AU - Hu,Lili, AU - Shan,Kun, AU - Huang,Licheng, AU - Li,Yuanrui, AU - Zhao,Lei, AU - Zhou,Qichao, AU - Song,Lirong, Y1 - 2021/02/24/ PY - 2020/11/26/received PY - 2021/02/19/revised PY - 2021/02/19/accepted PY - 2021/3/8/pubmed PY - 2021/5/29/medline PY - 2021/3/7/entrez KW - Dolichospermum KW - Erhai Lake KW - Microcystin KW - Microcystis KW - Pseudanabaena SP - 146052 EP - 146052 JF - The Science of the total environment JO - Sci Total Environ VL - 777 N2 - Harmful algal blooms caused by cyanobacteria have been increasing in frequency worldwide. However, the main environmental drivers of this change are often difficult to identify because of the effects of the interaction between eutrophication and climate change. Recently, filamentous N2-fixing cyanobacteria and non-diazotrophic Microcystis have been observed to be co-existing and undergoing succession in some eutrophic lakes. However, the succession patterns of dominant cyanobacteria and the factors driving this in mesotrophic lakes are not well understood. We hypothesized that the changes in cyanobacterial assemblages in mesotrophic lakes could result in a relatively high risks of toxic blooms, and that these changes are associated with the global climatic changes. We tested these hypotheses using data from the subtropical mesotrophic Lake Erhai. We found that the high spatiotemporal variability in the cyanobacterial community, and the increase in biomass were driven primarily by the growth of bloom-forming cyanobacterial taxa. Species-specific biomasses were related to a different environmental stressor; increases in dissolved organic carbon (DOC) concentrations were statistically associated with an increase of Microcystis biomass, whereas increases in surface water temperature favored higher biomass of Pseudanabaena at low transparency and high concentration of phosphorus. In addition, low nitrogen- to- phosphorus ratios were identified as potential determinants of the abundance of N2-fixing Dolichospermum. Furthermore, changes in the concentration of DOC, total nitrogen, pH and water transparency levels were found to affect the composition of Microcystis morphotypes and genotypes mostly. This study highlights that the toxic to non-toxic Microcystis ratio might increase with the water darkening and browning (which occurs in many subtropical plateau lakes). Lake management strategies, therefore, need to consider the toxicity of cyanobacterial assemblages in mesotrophic lakes over the intensity of the cyanobacterial blooms. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/33677307/Environmental_factors_associated_with_cyanobacterial_assemblages_in_a_mesotrophic_subtropical_plateau_lake:_A_focus_on_bloom_toxicity_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(21)01119-0 DB - PRIME DP - Unbound Medicine ER -