Mechanism study on the frequent variations of cell-bound microcystins in cyanobacterial blooms in Lake Taihu: Implications for water quality monitoring and assessments |
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| Institution: | 1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, PR China;2. Graduate School of Chinese Academy of Sciences, Beijing 100049, PR China;1. A. N. Severtzov Institute of Ecology and Evolution of RAS, Moscow, Russia;2. Biological Department, Altai State University, Barnaul, Russia;1. Universidade Estadual do Piauí (UESPI), Campus Heróis do Jenipapo, Laboratório de Biodiversidade, Brazil;2. Instituto de Biodiversidad Neotropical, CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Universidad Nacional de Tucumán, Facultad de Ciencias Naturales e Instituto Miguel Lillo, Tucumán, Argentina;3. Centro de Biociências, Laboratório de Estudos de Briozoários, Universidade Federal de Pernambuco, Brazil;4. Centro de Biociências, Laboratório de Porifera, Universidade Federal de Pernambuco, Brazil;5. Museu de Entomologia, Departamento de Entomologia, Universidade Federal do Viçosa, Brazil;1. Department of Biology and Program in Earth and Environmental Science, University of Texas at Arlington, Arlington, TX 76019, USA;2. Department of Wildlife and Fisheries Sciences, Texas A&M University, College Station, TX 77843, USA;3. Department of Environmental Science, Center for Reservoir and Aquatic Systems Research, Baylor University, One Bear Place #97266, Waco, TX 76798, USA;1. Instituto de Biodiversidad Neotropical, CONICET, Universidad Nacional de Tucumán, Facultad de Ciencias Naturales, Ciudad Universitaria, Horco Molle, 4107, Tucumán, Argentina;2. Universidade Federal de Roraima (UFRR), Campus Paricarana, Centro de Estudos da Biodiversidade (CBio), CEP 69310-000, Boa Vista, Roraima, Brazil;3. Coordenação de pesquisa em Biodiversidade (CBio), Instituto Nacional de Pesquisas da Amazônia (INPA), CEP 69060-001, Manaus, Amazonas, Brazil;4. Museu de Entomologia, Depto. de Entomologia, Universidade Federal de Viçosa, CEP 36.570-900, Viçosa, MG, Brazil;1. Oertijdmuseum, Bosscheweg 80, 5283 WB, Boxtel, the Netherlands;2. Natuurhistorisch Museum Maastricht, De Bosquetplein 6-7, 6211 KJ, Maastricht, the Netherlands;3. Department of Geosciences, Edinboro University of Pennsylvania, Edinboro, PA, 16444, USA |
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| Abstract: | Although Microcystis-based toxins have been intensively studied, previous studies using laboratory cultures of Microcystis strains are difficult to explain the phenomenon that microcystin concentrations and toxin variants in natural blooms differ widely and frequently within a short-term period. The present study was designed to unravel the mechanisms for the frequent variations of intracellular toxins related to the differences in cyanobacterial colonies during bloom seasons in Lake Taihu, China. Monitoring of Microcystis colonies during warm seasons indicated that the variations in microcystins in both concentrations and toxin species were associated with the frequent alteration of Microcystis colonies in Lake Taihu. High concentration of microcystins in the blooms was always associated with two Microcystis colonies, Microcystis flos-aquae and Microcystis aeruginosa, whereas when Microcystis wesenbergii was the dominant colonial type, the toxin production of the blooms was low. Additionally, environmental factors such as temperature and nutrition were also shown to have an effect on the toxin production of the blooms, and may also potentially influence the Microcystis species present. The results of the present study provides insight into a new consideration for quick water quality monitoring, assessment and risk alert in cyanobacterium- and toxin-contaminated freshwaters, which will be beneficial not only for water agencies but also for public health. |
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