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Reduction in microcystin concentrations in large and shallow lakes: Water and sediment-interface contributions
Chen, Wei1; Song, Lirong1; Peng, Liang1,2; Wan, Neng1,2; Zhang, Xiaoming1; Gan, Nanqin1; Song, LR, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2008-02-01
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume42Issue:3Pages:763-773
AbstractBlooms of cyanobacteria, or blue-greens, are known to produce chemicals, such as microcystins, which can be toxic to aquatic and terrestrial organisms. Although previous studies have examined the fate of microcystins in freshwater lakes, primary elimination pathways and factors affecting degradation and loss have not been fully explained. The goal of the present study was to explore sources of algal toxins and investigate the distribution and biodegradation of microcystins in water and sediment through laboratory and field analyses. Water and sediment samples were collected monthly from several locations in Lake Taihu from February 2005 to January 2006. Samples were analyzed for the presence of microcystin. Water and sediment were also used in laboratory studies to determine microcystin degradation rates by spiking environmental samples with known concentrations of the chemical and observing concentration changes over time. Some water samples were found to efficiently degrade microcystins. Microcystin concentrations dropped faster in water collected immediately above lake sediment (overlying water). Degradation in sediments was higher than in water. Based on spatial distribution analyses of microcystin in Lake Taihu, higher concentrations (relative to water concentrations) of the chemical were found in lake sediments. These data suggest that sediments play a critical role in microcystin degradation in aquatic systems. The relatively low levels of microcystins found in the environment are most likely due to bacterial biodegradation. Sediments play a crucial role as a source (to the water column) of bio-degrading bacteria and as a carbon-rich environment for bacteria to proliferate and metabolize microcystin and other biogenic toxins produced by cyanobacteria. These, and other, data provide important information that may be applied to management strategies for improvement of water quality in lakes, reservoirs and other water bodies. (C) 2007 Elsevier Ltd. All rights reserved.; Blooms of cyanobacteria, or blue-greens, are known to produce chemicals, such as microcystins, which can be toxic to aquatic and terrestrial organisms. Although previous studies have examined the fate of microcystins in freshwater lakes, primary elimination pathways and factors affecting degradation and loss have not been fully explained. The goal of the present study was to explore sources of algal toxins and investigate the distribution and biodegradation of microcystins in water and sediment through laboratory and field analyses. Water and sediment samples were collected monthly from several locations in Lake Taihu from February 2005 to January 2006. Samples were analyzed for the presence of microcystin. Water and sediment were also used in laboratory studies to determine microcystin degradation rates by spiking environmental samples with known concentrations of the chemical and observing concentration changes over time. Some water samples were found to efficiently degrade microcystins. Microcystin concentrations dropped faster in water collected immediately above lake sediment (overlying water). Degradation in sediments was higher than in water. Based on spatial distribution analyses of microcystin in Lake Taihu, higher concentrations (relative to water concentrations) of the chemical were found in lake sediments. These data suggest that sediments play a critical role in microcystin degradation in aquatic systems. The relatively low levels of microcystins found in the environment are most likely due to bacterial biodegradation. Sediments play a crucial role as a source (to the water column) of bio-degrading bacteria and as a carbon-rich environment for bacteria to proliferate and metabolize microcystin and other biogenic toxins produced by cyanobacteria. These, and other, data provide important information that may be applied to management strategies for improvement of water quality in lakes, reservoirs and other water bodies. (C) 2007 Elsevier Ltd. All rights reserved.
SubtypeArticle
KeywordMicrocystin Environmental Fate Sediment Biodegradation Eutrophication Cyanobacteria Blue-green Algae
Department[Chen, Wei; Song, Lirong; Peng, Liang; Wan, Neng; Zhang, Xiaoming; Gan, Nanqin] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China; [Peng, Liang; Wan, Neng] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
Subject AreaEngineering, Environmental ; Environmental Sciences ; Water Resources
DOI10.1016/j.watres.2007.08.007
WOS HeadingsScience & Technology ; Technology ; Life Sciences & Biomedicine ; Physical Sciences
Indexed BySCI
Language英语
WOS Research AreaEngineering ; Environmental Sciences & Ecology ; Water Resources
WOS SubjectEngineering, Environmental ; Environmental Sciences ; Water Resources
WOS IDWOS:000253512200026
WOS KeywordCYANOBACTERIAL HEPATOTOXINS ; MEILIANG BAY ; DEGRADATION ; LR ; CYANOTOXINS ; PERSISTENCE ; EXTRACTION ; ADSORPTION ; EXPOSURE ; SORPTION
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Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8246
Collection期刊论文
Corresponding AuthorSong, LR, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
Affiliation1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Chen, Wei,Song, Lirong,Peng, Liang,et al. Reduction in microcystin concentrations in large and shallow lakes: Water and sediment-interface contributions[J]. WATER RESEARCH,2008,42(3):763-773.
APA Chen, Wei.,Song, Lirong.,Peng, Liang.,Wan, Neng.,Zhang, Xiaoming.,...&Song, LR, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China.(2008).Reduction in microcystin concentrations in large and shallow lakes: Water and sediment-interface contributions.WATER RESEARCH,42(3),763-773.
MLA Chen, Wei,et al."Reduction in microcystin concentrations in large and shallow lakes: Water and sediment-interface contributions".WATER RESEARCH 42.3(2008):763-773.
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