Reduction in microcystin concentrations in large and shallow lakes: Water and sediment-interface contributions
文献类型：期刊论文
| 作者 | Chen, Wei1; Song, Lirong1; Peng, Liang1,2; Wan, Neng1,2; Zhang, Xiaoming1; Gan, Nanqin1 |
| 刊名 | WATER RESEARCH
 |
| 出版日期 | 2008-02-01 |
| 卷号 | 42期号:3页码:763-773 |
| 关键词 | microcystin environmental fate sediment biodegradation eutrophication cyanobacteria blue-green algae |
| ISSN号 | 0043-1354 |
| 通讯作者 | Song, LR, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China |
| 中文摘要 | 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. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Technology ; Life Sciences & Biomedicine ; Physical Sciences |
| 学科主题 | Engineering, Environmental; Environmental Sciences; Water Resources |
| 类目[WOS] | Engineering, Environmental ; Environmental Sciences ; Water Resources |
| 研究领域[WOS] | Engineering ; Environmental Sciences & Ecology ; Water Resources |
| 关键词[WOS] | CYANOBACTERIAL HEPATOTOXINS ; MEILIANG BAY ; DEGRADATION ; LR ; CYANOTOXINS ; PERSISTENCE ; EXTRACTION ; ADSORPTION ; EXPOSURE ; SORPTION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000253512200026 |
| 公开日期 | 2010-10-13 |
| 源URL | [http://ir.ihb.ac.cn/handle/152342/8246]  |
| 专题 | 水生生物研究所_中科院水生所知识产出（2009年前）_期刊论文 |
| 作者单位 | 1.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 |
| 推荐引用方式 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,&Gan, Nanqin.(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. |
入库方式： OAI收割
来源：水生生物研究所
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