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学科主题: Environmental Sciences; Limnology; Marine & Freshwater Biology
题名: Impacts of cascade run-of-river dams on benthic diatoms in the Xiangxi River, China
作者: Wu, N.1, 2; Tang, T.1; Fu, X.1; Jiang, W.1; Li, F.1; Zhou, S.1; Cai, Q.1; Fohrer, N.2
通讯作者: Cai, Q, Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
关键词: Benthic diatoms ; Cascade run-of-river dams ; PLS models ; Xiangxi River
刊名: AQUATIC SCIENCES
发表日期: 2010
DOI: 10.1007/s00027-009-0121-3
卷: 72, 期:1, 页:117-125
收录类别: SCI
文章类型: Article
部门归属: [Wu, N.; Tang, T.; Fu, X.; Jiang, W.; Li, F.; Zhou, S.; Cai, Q.] Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China; [Wu, N.; Fohrer, N.] Univ Kiel, Dept Hydrol & Water Resource Management, Ctr Ecol, D-24118 Kiel, Germany
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: National Natural Science Foundation of China [30330140, 40671197]; CAS [KZCX2-YW427]
类目[WOS]: Environmental Sciences ; Limnology ; Marine & Freshwater Biology
研究领域[WOS]: Environmental Sciences & Ecology ; Marine & Freshwater Biology
摘要: The ecological effects of small run-of-river dams on aquatic ecosystems are poorly understood, especially on downstream benthic algal communities. We examined impacts of such dams on the benthic diatom community at a regional scale in the Xiangxi River, China. A total of 90 sites were visited, which were divided into five habitats (H1-H5) according to impact extent of each dam. Using partial least squares (PLS) modeling, we developed two predictive models (diatom species richness and total diatom density) based on environmental variables of an unregulated habitat (H1). These models were then used to predict species richness and total densities at impacted habitats (H2-H5) and residuals, i.e. the differences between observed and predicted values, were used to evaluate impact strength of flow regulation. Significant impacts of flow regulation on diatom species richness were detected at three impacted habitats (H3-H5), where observed species richness were significantly higher-70.6, 63.9 and 46.6%, respectively-than predicted values. Then, possible mechanisms for observed impacts were discussed. Further research is necessary to address the potential negative impacts of cascade run-of-river dams on other aquatic organisms in different seasons, and to explore more appropriate mechanisms for such impacts, which may lead to sustainable management strategies and help to determine the optimal ecological water requirement for the Xiangxi River.
英文摘要: The ecological effects of small run-of-river dams on aquatic ecosystems are poorly understood, especially on downstream benthic algal communities. We examined impacts of such dams on the benthic diatom community at a regional scale in the Xiangxi River, China. A total of 90 sites were visited, which were divided into five habitats (H1-H5) according to impact extent of each dam. Using partial least squares (PLS) modeling, we developed two predictive models (diatom species richness and total diatom density) based on environmental variables of an unregulated habitat (H1). These models were then used to predict species richness and total densities at impacted habitats (H2-H5) and residuals, i.e. the differences between observed and predicted values, were used to evaluate impact strength of flow regulation. Significant impacts of flow regulation on diatom species richness were detected at three impacted habitats (H3-H5), where observed species richness were significantly higher-70.6, 63.9 and 46.6%, respectively-than predicted values. Then, possible mechanisms for observed impacts were discussed. Further research is necessary to address the potential negative impacts of cascade run-of-river dams on other aquatic organisms in different seasons, and to explore more appropriate mechanisms for such impacts, which may lead to sustainable management strategies and help to determine the optimal ecological water requirement for the Xiangxi River.
关键词[WOS]: SMALL HYDROPOWER ; STREAM ; REMOVAL ; ALGAE ; PHYTOPLANKTON ; COMMUNITIES ; ASSEMBLAGES ; BIOMASS ; LARVAE ; PLS
语种: 英语
WOS记录号: WOS:000272901900010
ISSN号: 1015-1621
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/13562
Appears in Collections:淡水生态学研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
2.Univ Kiel, Dept Hydrol & Water Resource Management, Ctr Ecol, D-24118 Kiel, Germany

Recommended Citation:
Wu, N.; Tang, T.; Fu, X.; Jiang, W.; Li, F.; Zhou, S.; Cai, Q.; Fohrer, N..Impacts of cascade run-of-river dams on benthic diatoms in the Xiangxi River, China,AQUATIC SCIENCES,2010,72(1):117-125
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