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题名: Analyzing the importance of top-down and bottom-up controls in food webs of Chinese lakes through structural equation modeling
作者: Du, Xue1, 2; Garcia-Berthou, Emili3; Wang, Qidong1; Liu, Jiashou1; Zhang, Tanglin1; Li, Zhongjie1
通讯作者: Li, ZJ (reprint author), Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China.
关键词: Top-down controls ; Bottom-up effects ; Zooplankton ; Structural equation modeling
刊名: AQUATIC ECOLOGY
发表日期: 2015-06-01
DOI: 10.1007/s10452-015-9518-3
卷: 49, 期:2, 页:199-210
收录类别: SCI
文章类型: Article
部门归属: [Du, Xue ; Wang, Qidong ; Liu, Jiashou ; Zhang, Tanglin ; Li, Zhongjie] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China ; [Du, Xue] Chinese Acad Fishery Sci, Heilongjiang River Fishery Res Inst, Harbin 150070, Peoples R China ; [Garcia-Berthou, Emili] Univ Girona, Inst Aquat Ecol, Girona 17071, Catalonia, Spain
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Ecology ; Limnology ; Marine & Freshwater Biology
研究领域[WOS]: Environmental Sciences & Ecology ; Marine & Freshwater Biology
英文摘要: Zooplankton is generally affected by both top-down and bottom-up regulations in aquatic ecosystems. However, the relative strength of top-down and bottom-up controls on zooplankton assemblages is not well understood. Here, we analyzed this question in five lakes of the Yangtze River basin, an area with high population density and thousands of lakes, many of them suffering multiple environmental pressures. We sampled the whole communities of five lakes in the middle reaches of Yangtze River basin from 2006 to 2011 and used structural equation modeling to evaluate the relative importance of joint top-down and bottom-up effects. With increasing total phosphorous (TP), a major shift occurred in trophic structure. Biomass of phytoplankton, rotifers, cyclopoids, and planktivorous fish significantly increased, while cladocerans and calanoids were negatively correlated with increasing TP. The bottom-up effects were strongest at the bottom of the food web (e.g., effects of TP on phytoplankton). Direct bottom-up effects of phytoplankton and other food resources (latent variable) on rotifers and cyclopoids were greater than top-down controls from planktivores. The predation pressure on crustacean zooplankton by planktivores was higher than that on rotifers. In planktivore-dominated systems, piscivores only played a marginal role, whereas they seem affected by water quality. These results suggest not only in the food web processes the important role of nutrient pollution in affecting the top of the food web in these lakes, but also that the impacts and relative strength of bottom-up and top-down controls may vary with zooplankton assemblages, indicating the complexity of food webs in degraded lakes in China.
关键词[WOS]: NEW-ZEALAND LAKES ; FRESH-WATER ; SUBMERGED MACROPHYTES ; ZOOPLANKTON COMMUNITIES ; PLANKTIVOROUS FISH ; TROPHIC STRUCTURE ; TEMPERATE LAKES ; SPECIES DENSITY ; BODY-SIZE ; SHALLOW
语种: 英语
WOS记录号: WOS:000354612800006
ISSN号: 1386-2588
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/23855
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, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2.Chinese Acad Fishery Sci, Heilongjiang River Fishery Res Inst, Harbin 150070, Peoples R China
3.Univ Girona, Inst Aquat Ecol, Girona 17071, Catalonia, Spain
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