Analyzing the importance of top-down and bottom-up controls in food webs of Chinese lakes through structural equation modeling

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• 作者：Xue Du ; Emili García-Berthou ; Qidong Wang ; Jiashou Liu ; Tanglin Zhang…
• 关键词：Top ; down controls ; Bottom ; up effects ; Zooplankton ; Structural equation modeling
• 刊名：Aquatic Ecology
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：49
• 期：2
• 页码：199-210
• 全文大小：806 KB
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• 作者单位：Xue Du (1) (2)
  Emili García-Berthou (3)
  Qidong Wang (1)
  Jiashou Liu (1)
  Tanglin Zhang (1)
  Zhongjie Li (1)
  
  1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China
  2. Heilongjiang River Fishery Research Institute, Chinese Academy of Fishery Sciences, Harbin, 150070, China
  3. Institute of Aquatic Ecology, University of Girona, 17071, Girona, Catalonia, Spain
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Hydrobiology
  
• 出版者：Springer Netherlands
• ISSN：1573-5125

文摘

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.