caa a22 4500 605509425 CHVBK 20210128100641.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10452-015-9518-3 doi (NATIONALLICENCE)springer-10.1007/s10452-015-9518-3 Analyzing the importance of top-down and bottom-up controls in food webs of Chinese lakes through structural equation modeling [Elektronische Daten] [Xue Du, Emili García-Berthou, Qidong Wang, Jiashou Liu, Tanglin Zhang, Zhongjie Li] 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. Springer Science+Business Media Dordrecht, 2015 Top-down controls nationallicence Bottom-up effects nationallicence Zooplankton nationallicence Structural equation modeling nationallicence Du Xue State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut García-Berthou Emili Institute of Aquatic Ecology, University of Girona, 17071, Girona, Catalonia, Spain aut Wang Qidong State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut Liu Jiashou State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut Zhang Tanglin State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut Li Zhongjie State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut Aquatic Ecology Springer Netherlands 49/2(2015-06-01), 199-210 1386-2588 49:2<199 2015 49 10452 https://doi.org/10.1007/s10452-015-9518-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10452-015-9518-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Du Xue State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut NATIONALLICENCE 700 1- García-Berthou Emili Institute of Aquatic Ecology, University of Girona, 17071, Girona, Catalonia, Spain aut NATIONALLICENCE 700 1- Wang Qidong State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut NATIONALLICENCE 700 1- Liu Jiashou State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut NATIONALLICENCE 700 1- Zhang Tanglin State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut NATIONALLICENCE 700 1- Li Zhongjie State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072, Wuhan, China aut NATIONALLICENCE 773 0- Aquatic Ecology Springer Netherlands 49/2(2015-06-01), 199-210 1386-2588 49:2<199 2015 49 10452