Potential influence of water level changes on energy flows in a lake food web

作     者：WANG YuYu YU XiuBo LI WenHua XU Jun CHEN YuWei FAN Na 

作者机构：Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Donghu Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and Biotechnology of China Institute of Hydro- biology Chinese Academy of Sciences Wuhan 430072 China Institute of Ecology Lund University Ecology Building SE-223 62 Lund Sweden Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China 

出 版 物：《Chinese Science Bulletin》 (Chinese Science Bulletin)

年 卷 期：2011年第56卷第26期

页      面：2794-2802页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：supported by the National Basic Research Program of China (2009CB421106) the National Natural Science Foundation of China (30870428) the K.C.Wong Education Foundation and the Knowledge Innovation Program of the Chinese Academy of Sciences 

主　　题：水位变化 食物网 无脊椎动物 食物来源 同位素特征 流量 能量 水生动物 

摘      要：Large seasonal water-level fluctuations may influence isotopic signatures of primary producers and the types and amounts of these potential food sources accessible to aquatic fauna of Poyang Lake,the largest freshwater lake in *** this study,the isotopic signatures of primary producers and consumers were determined,stable carbon and nitrogen isotope analysis and mixing models were combined to investigate the influence of water levels on the diet and isotopic composition of Poyang Lake fish and *** potential food sources (seston,benthic organic matter,aquatic macrophytes,attached algae,and terrestrial plants),4 species of invertebrates,and 10 species of fish were collected from the lake area during dry and wet seasons between January 2009 and April *** δ 13C values of invertebrates and most fish were within the range of δ 13C values of the potential food sources for both *** δ 13C values of invertebrates and most fish were lower in the dry season than in the wet season,whereas the δ 15N values exhibited different patterns for different *** models indicated that the most important food sources for common lake fauna were seston in the dry season and aquatic macrophytes and terrestrial plants in the wet *** fauna were more omnivorous in the wet season than in the dry *** food web dynamics of Poyang Lake are strongly influenced by changes in the abundance and accessibility of different basal food sources that occur because of seasonal flood *** trophic links within the aquatic communities of Poyang Lake are modified by water-level fluctuations.