文章基本信息

标题：Studies on the Food Web Structure of Lake Donghu Using Stable Carbon and Nitrogen Isotope Ratios
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作者：Jun Xu ; Ping Xie
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：2004
卷号：19
期号：4
页码：645-650
DOI：10.1080/02705060.2004.9664746
出版社：Taylor & Francis
摘要：Food web structure was studied by using carbon and nitrogen isotope ratios in a hypereutrophic subtropical Chinese lake, Lake Donghu. High external nutrient loading and the presence of abundant detritus from submersed macrophytes were responsible for the high sediment δ 13 N and δ 13 C, respectively. 13 C was significantly higher in submersed macrophytes than in other macrophytes. The similar δ 13 C values in phytoplankton, zooplankton, zoobenthos, and planktivorous fish indicate that phytoplankton was the major food source for the consumers. By using a δ 15 N mass balance model, we estimate that the contributions of zooplankton to the diet of silver carp and bighead carp were 54% and 74%, respectively, which is in agreement with previous microscopic observations on intestinal contents of these fishes.