Diet of Leptobotia elongata revealed by stomach content analysis and inferred from stable isotope signatures

文献类型： 外文期刊

第一作者： Li, L.

作者： Li, L.;Wei, Q. Wei;Liu, Y.;Li, L.;Wei, Q. Wei;Wu, J. Ming;Xie, X.;Zhang, H.

作者机构：

关键词： Leptobotia elongata;Dietary shift;Body length;Season;Stomach contents;Stable isotope

期刊名称：ENVIRONMENTAL BIOLOGY OF FISHES （ 影响因子：1.844； 五年影响因子：1.839 ）

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年卷期：

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收录情况： SCI

摘要： The diet of Leptobotia elongata in the Yibin reach of the Yangtze River, China was investigated by stomach content analysis and by stable isotope analysis from muscle. The results of the two methods were agreement. Both stomach contents and isotope analysis indicated that L. elongata fed in spring mainly on plankton, shrimp and fish, and secondarily on benthic invertebrates and aquatic insect larvae. For the stomach content analysis, the diet composition showed significant differences among the size classes in relative weight of prey items, with L. elongata changing feeding habits at c.110 mm standard length. The smaller individuals fed on benthic invertebrates and aquatic insect larvae, whereas individuals > 109 mm fed mainly on shrimp and fish. A similar shift to piscivory at c.110 mm standard length was found using the stable isotope mixing model to reveal dietary ontogeny by IsoSource software, and the trend in variation of the delta C-13 and delta N-15 was similar with increased body length, and the plankton is important prey item in all size classes. The delta C-13 and delta N-15 values in similar sized individuals showed significant seasonal differences (delta C-13, ANOVA, F = 76.33, p < 0.001 and delta N-15, ANOVA, F = 144.56, p < 0.001), indicating a temporal dietary and trophic level shift. L. elongata is an important commercial species, and the results of the study form part of a detailed investigation of feeding ecology of L. elongata that provides basic data for studying the food web of the upper Yangtze River.

分类号： S9

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