Regionally divergent patterns of grass carp relative abundance, feeding habits and trophic niches in the subtropical Pearl River basin

文献类型： 外文期刊

第一作者： Zhang, Yingqiu

作者： Zhang, Yingqiu;Li, Xinhui;Zhu, Shuli;Li, Jie;Zhang, Yingqiu;Li, Xinhui;Zhu, Shuli;Li, Jie;Zhang, Yingqiu;Li, Xinhui;Zhu, Shuli;Li, Jie;Zhang, Yingqiu;Li, Xinhui;Zhu, Shuli;Li, Jie;Yu, Zonghe;Xu, Qinzeng

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关键词： Grass carp; Herbivory; Metabarcoding; Feeding habits; Stable isotopes; Trophic niche

期刊名称：AQUATIC ECOLOGY （ 影响因子：1.641； 五年影响因子：2.796 ）

ISSN： 1386-2588

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收录情况： SCI

摘要： The grass carp is one of the most important herbivore consumers in aquatic ecosystems and plays key roles in controlling macrophyte abundance. To assess the trophic role of grass carp and their potential grazing pressure on macrophytes in their native range, we quantified their relative abundance (RA), diet composition and trophic niches in two major tributaries and the central delta of the Pearl River using a fish capture survey, high-throughput analysis of the 18S rDNA sequences of their gut contents, and stable isotope analysis. The grass carp RA variation among the sampling regions was explained most by river discharge range. The RA was the highest in the West River with high discharge range, and the lowest in the central delta with low discharge range. The grass carp fed primarily on Streptophyta (relative read abundance: 0.40 +/- 0.33) and facultatively on Arthropoda, Rotifera, Ascomycota, and Chlorophyta. The Streptophyta proportion increased from the tributaries to the central delta. Such variation contributed most to the dietary difference among regions. Grass carp belonged to the second trophic level. The position and size of isotopic niche of grass carp differed among regions, and their niche breadth decreased from the tributaries to the central delta, as indicated by the corrected standard ellipse areas (SEAs) and the Bayesian SEAs. The regional differences in hydrological regime and grass carp RA probably affected the macrophyte distribution. The availability of macrophytes likely further contributed to the regional difference in the Streptophyta proportion in grass carp diet.

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