Trophic niche diversity and redundancy across trophic positions in a subtropical river fish assemblage

文献类型： 外文期刊

第一作者： Zhang, Yingqiu

作者： Zhang, Yingqiu;Li, Jie;Li, Yuefei;Zhang, Yingqiu;Tarkan, Ali Serhan;Britton, J. Robert;Zhang, Yingqiu;Li, Jie;Li, Yuefei;Zhang, Yingqiu;Li, Jie;Li, Yuefei;Li, Jie;Li, Yuefei;Tarkan, Ali Serhan;Liu, Chunlong

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关键词： Stable isotopes; Trophic niche; Trophic position; Biomass; Fish; Pearl River

期刊名称：HYDROBIOLOGIA （ 影响因子：2.6； 五年影响因子：2.6 ）

ISSN： 0018-8158

年卷期： 2024 年 851 卷 10 期

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收录情况： SCI

摘要： Understanding consumer-resource interactions is essential for understanding the trophic dynamics of species-rich fish communities. Woodland et al. (Oikos 125:556-565, 2016) assumed that trophic position (TP) distributions of primary consumers and tertiary species are restricted versus intermediate consumers tending to be omnivores with broader TP distribution, where these omnivores often dominate the overall biomass. With rare evidence supporting this hypothesis in a river, we tested it in the species-rich Pearl River fish assemblage, China. Using bulk stable isotope (SI) approach (delta 13C, delta 15N), the TPs, SI distribution parameters, isotopic niche sizes (as standard ellipse areas, SEA) and interspecific niche overlap were calculated for the abundant fish species. Fishes of intermediate TPs (i.e. omnivores) had larger delta 13C variance/ range, broader isotopic niches and higher niche overlap compared to fishes at low TPs and high TPs, indicating a higher degree of trophic redundancy among the omnivores, whereas high TP fish had narrower niche and lower niche overlap, indicating trophic partitioning among tertiary species. These omnivores at intermediate TPs between 2.4 and 2.8 dominated fish biomass. The results not only support the Woodland et al. (Oikos 125:556-565, 2016) hypothesis in the river, but also provide a novel explaining in how niche sizes and overlap vary by TP.

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