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Variations of trophic structure and niche space in fish community along a highly regulated subtropical large river

文献类型： 外文期刊

作者： Ru, Huijun 1 ; Zhong, Liqiao 1 ; Nian, Wei 1 ; Li, Yunfeng 1 ; Sheng, Qiang 2 ; Ni, Zhaohui 1 ;

作者机构： 1.Chinese Acad Fisheries Sci, Fishery Ecoenvironm Monitoring Ctr Middle & Upper, Minist Agr & Rural Affairs China, Yangtze River Fisheries Res Inst, Wuhan, Hubei, Peoples R China

2.Huzhou Univ, Coll Life Sci, Zhejiang Prov Key Lab Aquat Resources Conservat &, Huzhou, Peoples R China

关键词： dam construction; energy flow; food webs; hydrogeomorphological condition; stable isotope niche

期刊名称：ECOLOGY AND EVOLUTION （ 影响因子：3.167； 五年影响因子：3.445 ）

ISSN： 2045-7758

年卷期： 2022 年 12 卷 10 期

页码：

收录情况： SCI

摘要： The trophic interactions between consumers and resources play a vital role in the stability of communities. In river systems, fragmentation of natural habitats and environmental changes alters the energy basis and community composition, consequently leading to variations in the community's trophic structure and niche space. However, our understanding of how the trophic structure responds to environmental changes is still very limited. Here, based on stable isotope data, we explored and compared trophic positions (TPs), community-wide trophic metrics, and isotope niche space of fish communities in three reaches with different hydrogeomorphic conditions along a highly regulated subtropical river over three seasons. The community trophic structure and niche space showed notable spatiotemporal variations. Overall, the downstream reach had lower TPs, trophic diversity but higher trophic redundancy. The middle reach occupied a wider isotope niche space than other reaches, with the largest niche size during autumn. Furthermore, the niche overlap was relatively high in winter between reaches and in the downstream between seasons. The results implied a homogenization of feeding functional groups and energy flow pathways of species in the downstream community associated with the change of energy source and stability of hydrological conditions. The relationship between trophic structure and environmental factors suggested that the dam-induced alteration in hydrological-related aspects may drive the changes in the functional group composition, together with changes in energy basis, resulting in differences in the trophic structure of the community. The results of the present study deepen our understanding of how ecosystem functions respond to disturbance, thus contributing to improved ability to conserve river ecosystems.

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