Spatio-temporal distribution of fish in the Pengxi River arm of the Three Gorges reservoir

Ren, Yuqin; Daqing, 陈大庆 Chen; Shaoping, 刘绍平 Liu; Xinbin, 段辛斌 Duan; Shijian, 李世健 Li; Sheng, 王生 Wang; Ke, 王珂 Wang

doi:10.5846/stxb201103010249

Acta Eco Sin

2012

DOI: 10.5846/stxb201103010249

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Spatio-temporal distribution of fish in the Pengxi River arm of the Three Gorges reservoir

Yuqin Ren¹,

陈大庆 Chen Daqing²,

刘绍平 Liu Shaoping³

et al.

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Impact of a dam on wintering waterbirds’ habitat use

Zeng

Cai

et al. 2017

Envir. Conserv.

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SUMMARYThe degradation, alteration and depletion of riparian habitats caused by river regulation are among critical conservation concerns. Aquatic and riparian habitats support not only river-dwelling biota such as macroinvertebrates and fish, but also waterbirds, the top predators in the aquatic food web. Despite the intimate relationships between fish and waterbirds, the two groups are often investigated separately. Using an integrative approach, we examined the effects of dams on fish and scaly-sided merganser (Mergus squamatus), an endangered, iconic riverine species, where the lack of knowledge about habitat preferences greatly hampers long-term conservation efforts. Our analysis quantified three causal links: (1) water depth had direct, comparable, negative effects on both fish and waterbirds, and the path coefficients for fish and birds are –0.31 and –0.46, respectively; (2) river landscape heterogeneity directly and positively affected fish and waterbirds, and the path coefficients for fish and birds are 0.63 and 0.19, respectively; and (3) depth and river landscape also exerted indirect effects on waterbirds through their impacts on fish abundance, and the path coefficients for fish and birds are –0.15 and 0.28, respectively. Our findings could contribute to the rational spatial planning and sustainable operation of dams in that maintaining instream habitat availability and heterogeneity would benefit the whole riverine ecosystem.

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Impact of a dam on wintering waterbirds’ habitat use

Zeng

Cai

et al. 2017

Envir. Conserv.

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Response of Fish Trophic Niche to Water Level Regulation of the Three Gorges Reservoir in its Backwater Bay Using a Stable Isotope Approach

Rong-jing

Zhan

Tao

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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To date, our ability to speculate how species interactions will change temporally and spatially in response to WLR still inadequate, especially within large river-reservoir ecosystems. Fish communities in backwater bay of the Xiaojiang River of the TGR (Three Gorges Reservoir) were studied in 2010 and 2016 using a stable isotope approach to explore variations in fish trophic niches associated WLR. We found that fish assemblages tended to have broader trophic diversity spaces in LBAs (large backwater areas) at a water depth of 175 m, suggesting that the assimilation of food resources might come from a greater diversity of habitats or prey items with distinct isotopic signatures. Many among-fish species trophic niches tended to overlap and have broader ranges in LBAs compared to SBAs (small backwater areas) at a water depth of 145 m, which indicated that the processes of impounding at 175 m can provide more similar food resources for different fish species. Our findings highlight that WLR dynamics are typical characteristics of the backwater bay of the Xiaojiang River aquatic ecosystems caused by the operations of the TGR, which has significant ecological effects on the fish trophic structure within this community. Understanding the pattern of changes in fish trophic niche associated with WLR will be meaningful for fishery resources management of the other tributaries in the TGR.

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Spatio-temporal distribution of fish in the Pengxi River arm of the Three Gorges reservoir

Cited by 2 publications

References 0 publications

Impact of a dam on wintering waterbirds’ habitat use

Impact of a dam on wintering waterbirds’ habitat use

Response of Fish Trophic Niche to Water Level Regulation of the Three Gorges Reservoir in its Backwater Bay Using a Stable Isotope Approach

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