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Food Chain Length Associated with Environmental Factors Affected by Large Dam along the Yangtze River

文献类型： 外文期刊

作者： He, Chun 1 ; Deng, Huatang 2 ; Ba, Jiawen 3 ; Li, Sheng 1 ; Chen, Zheyu 1 ; Tao, Yixi 1 ; Duan, Xinbin 2 ; Liu, Shaoping; 1 ;

作者机构： 1.Southwest Univ, Inst Three Gorges Ecol Fisheries Chongqing, Coll Fisheries, Chongqing 400715, Peoples R China

2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Fishery Resources & Environm Sci Expt Stn Upper M, Minist Agr & Rural Affairs, Wuhan 430223, Peoples R China

3.Tongren Univ, Coll Agr & Forestry Projects & Planning, Tongren 554300, Peoples R China

4.Southwest Univ, Key Lab Aquat Sci Chongqing, Key Lab Freshwater Fish Reprod & Dev, Minist Educ, Chongqing 400715, Peoples R China

关键词： food chain length; Yangtze River; stable isotope; ecosystem size; resource availability; Three Gorges Dam

期刊名称：WATER （ 影响因子：3.103； 五年影响因子：3.229 ）

ISSN：

年卷期： 2020 年 12 卷 11 期

页码：

收录情况： SCI

摘要： Food chain length (FCL) is a critical measure of food web complexity that influences the community structure and ecosystem function. The FCL of large subtropical rivers affected by dams and the decisive factors are far beyond clear. In this study, we used stable isotope technology to estimate the FCL of fish in different reaches of the main stream in the Yangtze River and explored the key factors that determined the FCL. The results showed that FCL varied widely among the studied areas with a mean of 4.09 (ranging from 3.69 to 4.31). The variation of FCL among river sections in the upstream of the dam was greater than that in the downstream. Regression analysis and model selection results revealed that the FCL had a significant positive correlation with ecosystem size as well as resource availability, and FCL variation was largely explained by ecosystem size, which represented 72% of the model weight. In summary, our results suggested that ecosystem size plays a key role in determining the FCL in large subtropical rivers and large ecosystems tend to have a longer food chain. Additionally, the construction of the Three Gorges Dam has been speculated to increase the FCL in the impoundment river sections.

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