Deng Chao, Huang Shixia, Chen Bolin, Huang Rong, Zhang Jiaqi, Xiao Zhihui, Ma Chengcheng, Wang Zhijian, Liu Xiaohong
Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education), Key Laboratory of Aquatic Science of Chongqing, School of Life Sciences, Southwest University Chongqing 400715, China.
School of Agronomy, Xinjiang Hetian College, Hetian 848000, China.
Animals (Basel). 2025 Jul 10;15(14):2031. doi: 10.3390/ani15142031.
The Fujiang River, a first-order branch of Jialing River, has for years been separated into six segments by six cascading hydropower stations in its downstream. However, the impact of cascading hydropower stations on its aquatic biota communities remains unclear.
eDNA samples were collected in the upper, middle, and lower reaches of each river fragment during March, May, July, and December 2023, and after species identification, various statistical analyses including β-diversity, NMDS and MantelTest were performed using the R platform.
A total of 82 fish species belonging to 15 families were identified. The fish communities in the six fragments of the downstream Fujiang River showed a high degree of overlap, and a notable aggregation of fish communities between the upper, middle, and lower areas within each river section was also observed. Flow velocity (FV) and water temperature (TEMP) were found to be important factors in shaping fish distribution.
Fish composition and distribution trend towards homogenization in the downstream of the Fujiang River.
涪江是嘉陵江的一级支流，多年来其下游被六个梯级水电站分隔为六个河段。然而，梯级水电站对其水生生物群落的影响仍不明确。
于2023年3月、5月、7月和12月在各河段的上游、中游和下游采集环境DNA（eDNA）样本，物种鉴定后，使用R平台进行包括β多样性、非度量多维尺度分析（NMDS）和Mantel检验在内的各种统计分析。
共鉴定出15科82种鱼类。涪江下游六个河段的鱼类群落显示出高度重叠，且在每个河段的上、中、下游区域之间也观察到鱼类群落的显著聚集。发现流速（FV）和水温（TEMP）是影响鱼类分布的重要因素。
涪江下游鱼类组成和分布趋于同质化。
