The temporal and spatial variations of fish communities and β-diversity in stock enhancement waters：A case study of the Zangmu reaches of the Yarlung Zangbo River

doi:10.14088/j.cnki.issn0439-8114.2025.07.022

Abstract

Abstract: To understand the changes in fish community structure in stock enhancement waters, continuous survey data on fish resources from the Zangmu reaches of the Yarlung Zangbo River from 2017 to 2022 were used. By decomposing β-diversity, this study analyzed the changes in fish community structure and the mechanisms of succession and stability. The results showed that 30 fish species were surveyed in the Zangmu reaches of the Yarlung Zangbo River. From 2017 to 2020, the dominant fish species were all native species, whereas from 2021 to 2022, the dominant species included non-native species. Both β_sor (total β-diversity) and β_sne (nestedness component) showed significant differences between different years(P<0.05), indicating that changes in fish species composition across years were mainly due to changes in the nestedness component. β_sim (turnover component) showed significant spatial differences (P<0.05), specifically in species turnover of non-native fish. The stock enhancement had positive implications for the conservation of native fish. Overall, β_sim was significantly greater than β_sne(P<0.05), indicating that species composition changes in the Zangmu reaches of the Yarlung Zangbo River were mainly driven by turnover, highlighting the conservation of each river reach. This study provided a scientific reference for stock enhancement efforts in water conservancy projects by analyzing β-diversity and its components from the perspective of changes in fish composition.

Key words: stock enhancement, β-diversity, fish community structure, Yarlung Zangbo River

CLC Number:

Q958

QUE Pei-zhong, DU Chun-zhong, DING Yao, LU Qing-xian, GU Zheng-xuan, WANG Shi-jun, LU Xing-yu, ZHANG Huan, WU Lei. The temporal and spatial variations of fish communities and β-diversity in stock enhancement waters：A case study of the Zangmu reaches of the Yarlung Zangbo River[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(7): 128-132.

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