Abstract
Low-head dams are becoming a ubiquitous feature of the landscape of headwater streams. The ecological effects of low-head dams have long been studied; however, most studies have ignored the invasion of native-invasive species commonly occurring in large streams. Based on fish data from 25 first-order streams within an important tributary of the Yangtze River, we investigated whether and how low-head dams facilitate the invasion of native-invasive fish to headwater streams in regions where native fish species are completely dominant. We found that the ratio of native-invasive species (Ratio) was significantly higher in impoundments than in free-flowing segments, suggesting that low-head dams facilitate the invasion of native-invasive fish. We demonstrated that the niche and dispersal processes affected the seasonal variation in Ratio differently. In addition, changes in the Ratio using abundance data were significantly related to landscape conditions and dam size in the dry season and only to landscape conditions in the wet season, suggesting that the latter greatly underestimated the blocking effect of low-head dams on fish dispersal. In conclusion, our study demonstrated that increasing anthropogenic landscape disturbances in catchments where low-head dams were located exacerbated the invasion of native-invasive species are commonly found in large streams.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (grant numbers: 31872251, 31500452, and 31372227) and the Special Fund for Anhui Agriculture Research System [Anhui Agricultural Science Letter No. (2021) 711]. We appreciate the support of the Provincial Key Laboratory of Biotic Environment and Ecological Safety in Anhui. This study was conducted with permission from the Animal Ethics Committee of Anhui Normal University. We would like to express our gratitude to Andy Dzialowski, and two anonymous reviewers for their comments, which significantly improved the manuscript.
Funding
National Natural Science Foundation of China (Grant Nos. 31372227, 31872251, 31500452), and Special Fund for Anhui Agriculture Research System, [Anhui Agricultural Science Letter No. (2021) 711.
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YY and QL designed the study. QL, YZ, LC, and YY conducted the field and/or laboratory work. QL and YZ analyzed the data. LC and YZ contributed materials, reagents and/or analysis tools. QL drafted the manuscript, with assistance from YY.
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Li, Q., Zhang, Y., Chu, L. et al. Low-head dams facilitate the native invasion of downstream fishes to subtropical headwater streams, China. Hydrobiologia 850, 1897–1909 (2023). https://doi.org/10.1007/s10750-023-05200-y
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DOI: https://doi.org/10.1007/s10750-023-05200-y