Abstract
Dam construction and impoundment cause discontinuities in the natural biophysical gradients in rivers. These discontinuities may alter distinctive habitats and different microbial community assembly mechanisms upstream and downstream of dams, which reflect the potential impacts of damming on riverine aquatic ecosystems. In this study, we investigated the planktonic microbial assemblages of three large dams in the upper Yangtze River by using high-throughput sequencing. The results revealed that the alpha diversity indexes increased downstream of the dams. In addition, more eukaryotic ASVs solely occurred downstream of the dams, which indicated that a large proportion of eukaryotes appeared downstream of the dams. The nonmetric multidimensional scaling analysis indicated that there was no obvious geographic clustering of the planktonic microbial assemblages among the different locations or among the different dams. However, the dam barriers changed dam-related variables (maximum dam height and water level) and local environmental variables (water temperature, DOC, etc.) that could possibly affect the assembly of the planktonic microbial communities that are closest to the dams. A co-occurrence network analysis demonstrated that the keystone taxa of the planktonic bacteria and eukaryotes decreased downstream of the dams. In particular, the keystone taxa of the eukaryotes disappeared downstream of the dams. The robustness analysis indicated that the natural connectivity of the microbial networks decreased more rapidly upstream of the dams, and the downstream eukaryotic network was more stable. In conclusion, damming has a greater impact on planktonic eukaryotes than on bacteria in near-dam areas, and planktonic microbial assemblages were more susceptible to the environmental changes. Our study provides a better understanding of the ecological effects of river damming.
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Acknowledgements
We thank Wei Tan, Qi Zhang, and Xing Chen, who participated in the field sampling campaigns.
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This study is supported by The National Natural Science Foundation of China (Project No. 51861125204 and 52039006) and the Chongqing Bureau of Science and Technology (Project No. cstc2020jscx-msxmX0121 and No. cstc2020jcyj-jqX0010). Dr. Lu, and Dr. Li were also supported by the “Light of West” Program funded by the Chinese Academy of Sciences.
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H. Li: methodology, writing-original draft. Q. Tang: review and editing, data analysis. R. Li: methodology, review, and editing. Z. Li: conceptualization, review, and editing, funding acquisition. L. Lu: investigation, experiment, writing—original draft, review, and editing.
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Li, H., Li, Z., Tang, Q. et al. Local-Scale Damming Impact on the Planktonic Bacterial and Eukaryotic Assemblages in the upper Yangtze River. Microb Ecol 85, 1323–1337 (2023). https://doi.org/10.1007/s00248-022-02012-w
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DOI: https://doi.org/10.1007/s00248-022-02012-w