文献类型： 外文期刊

作者： Yue, Yihong ¹ ; Yang, Zhihong ¹ ; Wang, Fushun ¹ ; Chen, Xueping ¹ ; Huang, Yuxin ¹ ; Ma, Jing ¹ ; Cai, Ling ² ; Yang, Ming ¹ ;

作者机构： 1.Shanghai Univ, Sch Environm & Chem Engn, Shanghai, Peoples R China

2.Minist Nat Resources, Inst Oceanog 3, Xiamen, Peoples R China

3.Shanghai Acad Agr Sci, Inst Edible Fungi, Natl Res Ctr Edible Fungi Biotechnol & Engn,Minist, Key Lab Appl Mycol Resources & Utilizat,Shanghai K, Shanghai, Peoples R China

4.Minist Nat Resources, Observat & Res Stn Isl & Coastal Ecosyst Western T, Xiamen, Peoples R China

关键词： Cascade reservoirs; Sedimentary bacteria; Co-occurrence patterns; Community assembly; Nitrogen cycle genes

期刊名称：MICROBIAL ECOLOGY （ 影响因子：3.6； 五年影响因子：4.2 ）

ISSN： 0095-3628

年卷期： 2024 年 87 卷 1 期

页码：

收录情况： SCI

摘要： Dam construction as an important anthropogenic activity significantly influences ecological processes in altered freshwater bodies. However, the effects of multiple cascade dams on microbial communities have been largely overlooked. In this study, the spatiotemporal distribution, co-occurrence relationships, assembly mechanisms, and functional profiles of sedimentary bacterial communities were systematically investigated in 12 cascade reservoirs across two typical karst basins in southwest China over four seasons. A significant spatiotemporal heterogeneity was observed in bacterial abundance and diversity. Co-occurrence patterns in the Wujiang Basin exhibited greater edge counts, graph density, average degree, robustness, and reduced modularity, suggesting more intimate and stronger ecological interactions among species than in the Pearl River Basin. Furthermore, Armatimonadota and Desulfobacterota, identified as keystone species, occupied a more prominent niche than the dominant species. A notable distance-decay relationship between geographical distance and community dissimilarities was identified in the Pearl River Basin. Importantly, in the Wujiang Basin, water temperature emerged as the primary seasonal variable steering the deterministic process of bacterial communities, whereas 58.5% of the explained community variance in the neutral community model (NCM) indicated that stochastic processes governed community assembly in the Pearl River Basin. Additionally, principal component analysis (PCA) revealed more pronounced seasonal dynamics in nitrogen functional compositions than spatial variation in the Wujiang Basin. Redundancy analysis (RDA) results indicated that in the Wujiang Basin, environmental factors and in Pearl River Basin, geographical distance, reservoir age, and hydraulic retention time (HRT), respectively, influenced the abundance of nitrogen-related genes. Notably, these findings offer novel insights: building multiple cascade reservoirs could lead to a cascading decrease in biodiversity and resilience in the river-reservoir ecosystem.