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Dynamics of bacterial communities during a seasonal hypoxia at the Bohai Sea:Coupling and response between abundant and rare populations

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Journal of Environmental Sciences 2022年第1期34卷 324-339页

作者： Chao Wu Jinjun Kan dhiraj dhondiram narale Kun Liu Jun Sun Tianjin Key Laboratory of Marine Resources and Chemistry Tianjin University of Science and TechnologyTianjin 300457China Research Centre for Indian Ocean Ecosystem Tianjin University of Science and TechnologyTianjin 300457China Department of Microbiology Stroud Water Research CenterAvondalePA 19311USA Laboratory of Marine Biology and Ecology Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China College of Marine Science and Technology China University of Geosciences(Wuhan)Wuhan 430074China

Marine bacterial community plays a vital role in the formation of the hypoxia zone in coastal ***,their dynamics in the seasonal hypoxia zone of the Bohai Sea(BHS)are barely ***,the 16S r RNA gene-based high-throughput sequencing was used to explore the dynamics of their diversity,structure,and function as well as driving factors during the gradual deoxygenation process in the *** results evinced that the bacterial community was dominated by Proteobacteria,followed by Bacteroidetes,Firmicutes,Actinobacteria,and Cyanobacteria,*** abundant subcommunity dominated in the number of sequences(49%)while the rare subcommunity dominated in the number of species(99.61%).Although abundant subcommunity accounted for most sequences,rare subcommunity possessed higher diversity,richness and their population dramatically changed(higher turnover)during the hypoxia ***,co-occurrence network analysis proved the vital role of rare subcommunity in the process of community ***,beta diversity partition revealed that both subcommunities possessed a higher turnover component than nestedness and/or richness component,implying species replacement could explain a considerable percentage of community *** variation might be governed by both environmental selection and stochastic processes,and further,it influenced the nitrogen cycle(PICRUSt-based prediction)of the hypoxia ***,this study provides insight into the spatial-temporal heterogeneity of bacterial and their vital role in biogeochemical cycles in the hypoxia zone of the *** findings will extend our horizons about the stabilization mechanism,feedback regulation,and interactive model inside the bacterial community under oxygen-depleted ecosystems.

关键词： Bacterial community Hypoxia Stratification The Bohai Sea Nitrogen cycles High-throughput sequencing

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