Biogeographic patterns of meio- and micro-eukaryotic communities in dam-induced river-reservoir systems

作者全名:"Hu, Huan; Wei, Xing-Yi; Liu, Li; Wang, Yuan-Bo; Bu, Ling-Kang; Jia, Huang-Jie; Pei, De-Sheng"

作者地址:"[Hu, Huan; Wei, Xing-Yi; Wang, Yuan-Bo] Chongqing Jiaotong Univ, Chongqing 400074, Peoples R China; [Hu, Huan; Wei, Xing-Yi; Liu, Li; Wang, Yuan-Bo; Bu, Ling-Kang; Jia, Huang-Jie] Chinese Acad Sci, Univ Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing Sch, Chongqing 400714, Peoples R China; [Bu, Ling-Kang; Pei, De-Sheng] Chongqing Med Univ, Sch Publ Hlth, Chongqing 400016, Peoples R China"

通信作者:"Pei, DS (通讯作者),Chongqing Med Univ, Sch Publ Hlth, Chongqing 400016, Peoples R China."












关键词:Community assembly; Meio- and micro-eukaryotic composition; Stochastic and deterministic processes; Species interactions; Three Gorges Reservoir

摘要:"Although the Three Gorges Dam (TGD) is the world's largest hydroelectric dam, little is known about the spatial-temporal patterns and community assembly mechanisms of meio- and micro-eukaryotes and its two subtaxa (zooplankton and zoobenthos). This knowledge gap is particularly evident across various habitats and during different water-level periods, primarily arising from the annual regular dam regulation. To address this inquiry, we employed mitochondrial cytochrome c oxidase I (COI) gene-based environmental DNA (eDNA) metabarcoding technology to systematically analyze the biogeographic pattern of the three communities within the Three Gorges Reservoir (TGR). Our findings reveal distinct spatiotemporal characteristics and complementary patterns in the distribution of meio- and micro-eukaryotes. The three communities showed similar biogeographic patterns and assembly processes. Notably, the diversity of these three taxa gradually decreased along the river. Their communities were less shaped by stochastic processes, which gradually decreased along the longitudinal riverine-transition-lacustrine gradient. Hence, deterministic factors, such as seasonality, environmental, and spatial variables, along with species interactions, likely play a pivotal role in shaping these communities. Environmental factors primarily drive seasonal variations in these communities, while hydrological conditions, represented as spatial distance, predominantly influence spatial variations. These three communities followed the distance-decay pattern. In winter, compared to summer, both the decay and species interrelationships are more pronounced. Taken together, this study offers fresh insights into the composition and diversity patterns of meio- and micro-eukaryotes at the spatial-temporal level. It also uncovers the mechanisms behind community assembly in various environmental niches within the dam-induced river-reservoir systems. Key points Distribution and diversity of meio- and micro-eukaryotes exhibit distinct spatiotemporal patterns in the TGR. Contribution of stochastic processes in community assembly gradually decreases along the river. Deterministic factors and species interactions shape meio- and micro-eukaryotic community. [GRAPHICS] ."

基金机构:High-level Talents Project of Chongqing Medical University

基金资助正文:"We are grateful to the editor and anonymous reviewers for their valuable comments, enhancing the quality of this review."