期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 690, 期 -, 页码 50-60出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.07.014
关键词
Community assembly; Microbial community; Three Gorges Reservoir; Sediment; Exact sequencing variants
资金
- National Key R&D Program of China [2016YFC0401703]
- National Natural Science Foundation of China [51779076]
- Fundamental Research Funds for the Central Universities [2018B14614]
- Science Fund for Creative Research Groups of the National Natural Science Foundation of China [51421006]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP)
Deep-water reservoir sediment is a unique habitat sheltering indispensable microorganisms and facilitating their biogeochemical functions; however, the assembly processes of the microbial community therein remain elusive. This study focuses on the assembly processes in the Three Gorges Reservoir Area (TGRA). A total of 42 sediment samples were collected from the TGRA, both in the mainstream and the tributaries, and in different seasons. Metagenomic analyses of 16S rRNA using Exact Sequence Variants revealed the spatiotemporal distribution patterns of the microbial communities. Linear regressions between dissimilarity of microbial communities, geographic and environmental distance showed that environmental, rather than geographic factors, impacted the microbial community. However, the environmental differences explained little variations (14.14%) in community structure, implying the homogeneity of environmental conditions across the TGRA From the quantification of ecological processes, homogeneous selection was shown to be a dominating factor (51.34%) in the assembly of the microbial communities. The co-occurrence network showed that keystone species were more important than prevalent abundant species in interspecies interactions. Overall, the assembly of microbial community in the deep-water reservoir sediment is mediated by both deterministic and stochastic processes, and homogeneous selection plays a leading role. (C) 2019 Elsevier B.V. All rights reserved.
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