Details

Autor(en) / Beteiligte

• Li, Yi
• Gao, Yu
• Zhang, Wenlong
• Wang, Chao
• Wang, Peifang
• Niu, Lihua
• Wu, Hainan

Titel

Homogeneous selection dominates the microbial community assembly in the sediment of the Three Gorges Reservoir

Ist Teil von

• The Science of the total environment, 2019-11, Vol.690, p.50-60

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• 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. [Display omitted] •Ecological processes (selection, dispersal, drift, etc.) are focused in microbial communities of deep-water reservoirs•The Three Gorges Reservoir Area, the largest hydroelectric reservoir, is selected as the research area•The metagenomic analyses are based on Exact Sequence Variants (ESVs) rather than clustered Operational Taxa Units (OTUs)•Homogeneous selection dominates the assembly of microbial communities in the deep-water reservoir•Natural selection, anthropogenic disturbances and interspecies interactions impact the ecological processes together.