Abstract
Purpose
Microorganisms are an essential component of riverine ecosystems. However, the assembly mechanisms of riverine microbial sub-communities with different rarity are poorly understood. Thus, this study aimed to examine the assembly mechanisms of microbial communities and the sub-communities with different rarity in soils, sediments, and water along the Nu River.
Materials and methods
Water, sediment, and riparian soil samples were collected from 20 sites along the Nu River. The microbial abundance and diversity were examined via real-time PCR and Illumina amplicon high-throughput sequencing, respectively. The assembly mechanisms of microbial communities and the sub-communities with different rarity were determined based on iCAMP which is a recently developed phylogenetic bin-based null model analysis method.
Results and discussion
The results showed that microbial abundance, diversity, and community profiles significantly differed among different habitats. The microbial community assembly was mainly driven by homogeneous selection, dispersal limitation, and drift. With an increase in rarity, the contribution of drift and homogenizing dispersal to the assembly of microbial sub-communities significantly increased, while the contribution of homogeneous selection showed a reverse trend. This study also showed that the contribution of stochastic and deterministic processes to the microbial community assembly was significantly correlated with geographic distance and environmental factors, respectively.
Conclusions
These findings suggest that the assembly mechanisms of riverine microbial sub-communities with different rarity are distinct, improving our understanding of riverine microbial diversity maintenance mechanisms.
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Funding
This work was supported by the Second Tibetan Plateau Scientific Expedition and Research (STEP) program (grant number 2019QZKK0502), Yunnan Fundamental Research Projects (grant number 202101AT070563), the National Natural Science Foundation of China (grant number 42007035), the China-Myanmar Joint Laboratory of Eco-environmental Conservation (grant number 202003AF140003), the Strategic Priority Research Program of the Chinese Academy of Sciences (grant number XDA26020203), Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments (grant number 2018DG005), and the start-up funding from Yunnan University (grant number C176220100024).
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Zhang, S., Li, K., Hu, J. et al. Distinct assembly mechanisms of microbial sub-communities with different rarity along the Nu River. J Soils Sediments 22, 1530–1545 (2022). https://doi.org/10.1007/s11368-022-03149-4
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DOI: https://doi.org/10.1007/s11368-022-03149-4