Abstract
Microbial communities normally comprise a few core species and large numbers of satellite species. These two sub-communities have different ecological and functional roles in natural environments, but knowledge on the assembly processes and co-occurrence patterns of the core and satellite species in Tibetan lakes is still sparse. Here, we investigated the ecological processes and co-occurrence relationships of the core and satellite bacterial sub-communities in the Tibetan lakes via 454 sequencing of 16S rRNA gene. Our studies indicated that the core and satellite bacterial sub-communities have similar dominant phyla (Proteobacteria, Bacteroidetes, and Actinobacteria). But the core sub-communities were less diverse and exhibited a stronger distance-decay relationship than the satellite sub-communities. In addition, topological properties of nodes in the network demonstrated that the core sub-communities had more complex and stable co-occurrence associations and were primarily driven by stochastic processes (58.19%). By contrast, the satellite sub-communities were mainly governed by deterministic processes (62.17%). Overall, this study demonstrated the differences in the core and satellite sub-community assembly and network stability, suggesting the importance of considering species traits to understand the biogeographic distribution of bacterial communities in high-altitude lakes.
Highlights
In natural ecosystems, bacteria within a metacommunity could be partitioned into different ecological assemblages, such as abundant or rare sub-communities and core or satellite sub-communities in light of potential importance for the community function (Unterseher et al, 2011; Jeanbille et al, 2016; Lindh et al, 2017)
The core sub-communities in arbuscular mycorrhizal fungi (AMF) were mainly influenced by deterministic processes related to soil properties, whereas the satellite sub-communities were considerably influenced by stochastic processes (Barnes et al, 2016)
This study has provided a better understanding of assembly mechanisms and co-occurrence patterns of the core and satellite bacterial sub-communities across multiple Tibetan lakes
Summary
Bacteria within a metacommunity could be partitioned into different ecological assemblages, such as abundant or rare sub-communities and core or satellite sub-communities in light of potential importance for the community function (Unterseher et al, 2011; Jeanbille et al, 2016; Lindh et al, 2017). The core sub-communities are composed of the dominant species that are widely distributed and play a key role in the cycle of elements (Fuhrman, 2009; Pedrós-Alió, 2012), whereas the satellite sub-communities occur in low abundance and few locations and conduct specific metabolic functions, which constitute the seed bank of biodiversity (Pester et al, 2010; Van Der Gast et al, 2011; Lindh et al, 2017; Gendron et al, 2019) Up to now, this classification has proved to be a useful tool for understanding ecological principles of microorganisms, and has been applied in marine (Lindh et al, 2017) and rivers (Hu et al, 2017b) ecosystems, but has only infrequently been implemented in lake ecosystems. Co-occurrence network analysis provides powerful support for revealing the complex microbial community structure and interactions among microorganisms, which could reflect shared niches among community members in the real world (Faust and Raes, 2012; Mikhailov et al, 2019; Mingkun et al, 2020). Hu et al (2017b) demonstrated that due to different ecological niches, core and satellite sub-communities play different roles in the co-occurrence network and have different network topological characteristics
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