Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100101, China.
Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China.
FEMS Microbiol Ecol. 2020 Jun 1;96(6). doi: 10.1093/femsec/fiaa071.
Geographic patterns of bacteria and microeukaryotes have attracted increasing attention. However, mechanisms underlying geographic patterns in the community composition of both microbial groups are still poorly resolved. In particular, knowledge of whether bacterial communities and microeukaryotic communities are subject to the same or different assembly mechanisms is still limited. In this study, we investigated the biogeographic patterns of bacterial and microeukaryotic communities of 23 lakes on the Tibetan Plateau and quantified the relative influence of assembly mechanisms in shaping both microbial communities. Results showed that water salinity was the major driving force in controlling the community structures of bacteria and microeukaryotes. Although bacterial and microeukaryotic communities exhibited similar distance-decay patterns, the bacterial communities were mainly governed by environmental filtering (a niche-related process), whereas microeukaryotic communities were strongly driven by dispersal limitation (a neutral-related process). Furthermore, we found that bacteria exhibited wider niche breadths and higher dispersal ability but lower community stabilities than microeukaryotes. The similar distribution patterns but contrasting assembly mechanisms effecting bacteria and microeukaryotes resulted from the differences in dispersal ability and community stability. Our results highlight the importance of considering organism types in studies of the assembly mechanisms that shape microbial communities in microbial ecology.
地理模式的细菌和微型真核生物引起了越来越多的关注。然而，微生物群落组成的地理模式背后的机制仍未得到很好的解决。特别是，对于细菌群落和微型真核生物群落是否受到相同或不同的组装机制的影响，目前的知识仍然有限。在这项研究中，我们调查了青藏高原 23 个湖泊的细菌和微型真核生物群落的生物地理模式，并量化了组装机制在塑造这两种微生物群落中的相对影响。结果表明，水的盐度是控制细菌和微型真核生物群落结构的主要驱动力。尽管细菌和微型真核生物群落表现出相似的距离衰减模式，但细菌群落主要受环境过滤（与生态位相关的过程）控制，而微型真核生物群落则强烈受扩散限制（与中性过程相关）驱动。此外，我们发现细菌表现出更宽的生态位宽度和更高的扩散能力，但比微型真核生物群落更低的群落稳定性。细菌和微型真核生物的相似分布模式但不同的组装机制是由于扩散能力和群落稳定性的差异造成的。我们的研究结果强调了在微生物生态学中，考虑生物类型对塑造微生物群落的组装机制的重要性。
