PDF(Pubmed)
Abstract：
Burrowing animals are a critical driver of terrestrial ecosystem functioning, but we know little about their effects on soil microbiomes. Here, we evaluated the effect of burrowing animals on microbial assembly processes and co-occurrence patterns using soil microbiota from a group of habitats disturbed by Plateau pikas (Ochtona curzoniae). Pika disturbance had different impacts on bacterial and fungal communities. Fungal diversity generally increased with patch area, whereas bacterial diversity decreased. These strikingly different species-area relationships were closely associated with their community assembly mechanisms. The loss of bacterial diversity on larger patches was largely driven by deterministic processes, mainly due to the decline of nutrient supply (e.g., organic C, inorganic N). In contrast, fungal distribution was driven primarily by stochastic processes that dispersal limitation contributed to their higher fungal diversity on lager patches. A bacterial co-occurrence network exhibited a positive relationship of nodes and linkage numbers with patch area, and the fungal network presented a positive modularity-area relationship, suggesting that bacteria tended to form a closer association community under pika disturbance, while fungi tended to construct a higher modularity network. Our results suggest that pikas affects the microbial assembly process and co-occurrence patterns in alpine environments, thereby enhancing the current understanding of microbial biogeography under natural disturbances.
摘要：
洞穴动物是陆地生态系统功能的关键驱动因素，但是我们对它们对土壤微生物组的影响知之甚少。这里,我们使用来自一组受高原鼠兔(Ochtonacurzoni)干扰的栖息地的土壤微生物群,评估了挖土动物对微生物组装过程和共生模式的影响.鼠兔干扰对细菌和真菌群落有不同的影响。真菌多样性一般随着斑块面积的增加而增加，而细菌多样性下降。这些截然不同的物种与地区关系与其群落聚集机制密切相关。较大斑块上细菌多样性的丧失主要是由确定性过程驱动的，主要是由于营养素供应的下降(例如，有机C,无机氮）。相比之下,真菌的分布主要是由随机过程驱动的，该过程的扩散限制导致了它们在较大斑块上的较高真菌多样性。细菌共生网络表现出节点和连锁数与斑块面积的正相关关系，真菌网络呈现积极的模块化-区域关系，表明细菌在鼠兔干扰下倾向于形成更紧密的联系社区，而真菌倾向于构建更高的模块化网络。我们的结果表明，鼠兔会影响高山环境中的微生物组装过程和共现模式，从而增强了当前对自然干扰下微生物生物地理学的理解。
