PDF(Pubmed)
Abstract：
Clarifying the mechanisms underlying microbial community assembly from regional microbial pools is a central issue of microbial ecology, but remains largely unexplored. Here, we investigated the gut bacterial and fungal microbiome assembly processes and potential sources in Drosophila simulans and Dicranocephalus wallichii bowringi, two wild, sympatric insect species that share a common diet of waxberry. While some convergence was observed, the diversity, composition, and network structure of the gut microbiota significantly differed between these two host species. Null model analyses revealed that stochastic processes (e.g., drift, dispersal limitation) play a principal role in determining gut microbiota from both hosts. However, the strength of each ecological process varied with the host species. Furthermore, the source-tracking analysis showed that only a minority of gut microbiota within D. simulans and D. wallichii bowringi are drawn from a regional microbial pool from waxberries, leaves, or soil. Results from function prediction implied that host species-specific gut microbiota might arise partly through host functional requirement and specific selection across host-microbiota coevolution. In conclusion, our findings uncover the importance of community assembly processes over regional microbial pools in shaping sympatric insect gut microbiome structure and function.
摘要：
从区域微生物池中阐明微生物群落组装的潜在机制是微生物生态学的中心问题，但在很大程度上仍未被探索。这里,我们调查了模拟果蝇和双头鱼的肠道细菌和真菌微生物组组装过程和潜在来源，两个野生的，具有共同饮食的杨梅的同胞昆虫物种。虽然观察到一些收敛，多样性,composition,这两个宿主物种之间的肠道微生物群的网络结构显着不同。零模型分析显示，随机过程(例如，漂移,分散限制）在确定来自两个宿主的肠道微生物群中起主要作用。然而,每个生态过程的强度因宿主物种而异。此外，来源追踪分析显示，只有少数肠道微生物群内的D.simulans和D.wallichiibowringi是从一个区域微生物池中提取的，叶子,或土壤。功能预测的结果表明，宿主物种特异性肠道微生物群可能部分通过宿主功能需求和跨宿主微生物群协同进化的特定选择而产生。总之,我们的发现揭示了群落组装过程相对于区域微生物池在塑造共生昆虫肠道微生物组结构和功能方面的重要性.
