PDF(Pubmed)
Abstract：
Microorganisms released into the atmosphere by various disturbances can travel significant distances before depositing, yet their impact on community assembly remains unclear. To address this, we examined atmospheric and lithospheric bacterial communities in 179 samples collected at two distinct Icelandic volcanic sites: a small volcanic island Surtsey, and a volcanic highland Fimmvörðuháls using 16S rRNA amplicon sequencing. Airborne microbial communities were similar between sites while significant differences emerged in the communities on lava rocks after 1-year exposure. SourceTracker analysis revealed distinct bacterial populations in the atmosphere and the lava rocks with surrounding soil contributed more significantly to lava rock microbial composition. Nevertheless, shared genera among air, rocks, and local sources, suggested potential exchange between these environments. The prevalent genera shared between rocks and potential sources exhibited stress-resistant properties, likely helping their survival during air transportation and facilitating their colonization of the rocks. We hypothesize that the atmosphere serves as a conduit for locally sourced microbes and stress-resistant distant-sourced microbes. Additionally, bacterial communities on the lava rocks of Fimmvörðuháls showed remarkable similarity after 1 and 9 years of exposure, suggesting rapid establishment. Our study reveals that atmospheric deposition significantly influences bacterial community formation, potentially influencing ecosystem dynamics and microbial communities\' resilience.
摘要：
通过各种干扰释放到大气中的微生物在沉积之前可以传播很长的距离，然而，它们对社区集会的影响仍不清楚。为了解决这个问题，我们检查了在两个不同的冰岛火山地点收集的179个样本中的大气和岩石圈细菌群落：一个小火山岛Surtsey，和使用16SrRNA扩增子测序的火山高地Fimmvörºuháls。地点之间的空气传播微生物群落相似，而暴露1年后，熔岩岩石上的群落出现了显着差异。SourceTracker分析显示，大气中不同的细菌种群以及周围土壤的熔岩对熔岩微生物组成的贡献更大。然而，在空气中共享属，岩石,和当地来源，建议这些环境之间的潜在交换。岩石和潜在来源之间共有的普遍属表现出抗应力特性，可能有助于他们在航空运输过程中的生存，并促进他们对岩石的殖民。我们假设大气是本地来源的微生物和抗压力的远程来源的微生物的管道。此外,在暴露1年和9年后，Fimmvörçuháls的熔岩岩石上的细菌群落显示出显着的相似性，建议快速建立。我们的研究表明，大气沉降显著影响细菌群落的形成，潜在影响生态系统动态和微生物群落的恢复力。
