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脱氧会改变海洋中最大氧气最小区域的细菌多样性和群落组成。

Deoxygenation alters bacterial diversity and community composition in the ocean's largest oxygen minimum zone.

机构信息

Life and Environmental Sciences and Sierra Nevada Research Institute, University of California, 5200 North Lake Road, Merced, California 95343, USA.

出版信息

Nat Commun. 2013;4:2705. doi: 10.1038/ncomms3705.

Abstract

Oceanic oxygen minimum zones (OMZs) have a central role in biogeochemical cycles and are expanding as a consequence of climate change, yet how deoxygenation will affect the microbial communities that control these cycles is unclear. Here we sample across dissolved oxygen gradients in the oceans' largest OMZ and show that bacterial richness displays a unimodal pattern with decreasing dissolved oxygen, reaching maximum values on the edge of the OMZ and decreasing within it. Rare groups on the OMZ margin are abundant at lower dissolved oxygen concentrations, including sulphur-cycling Chromatiales, for which 16S rRNA was amplified from extracted RNA. Microbial species distribution models accurately replicate community patterns based on multivariate environmental data, demonstrate likely changes in distributions and diversity in the eastern tropical North Pacific Ocean, and highlight the sensitivity of key bacterial groups to deoxygenation. Through these mechanisms, OMZ expansion may alter microbial composition, competition, diversity and function, all of which have implications for biogeochemical cycling in OMZs.

摘要

海洋缺氧区(OMZs)在生物地球化学循环中起着核心作用,并且由于气候变化而不断扩大,然而脱氧将如何影响控制这些循环的微生物群落尚不清楚。在这里,我们在海洋中最大的 OMZ 的溶解氧梯度上进行采样,结果表明,细菌丰富度随着溶解氧的减少呈现单峰模式,在 OMZ 的边缘达到最大值,并在其内减少。在 OMZ 边缘丰富的稀有群体在较低的溶解氧浓度下含量丰富,包括硫循环的 Chromatiales,从提取的 RNA 中扩增了 16S rRNA。微生物物种分布模型基于多变量环境数据准确复制了群落模式,展示了东热带北太平洋分布和多样性的可能变化,并强调了关键细菌群体对脱氧的敏感性。通过这些机制,OMZ 的扩大可能会改变微生物的组成、竞争、多样性和功能,所有这些都对 OMZ 中的生物地球化学循环有影响。

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