Deoxygenation alters bacterial diversity and community composition in the ocean's largest oxygen minimum zone
Deoxygenation alters bacterial diversity and community composition in the ocean's largest oxygen minimum zone
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DOI：
10.1038/ncomms3705
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发表时间：
2013-10-01
影响因子：
16.6
通讯作者：
Carolan, Molly T.
中科院分区：
文献类型：
--
作者：
Beman, J. Michael;Carolan, Molly T.
海洋氧气最小区(OMZ)在生物地球化学循环中发挥着核心作用，并随着气候变化而不断扩大，但脱氧作用将如何影响控制这些循环的微生物群落尚不清楚。在这里，我们在海洋最大的OMZ的溶解氧梯度上进行采样，表明细菌丰度呈现单峰模式，溶解氧减少，在OMZ边缘达到最大值，并在OMZ内减少。在较低的溶氧浓度下，OMZ边缘的稀有基团丰富，包括硫循环色目，从提取的RNA中扩增出16S rRNA。微生物物种分布模型准确地复制了基于多变量环境数据的群落模式，展示了热带北太平洋东部的分布和多样性可能发生的变化，并突出了关键细菌群对脱氧的敏感性。通过这些机制，OMZ的扩张可能改变微生物的组成、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产生影响。
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.