Distribution Patterns of Iron-Oxidizing Zeta- and Beta-Proteobacteria From Different Environmental Settings at the Jan Mayen Vent Fields
Distribution Patterns of Iron-Oxidizing Zeta- and Beta-Proteobacteria From Different Environmental Settings at the Jan Mayen Vent Fields
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DOI：
10.3389/fmicb.2018.03008
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发表时间：
2018-12
影响因子：
5.2
通讯作者：
Jan vander Roost;F. Daae;I. Steen;I. Thorseth;H. Dahle
中科院分区：
文献类型：
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作者：
Jan vander Roost;F. Daae;I. Steen;I. Thorseth;H. Dahle
铁氧化剂广泛存在于海洋环境中，在海洋铁循环中起着重要作用。然而，很少有人知道铁氧化剂在热液系统中的总体分布，包括设置很少的热液活动。此外，在何种程度上不同的系统发育组的铁氧化剂表现出生态位专业化对不同的环境设置，在很大程度上仍然未知。获得这些知识对于揭示铁氧化剂活性的影响以及它们如何适应至关重要。在这里，我们使用16 S rRNA测序来表征分布的铁氧化剂在不同的环境设置内的一月马延热液喷口领域（JMVFs）。推定的铁氧化剂隶属于Zetaproteobacteria和Betaproteobacteria内检测到铁丘，底部海水，玄武岩表面，沉积物的表层。将检测到的铁氧化剂与先前在JMVFs与扩散通风相关的斑块状分布的铁垫中观察到的序列类型进行了比较。大多数OTU的铁氧化剂在不同的环境设置下重新出现，表明有限程度的生态位专业化。因此，大多数检测到的铁氧化剂似乎是一个大的栖息地范围的通才。我们的研究强调了收集有关铁氧化剂在热液系统中的总体分布信息的重要性，以充分了解这一代谢组在铁循环中的作用。此外，我们的研究结果提供了在海洋环境中的Betaproteobacteria的铁氧化成员的存在进一步的证据。
Iron oxidizers are widespread in marine environments and play an important role in marine iron cycling. However, little is known about the overall distribution of iron oxidizers within hydrothermal systems, including settings with little hydrothermal activity. Moreover, the extent to which different phylogenetic groups of iron oxidizers exhibit niche specialization toward different environmental settings, remains largely unknown. Obtaining such knowledge is critical to unraveling the impact of the activity of iron oxidizers and how they are adapted. Here, we used 16S rRNA sequencing to characterize the distribution of iron oxidizers in different environmental settings within the Jan Mayen hydrothermal vent fields (JMVFs). Putative iron oxidizers affiliated to Zetaproteobacteria and Betaproteobacteria were detected within iron mounds, bottom seawater, basalt surfaces, and surface layers of sediments. The detected iron oxidizers were compared to sequence types previously observed in patchily distributed iron mats associated with diffuse venting at the JMVFs. Most OTUs of iron oxidizers reoccurred under different environmental settings, suggesting a limited degree of niche specialization. Consequently, most of the detected iron oxidizers seem to be generalists with a large habitat range. Our study highlights the importance of gathering information about the overall distribution of iron oxidizers in hydrothermal systems to fully understand the role of this metabolic group regarding cycling of iron. Furthermore, our results provide further evidence of the presence of iron-oxidizing members of Betaproteobacteria in marine environments.