Bacterial Diversity and Biogeochemistry of Two Marine Shallow-Water Hydrothermal Systems off Dominica (Lesser Antilles).
Bacterial Diversity and Biogeochemistry of Two Marine Shallow-Water Hydrothermal Systems off Dominica (Lesser Antilles).
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DOI：
10.3389/fmicb.2017.02400
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发表时间：
2017
影响因子：
5.2
通讯作者：
Bühring SI
中科院分区：
文献类型：
--
作者：
Pop Ristova P;Pichler T;Friedrich MW;Bühring SI
浅水热液系统代表了具有独特生物地球化学和高生物生产力的极端环境，自养微生物利用光能和化学能生产生物质。这些生态系统的微生物群落代谢多样，具有转化大范围化合物的能力。然而，人们对它们的多样性或形成其结构的因素知之甚少，也不知道它们与未受热液作用影响的沿海沉积物相比如何。为此，我们利用自动核糖体基因间间隔分析（ARISA）和高通量Illumina测序结合孔隙水地球化学分析，研究了多米尼加岛（小安的列斯群岛）两个浅水热液系统沿地球化学梯度的微生物群落。在这两个地点，热液流体的喷发使孔隙水富含二氧化硅、铁和溶解的无机碳，从而极大地改变了孔隙水的地球化学特征，形成了具有独特生物地球化学特征的岛状栖息地。流体流动的大小和泥沙粒度的差异阻碍了流体与海水的混合，这与观测到的两个地点孔隙水地球化学的差异有关。同时，不同地点的微生物群落结构也存在显著差异。这些差异可能在统计上与孔隙水地球化学和热液流体的变化有关。多米尼加的两个浅水热液系统拥有高度分类和代谢多样性的细菌群落，主要是与γ变形菌属假单胞菌和假互变单胞菌相关的异养微生物，表明异养过程的重要性。总体而言，本研究表明浅水热液系统对海岸沉积物的生物地球化学异质性和细菌多样性有重要贡献。
Shallow-water hydrothermal systems represent extreme environments with unique biogeochemistry and high biological productivity, at which autotrophic microorganisms use both light and chemical energy for the production of biomass. Microbial communities of these ecosystems are metabolically diverse and possess the capacity to transform a large range of chemical compounds. Yet, little is known about their diversity or factors shaping their structure or how they compare to coastal sediments not impacted by hydrothermalism. To this end, we have used automated ribosomal intergenic spacer analysis (ARISA) and high-throughput Illumina sequencing combined with porewater geochemical analysis to investigate microbial communities along geochemical gradients in two shallow-water hydrothermal systems off the island of Dominica (Lesser Antilles). At both sites, venting of hydrothermal fluids substantially altered the porewater geochemistry by enriching it with silica, iron and dissolved inorganic carbon, resulting in island-like habitats with distinct biogeochemistry. The magnitude of fluid flow and difference in sediment grain size, which impedes mixing of the fluids with seawater, were correlated with the observed differences in the porewater geochemistry between the two sites. Concomitantly, individual sites harbored microbial communities with a significantly different community structure. These differences could be statistically linked to variations in the porewater geochemistry and the hydrothermal fluids. The two shallow-water hydrothermal systems of Dominica harbored bacterial communities with high taxonomical and metabolic diversity, predominated by heterotrophic microorganisms associated with the Gammaproteobacterial genera Pseudomonas and Pseudoalteromonas, indicating the importance of heterotrophic processes. Overall, this study shows that shallow-water hydrothermal systems contribute substantially to the biogeochemical heterogeneity and bacterial diversity of coastal sediments.
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影响因子：
3
作者：
Gomez-Saez, Gonzalo V.;Riedel, Thomas;Buehring, Solveig I.
通讯作者：
Buehring, Solveig I.
DOI：
10.1128/genomea.00253-17
发表时间：
2017-04-27
期刊：
Genome announcements
影响因子：
--
作者：
Chen C;Sun L
通讯作者：
Sun L
DOI：
10.1099/ijs.0.64639-0
发表时间：
2007-02-01
影响因子：
2.8
作者：
Crapart, Sylvaine;Fardeau, Marie-Laure;Combet-Blanc, Yannick
通讯作者：
Combet-Blanc, Yannick
影响因子：
3.7
作者：
Farag IF;Davis JP;Youssef NH;Elshahed MS
通讯作者：
Elshahed MS
蛋白杆菌的一种新型谱系参与了海洋富氧化微生物垫群落的形成。
影响因子：
3.7
作者：
Emerson, David;Rentz, Jeremy A.;Lilburn, Timothy G.;Davis, Richard E.;Aldrich, Henry;Chan, Clara;Moyer, Craig L.
通讯作者：
Moyer, Craig L.