Bacterial community structure and novel species of magnetotactic bacteria in sediments from a seamount in the Mariana volcanic arc.
Bacterial community structure and novel species of magnetotactic bacteria in sediments from a seamount in the Mariana volcanic arc.
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马里亚纳火山弧海山沉积物中的细菌群落结构和新的趋磁细菌物种。
DOI：
10.1038/s41598-017-17445-4
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发表时间：
2017-12-21
影响因子：
4.6
通讯作者：
Wu LF
中科院分区：
文献类型：
--
作者：
Liu J;Zhang W;Li X;Li X;Chen X;Li JH;Teng Z;Xu C;Santini CL;Zhao L;Zhao Y;Zhang H;Zhang WJ;Xu K;Li C;Pan Y;Xiao T;Pan H;Wu LF
海山是从海底突然升起的海底山脉，与水下水流动态地相互作用。它们代表了具有各种微生物群落结构的独特生物栖息地。某些海山细菌形成明显的细胞外氧化铁结构，包括结壳柄、扁平分叉管和丝状鞘。为了扩大我们的海山生态系统的知识，我们进行了综合研究的人口结构和发生的趋磁细菌（MTB）合成细胞内氧化铁纳米晶体的沉积物中的马里亚纳火山弧的海山。我们发现变形菌占主导地位的14个站中的13个，但排名第二丰富的厚壁菌门的成员在深水站位于一个陡峭的斜坡上面临的马里亚纳-雅浦海沟。活的山地车栖息在所有14个站点的生物沉积物中，深度从238米到2，023米不等。一些趋磁球菌拥有最复杂的鞭毛机构尚未报道; 19鞭毛排列在一个3：4：5：4：3阵列内的鞭毛束。系统发育分析的16 S rRNA基因序列确定了16个新的物种的结核分枝杆菌特有的这座海山。总之，获得的结果表明，海山站的地理特性是重要的塑造细菌群落结构和结核分枝杆菌的组成。
Seamounts are undersea mountains rising abruptly from the sea floor and interacting dynamically with underwater currents. They represent unique biological habitats with various microbial community structures. Certain seamount bacteria form conspicuous extracellular iron oxide structures, including encrusted stalks, flattened bifurcating tubes, and filamentous sheaths. To extend our knowledge of seamount ecosystems, we performed an integrated study on population structure and the occurrence of magnetotactic bacteria (MTB) that synthesize intracellular iron oxide nanocrystals in sediments of a seamount in the Mariana volcanic arc. We found Proteobacteria dominant at 13 of 14 stations, but ranked second in abundance to members of the phylum Firmicutes at the deep-water station located on a steep slope facing the Mariana-Yap Trench. Live MTB dwell in biogenic sediments from all 14 stations ranging in depth from 238 to 2,023 m. Some magnetotactic cocci possess the most complex flagellar apparatus yet reported; 19 flagella are arranged in a 3:4:5:4:3 array within a flagellar bundle. Phylogenetic analysis of 16S rRNA gene sequences identified 16 novel species of MTB specific to this seamount. Together the results obtained indicate that geographic properties of the seamount stations are important in shaping the bacterial community structure and the MTB composition.
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