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首页> 美国卫生研究院文献>Microbes and Environments >Heterogeneity of Microbial Communities on Deep-Sea Ferromanganese Crusts in the Takuyo-Daigo Seamount
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Heterogeneity of Microbial Communities on Deep-Sea Ferromanganese Crusts in the Takuyo-Daigo Seamount

机译：Takuy​​o-Daigo海山深海铁锰结壳上微生物群落的异质性

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摘要

Rock outcrops of aged deep-sea seamounts are generally covered with Fe and Mn oxides, known as ferromanganese (Fe–Mn) crusts. Although the presence of microorganisms in Fe–Mn crusts has been reported, limited information is currently available on intra- and inter-variations in crust microbial communities. Therefore, we collected several Fe–Mn crusts in bathyal and abyssal zones (water depths of 1,150–5,520 m) in the Takuyo-Daigo Seamount in the northwestern Pacific, and examined microbial communities on the crusts using culture-independent molecular and microscopic analyses. Quantitative PCR showed that microbial cells were abundant (106–108 cells g−1) on Fe–Mn crust surfaces through the water depths. A comparative 16S rRNA gene analysis revealed community differences among Fe–Mn crusts through the water depths, which may have been caused by changes in dissolved oxygen concentrations. Moreover, community differences were observed among positions within each Fe–Mn crust, and potentially depended on the availability of sinking particulate organic matter. Microscopic and elemental analyses of thin Fe–Mn crust sections revealed the accumulation of microbial cells accompanied by the depletion of Mn in valleys of bumpy crust surfaces. Our results suggest that heterogeneous and abundant microbial communities play a role in the biogeochemical cycling of Mn, in addition to C and N, on crusts and contribute to the extremely slow growth of Fe–Mn crusts.
机译：老化的深海海山的岩石露头通常被铁和锰的氧化物覆盖，被称为铁锰（Fe-Mn）结壳。尽管已经报道了铁锰壳中微生物的存在，但是目前关于壳微生物群落内部和内部变异的信息有限。因此，我们在西北太平洋的Takuy​​o-Daigo海山的海底和深海区（水深1,150-5,520 m）中收集了一些Fe-Mn地壳，并使用与培养无关的分子和显微镜分析研究了地壳上的微生物群落。定量PCR显示，在整个水深中，Fe-Mn壳表面微生物细胞丰富（10 6 –10 8 细胞g -1 ） 。一项比较的16S rRNA基因分析揭示了整个水深处Fe-Mn地壳之间的群落差异，这可能是由溶解氧浓度的变化引起的。此外，在每个Fe-Mn壳中的位置之间观察到群落差异，并且可能取决于下沉的颗粒有机物的可用性。薄薄的Fe-Mn壳截面的显微和元素分析显示，在凹凸不平的壳表面谷中，微生物细胞的积累伴随着Mn的消耗。我们的结果表明，异质和丰富的微生物群落除了在地壳上的C和N之外，还对Mn的生物地球化学循环起作用，并有助于Fe-Mn地壳的极慢生长。

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