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https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02008858
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Iron-based microbial ecosystem on and below the seafloor: a case study of hydrothermal fields of the Southern Mariana Trough
Kato, Shingo
Nakamura, Kentaro
Toki, Tomohiro
Ishibashi, Jun-ichiro
Tsunogai, Urumu
Hirota, Akinori
Ohkuma, Moriya
Yamagishi, Akihiko
deep-sea hydrothermal vent field
shallow sub-seafloor microbial ecosystem,
chemolithoautotrophs
ron-oxidizing bacteria
hermodynamic modeling
Microbial community structures in deep-sea hydrothermal vents fields are constrained by available energy yields provided by inorganic redox reactions, which are in turn controlled by chemical composition of hydrothermal fluids. In the past two decades, geochemical and microbiological studies have been conducted in deep-sea hydrothermal vents at three geographically different areas of the Southern Mariana Trough (SMT). A variety of geochemical data of hydrothermal fluids and an unparalleled microbiological dataset of various samples (i.e., sulfide structures of active vents, iron-rich mats, borehole fluids, and ambient seawater) are available for comparative analyses. Here, we summarize the geochemical and microbiological characteristics in the SMT and assess the relationship between the microbial community structures and the fluid geochemistry in the SMT by thermodynamic modeling. In the high temperature vent fluids, aerobic sulfide-oxidation has the potential to yield large amounts of bioavailable energy in the vent fluids, which is consistent with the detection of species related to sulfide-oxidizing bacteria (such as Thiomicrospira in the Gammaproteobacteria and Sulfurimonas in the Epsilonproteobacteria). Conversely, the bioavailable energy yield from aerobic iron-oxidation reactions in the low-temperature fluids collected from man-made boreholes and several natural vents were comparable to or higher than those from sulfide-oxidation. This is also consistent with the detection of species related to iron-oxidizing bacteria (Mariprofundus in the Zetaproteobacteria) in such low-temperature samples. The results of combination of microbiological, geochemical, and thermodynamic analyses in the SMT provide novel insights into the presence and significance of iron-based microbial ecosystems in deep-sea hydrothermal fields.
論文
http://purl.org/coar/resource_type/c_6501
Frontiers Media
2012-03-15
VoR
http://hdl.handle.net/20.500.12000/37688
1664-302X
Frontiers in microbiology
89
3
none
eng
https://doi.org/10.3389/fmicb.2012.00089
info:doi/10.3389/fmicb.2012.00089
open access
rights:Copyright: © 2012 Kato, Nakamura, Toki, Ishibashi, Tsunogai, Hirota, Ohkuma and Yamagishi. This is an open-access article distributed under the terms of the Creative Commons Attribution Non Commercial License, which permits non-commercial use, distribution, and reproduction in other forums, provided the original authors and source are credited.