气候变化领域集成服务门户(CCPortal): Seawater recirculation through subducting sediments sustains a deeply buried population of sulfate-reducing bacteria

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DOI	10.1111/gbi.12324
	Seawater recirculation through subducting sediments sustains a deeply buried population of sulfate-reducing bacteria
	Cox T.L.; Gan H.M.; Moreau J.W.
发表日期	2019
ISSN	14724677
起始页码	172
结束页码	184
卷号	17 期号:2
英文摘要	Subseafloor sulfate concentrations typically decrease with depth as this electron acceptor is consumed by respiring microorganisms. However, studies show that seawater can flow through hydraulically conductive basalt to deliver sulfate upwards into deeply buried overlying sediments. Our previous work on IODP Site C0012A (Nankai Trough, Japan) revealed that recirculation of sulfate through the subducting Philippine Sea Plate stimulated microbial activity near the sediment–basement interface (SBI). Here, we describe the microbial ecology, phylogeny, and energetic requirements of population of aero-tolerant sulfate-reducing bacteria in the deep subseafloor. We identified dissimilatory sulfite reductase gene (dsr) sequences 93% related to oxygen-tolerant Desulfovibrionales species across all reaction zones while no SRB were detected in drilling fluid control samples. Pore fluid chemistry revealed low concentrations of methane (<0.25 mM), while hydrogen levels were consistent with active bacterial sulfate reduction (0.51–1.52 nM). Solid phase total organic carbon (TOC) was also considerably low in these subseafloor sediments. Our results reveal the phylogenetic diversity, potential function, and physiological tolerance of a community of sulfate-reducing bacteria living at ~480 m below subducting seafloor. © 2018 John Wiley & Sons Ltd
关键词	basalt biogeochemistry concentration (composition)drilling fluid enzyme enzyme activity hydraulic conductivity methane microbial activity seafloor seawater sediment chemistry sediment-water interface species diversity sulfate-reducing bacterium total organic carbon Nankai Trough Pacific Ocean Philippine Sea Bacteria (microorganisms)Desulfovibrionales sea water sulfate bacterium classification metabolism microbiology oxidation reduction reaction Pacific Ocean phylogeny sediment sequence analysis Bacteria Geologic Sediments Oxidation-Reduction Pacific Ocean Phylogeny Seawater Sequence Analysis, Protein Sulfates
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133238
推荐引用方式 GB/T 7714	Cox T.L.,Gan H.M.,Moreau J.W.. Seawater recirculation through subducting sediments sustains a deeply buried population of sulfate-reducing bacteria[J]. Geobiology,2019,17(2).
APA	Cox T.L.,Gan H.M.,&Moreau J.W..(2019).Seawater recirculation through subducting sediments sustains a deeply buried population of sulfate-reducing bacteria.,17(2).
MLA	Cox T.L.,et al."Seawater recirculation through subducting sediments sustains a deeply buried population of sulfate-reducing bacteria".17.2(2019).