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      Microbial Sulfate Reduction Potential in Coal-Bearing Sediments Down to ~2.5 km below the Seafloor off Shimokita Peninsula, Japan

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          Abstract

          Sulfate reduction is the predominant anaerobic microbial process of organic matter mineralization in marine sediments, with recent studies revealing that sulfate reduction not only occurs in sulfate-rich sediments, but even extends to deeper, methanogenic sediments at very low background concentrations of sulfate. Using samples retrieved off the Shimokita Peninsula, Japan, during the Integrated Ocean Drilling Program (IODP) Expedition 337, we measured potential sulfate reduction rates by slurry incubations with 35S-labeled sulfate in deep methanogenic sediments between 1276.75 and 2456.75 meters below the seafloor. Potential sulfate reduction rates were generally extremely low (mostly below 0.1 pmol cm −3 d −1) but showed elevated values (up to 1.8 pmol cm −3 d −1) in a coal-bearing interval (Unit III). A measured increase in hydrogenase activity in the coal-bearing horizons coincided with this local increase in potential sulfate reduction rates. This paired enzymatic response suggests that hydrogen is a potentially important electron donor for sulfate reduction in the deep coalbed biosphere. By contrast, no stimulation of sulfate reduction rates was observed in treatments where methane was added as an electron donor. In the deep coalbeds, small amounts of sulfate might be provided by a cryptic sulfur cycle. The isotopically very heavy pyrites (δ 34S = +43‰) found in this horizon is consistent with its formation via microbial sulfate reduction that has been continuously utilizing a small, increasingly 34S-enriched sulfate reservoir over geologic time scales. Although our results do not represent in-situ activity, and the sulfate reducers might only have persisted in a dormant, spore-like state, our findings show that organisms capable of sulfate reduction have survived in deep methanogenic sediments over more than 20 Ma. This highlights the ability of sulfate-reducers to persist over geological timespans even in sulfate-depleted environments. Our study moreover represents the deepest evidence of a potential for sulfate reduction in marine sediments to date.

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          Most cited references86

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          Early oxidation of organic matter in pelagic sediments of the eastern equatorial Atlantic: suboxic diagenesis

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            Sedimentary pyrite formation: An update

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              Sedimentary pyrite formation

              R. Berner (1970)
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                Author and article information

                Contributors
                Journal
                Front Microbiol
                Front Microbiol
                Front. Microbiol.
                Frontiers in Microbiology
                Frontiers Media S.A.
                1664-302X
                05 October 2016
                2016
                : 7
                Affiliations
                [1] 1Department of Biosciences, Center for Geomicrobiology, Aarhus University Aarhus, Denmark
                [2] 2MARUM Center for Marine Environmental Sciences, University of Bremen Bremen, Germany
                [3] 3Boone Pickens School of Geology, Oklahoma State University Stillwater, OK, USA
                [4] 4Department of Earth Sciences, Indiana University-Purdue University Indianapolis Indianapolis, IN, USA
                [5] 5Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology Kochi, Japan
                [6] 6Research and Development Center for Ocean Drilling Science, Japan Agency for Marine-Earth Science and Technology Yokohama, Japan
                [7] 7Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology Yokosuka, Japan
                Author notes

                Edited by: Jan Amend, University of Southern California, USA

                Reviewed by: William D. Orsi, Lüdwig-Maximilians University of Munich, Germany; Aude Picard, Harvard University, USA

                *Correspondence: Clemens Glombitza clemens.glombitza@ 123456bios.au.dk

                This article was submitted to Extreme Microbiology, a section of the journal Frontiers in Microbiology

                Article
                10.3389/fmicb.2016.01576
                5051215
                25488e9f-bb3f-405a-9342-b7f999f1124d
                Copyright © 2016 Glombitza, Adhikari, Riedinger, Gilhooly, Hinrichs and Inagaki.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                Page count
                Figures: 5, Tables: 1, Equations: 2, References: 98, Pages: 15, Words: 12067
                Funding
                Funded by: Seventh Framework Programme 10.13039/501100004963
                Award ID: 327675
                Award ID: 294200
                Funded by: Consortium for Ocean Leadership 10.13039/100005198
                Funded by: Danmarks Grundforskningsfond 10.13039/501100001732
                Award ID: DNRF104
                Funded by: Deutsche Forschungsgemeinschaft 10.13039/501100001659
                Funded by: Japan Society for the Promotion of Science 10.13039/501100001691
                Award ID: Grant-in-Aid for Science Research- no. 26251041
                Funded by: IODP Germany
                Funded by: JSPS Funding Program for Next Generation World-Leading Researchers
                Award ID: GR102
                Funded by: Strategic Fund for Strengthening Leading-Edge Research and Development
                Categories
                Microbiology
                Original Research

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