Biological methane production and accumulation under sulfate-rich conditions at Cape Lookout Bight, NC

Coon, Gage R.; Duesing, Paul D.; Paul, Raegan; Baily, Jennifer A.; Lloyd, Karen G.

doi:10.3389/fmicb.2023.1268361

Biological methane production and accumulation under sulfate-rich conditions at Cape Lookout Bight, NC

Journal Article · Fri Oct 06 00:00:00 EDT 2023 · Frontiers in Microbiology

DOI:https://doi.org/10.3389/fmicb.2023.1268361· OSTI ID:2472328

Coon, Gage R. ^[1]; Duesing, Paul D. ^[2]; Paul, Raegan ^[2]; Baily, Jennifer A. ^[2]; Lloyd, Karen G. ^[2]

Univ. of Tennessee, Knoxville, TN (United States); OSTI
Univ. of Tennessee, Knoxville, TN (United States)

Introduction: Anaerobic oxidation of methane (AOM) is hypothesized to occur through reverse hydrogenotrophic methanogenesis in marine sediments because sulfate reducers pull hydrogen concentrations so low that reverse hydrogenotrophic methanogenesis is exergonic. If true, hydrogenotrophic methanogenesis can theoretically co-occur with sulfate reduction if the organic matter is so labile that fermenters produce more hydrogen than sulfate reducers can consume, causing hydrogen concentrations to rise. Finding accumulation of biologically-produced methane in sulfate-containing organic-rich sediments would therefore support the theory that AOM occurs through reverse hydrogenotrophic methanogenesis since it would signal the absence of net AOM in the presence of sulfate. Methods: 16S rRNA gene libraries were compared to geochemistry and incubations in high depth-resolution sediment cores collected from organic-rich Cape Lookout Bight, North Carolina. Results: We found that methane began to accumulate while sulfate is still abundant (6–8 mM). Methane-cycling archaea ANME-1, Methanosarciniales, and Methanomicrobiales also increased at these depths. Incubations showed that methane production in the upper 16 cm in sulfate-rich sediments was biotic since it could be inhibited by 2-bromoethanosulfonoic acid (BES). Discussion: We conclude that methanogens mediate biological methane production in these organic-rich sediments at sulfate concentrations that inhibit methanogenesis in sediments with less labile organic matter, and that methane accumulation and growth of methanogens can occur under these conditions as well. Our data supports the theory that H2 concentrations, rather than the cooccurrence of sulfate and methane, control whether methanogenesis or AOM via reverse hydrogenotrophic methanogenesis occurs. We hypothesize that the high amount of labile organic matter at this site prevents AOM, allowing methane accumulation when sulfate is low but still present in mM concentrations

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)

Grant/Contract Number:: SC0020369

OSTI ID:: 2472328

Journal Information:: Frontiers in Microbiology, Journal Name: Frontiers in Microbiology Vol. 14; ISSN 1664-302X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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Biological methane production and accumulation under sulfate-rich conditions at Cape Lookout Bight, NC

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