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Article: Lipid and carbon isotopic evidence of methane-oxidizing and sulfate-reducing bacteria in association with gas hydrates from the Gulf of Mexico

TitleLipid and carbon isotopic evidence of methane-oxidizing and sulfate-reducing bacteria in association with gas hydrates from the Gulf of Mexico
Authors
KeywordsAnaerobic Methane Oxidation
Carbon Isotopes
Gas Hydrates
Gulf Of Mexico
Lipid Biomarkers
Sulfate-Reducing Bacteria
Issue Date2002
PublisherGeological Society of America. The Journal's web site is located at http://www.geosociety.org/pubs/
Citation
Geology, 2002, v. 30 n. 3, p. 239-242 How to Cite?
AbstractAn integrated lipid biomarker-carbon isotope approach reveals new insight to microbial methane oxidation in the Gulf of Mexico gas-hydrate system. Hydrate-bearing and hydrate-free sediments were collected from the Gulf of Mexico slope using a research submersible. Phospholipid fatty acids consist mainly of C16-C18 compounds, which are largely derived from bacteria. The phospholipid fatty acids suggest that total biomass is enhanced 11-30-fold in gas-hydrate-bearing sediment compared to hydrate-free sediment. Lipid biomarkers indicative of sulfate-reducing bacteria are strongly depleted in 13C (δ13C = -48‰ to -70‰) in the hydrate-bearing samples, suggesting that they are involved in the oxidation of methane (δ13C = -47‰ for thermogenic methane and -70‰ for biogenic methane). Isotopic properties of other biomarkers suggest that sulfur-oxidizing bacteria (Beggiatoa) may also contribute to the lipid pool in hydrate-bearing samples, which are characterized by less negative δ13C values (to -11.2‰). In the hydrate-free sample, fatty acid biomarkers have δ13C values of -27.6‰ to -39.6‰, indicating that crude oil (average ~-27‰) or terrestrial organic carbon (average ~-20‰) are the likely carbon sources. Our results provide the first lipid biomarker-stable isotope evidence that sulfate-reducing bacteria play an important role in anaerobic methane oxidation in the Gulf of Mexico gas hydrates. The coupled activities of methane-oxidizing and sulfate-reducing organisms contribute to the development of ecosystems in deep-sea environments and result in sequestration of carbon as buried organic carbon and authigenic carbonates. These have implications for studying climate change based on carbon budgets.
Persistent Identifierhttp://hdl.handle.net/10722/151084
ISSN
2015 Impact Factor: 4.548
2015 SCImago Journal Rankings: 3.278
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, CLen_US
dc.contributor.authorLi, Yen_US
dc.contributor.authorWall, JDen_US
dc.contributor.authorLarsen, Len_US
dc.contributor.authorSassen, Ren_US
dc.contributor.authorHuang, Yen_US
dc.contributor.authorWang, Yen_US
dc.contributor.authorPeacock, Aen_US
dc.contributor.authorWhite, DCen_US
dc.contributor.authorHorita, Jen_US
dc.contributor.authorCole, DRen_US
dc.date.accessioned2012-06-26T06:16:55Z-
dc.date.available2012-06-26T06:16:55Z-
dc.date.issued2002en_US
dc.identifier.citationGeology, 2002, v. 30 n. 3, p. 239-242en_US
dc.identifier.issn0091-7613en_US
dc.identifier.urihttp://hdl.handle.net/10722/151084-
dc.description.abstractAn integrated lipid biomarker-carbon isotope approach reveals new insight to microbial methane oxidation in the Gulf of Mexico gas-hydrate system. Hydrate-bearing and hydrate-free sediments were collected from the Gulf of Mexico slope using a research submersible. Phospholipid fatty acids consist mainly of C16-C18 compounds, which are largely derived from bacteria. The phospholipid fatty acids suggest that total biomass is enhanced 11-30-fold in gas-hydrate-bearing sediment compared to hydrate-free sediment. Lipid biomarkers indicative of sulfate-reducing bacteria are strongly depleted in 13C (δ13C = -48‰ to -70‰) in the hydrate-bearing samples, suggesting that they are involved in the oxidation of methane (δ13C = -47‰ for thermogenic methane and -70‰ for biogenic methane). Isotopic properties of other biomarkers suggest that sulfur-oxidizing bacteria (Beggiatoa) may also contribute to the lipid pool in hydrate-bearing samples, which are characterized by less negative δ13C values (to -11.2‰). In the hydrate-free sample, fatty acid biomarkers have δ13C values of -27.6‰ to -39.6‰, indicating that crude oil (average ~-27‰) or terrestrial organic carbon (average ~-20‰) are the likely carbon sources. Our results provide the first lipid biomarker-stable isotope evidence that sulfate-reducing bacteria play an important role in anaerobic methane oxidation in the Gulf of Mexico gas hydrates. The coupled activities of methane-oxidizing and sulfate-reducing organisms contribute to the development of ecosystems in deep-sea environments and result in sequestration of carbon as buried organic carbon and authigenic carbonates. These have implications for studying climate change based on carbon budgets.en_US
dc.languageengen_US
dc.publisherGeological Society of America. The Journal's web site is located at http://www.geosociety.org/pubs/en_US
dc.relation.ispartofGeologyen_US
dc.subjectAnaerobic Methane Oxidationen_US
dc.subjectCarbon Isotopesen_US
dc.subjectGas Hydratesen_US
dc.subjectGulf Of Mexicoen_US
dc.subjectLipid Biomarkersen_US
dc.subjectSulfate-Reducing Bacteriaen_US
dc.titleLipid and carbon isotopic evidence of methane-oxidizing and sulfate-reducing bacteria in association with gas hydrates from the Gulf of Mexicoen_US
dc.typeArticleen_US
dc.identifier.emailLi, Y:yiliang@hkucc.hku.hken_US
dc.identifier.authorityLi, Y=rp01354en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-84874967616en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036490628&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume30en_US
dc.identifier.issue3en_US
dc.identifier.spage239en_US
dc.identifier.epage242en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridZhang, CL=7405489900en_US
dc.identifier.scopusauthoridLi, Y=27171876700en_US
dc.identifier.scopusauthoridWall, JD=7201351982en_US
dc.identifier.scopusauthoridLarsen, L=36781591600en_US
dc.identifier.scopusauthoridSassen, R=7005455629en_US
dc.identifier.scopusauthoridHuang, Y=7501574588en_US
dc.identifier.scopusauthoridWang, Y=7601518662en_US
dc.identifier.scopusauthoridPeacock, A=7103229369en_US
dc.identifier.scopusauthoridWhite, DC=7404818602en_US
dc.identifier.scopusauthoridHorita, J=7004513273en_US
dc.identifier.scopusauthoridCole, DR=7402514711en_US

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