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Biomarker indicators for anaerobic oxidizers of methane in brackish-marine sediments with diffusive methane fluxes

Biomarker indicators for anaerobic oxidizers of methane in brackish-marine sediments with diffusive methane fluxes
Biomarker indicators for anaerobic oxidizers of methane in brackish-marine sediments with diffusive methane fluxes
The anaerobic oxidation of methane (AOM) is a major methane sink in marine sediments and plays a crucial role in mitigating methane fluxes to the overlying water column. We investigated biomarker distributions and compound specific isotopic signatures in sediments from sites on the Northern European continental margin that are characterized by a diffusive flux of methane. At all sites, the organic matter (OM) is predominantly derived from terrestrial higher plants, with subordinate abundances of algal biomarkers, but biomarkers for archaea and bacteria are also present. The co-occurrence of the archaeal lipids archaeol, sn-2-hydroxyarchaeol and 2,6,10,15,19-pentamethylicosane (PMI) with non-isoprenoid diethers inferred to derive from sulfate-reducing bacteria (SRB) is similar to microbial biomarker assemblages observed at cold seeps. The archaeal and inferred SRB biomarker concentrations typically reach maxima close to the sulfate-methane transition zone (SMTZ), where archaeal biomarkers are depleted in 13C. The 16S rRNA gene sequences from the SMTZ of the Aarhus Bay sediment core indicate the occurrence of ANME-1 archaea, consistent with inferences derived from biomarker distributions. These observations suggest that AOM in these diffusive settings is mediated by consortia of archaea and bacteria similar to those found at many seep and methane hydrate sites around the world.
AOM, biomarker, archaeol, hydroxyarchaeol, ANME, sulfate reduction, compound-specific stable carbon isotope analysis, diffusive methane, ocean margin sediments
0146-6380
414-426
Aquilina, A.
656a0e1e-449c-4f74-bd56-cbe6121fd4b3
Knab, N.J.
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Knittel, K.
6296205e-062e-424a-beb2-bdb8aabd1008
Kaur, G.
3530f7a0-2fa2-41b2-a616-524675828156
Geissler, A.
746affe1-7c5e-4b83-ab9b-29fb7be95e2d
Kelly, S.P.
7f5b9af5-b809-4a21-bd63-2f86f657a348
Fossing, H.
234a62e3-febb-4834-b3a6-2aa2fd76e4b9
Boot, C.
db8dcef2-4be2-4096-9b9a-315c6fec1dd8
Parkes, R.J.
f363de58-5ef8-43ee-bd2d-a665fb3a2851
Mills, R.A.
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Boetius, A.
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Lloyd, J.
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Pancost, R.
83fce1f4-0cfe-4c2b-aa67-8a4cfd27d762
Aquilina, A.
656a0e1e-449c-4f74-bd56-cbe6121fd4b3
Knab, N.J.
1e8f61fb-d970-42c0-b927-12c1f177de4d
Knittel, K.
6296205e-062e-424a-beb2-bdb8aabd1008
Kaur, G.
3530f7a0-2fa2-41b2-a616-524675828156
Geissler, A.
746affe1-7c5e-4b83-ab9b-29fb7be95e2d
Kelly, S.P.
7f5b9af5-b809-4a21-bd63-2f86f657a348
Fossing, H.
234a62e3-febb-4834-b3a6-2aa2fd76e4b9
Boot, C.
db8dcef2-4be2-4096-9b9a-315c6fec1dd8
Parkes, R.J.
f363de58-5ef8-43ee-bd2d-a665fb3a2851
Mills, R.A.
a664f299-1a34-4b63-9988-1e599b756706
Boetius, A.
87e266e8-a5f5-44ae-9a24-21b9a872fb45
Lloyd, J.
9e93814a-879b-4b3d-9e71-73429412bf69
Pancost, R.
83fce1f4-0cfe-4c2b-aa67-8a4cfd27d762

Aquilina, A., Knab, N.J., Knittel, K., Kaur, G., Geissler, A., Kelly, S.P., Fossing, H., Boot, C., Parkes, R.J., Mills, R.A., Boetius, A., Lloyd, J. and Pancost, R. (2010) Biomarker indicators for anaerobic oxidizers of methane in brackish-marine sediments with diffusive methane fluxes. Organic Geochemistry, 41 (4), 414-426. (doi:10.1016/j.orggeochem.2009.09.009).

Record type: Article

Abstract

The anaerobic oxidation of methane (AOM) is a major methane sink in marine sediments and plays a crucial role in mitigating methane fluxes to the overlying water column. We investigated biomarker distributions and compound specific isotopic signatures in sediments from sites on the Northern European continental margin that are characterized by a diffusive flux of methane. At all sites, the organic matter (OM) is predominantly derived from terrestrial higher plants, with subordinate abundances of algal biomarkers, but biomarkers for archaea and bacteria are also present. The co-occurrence of the archaeal lipids archaeol, sn-2-hydroxyarchaeol and 2,6,10,15,19-pentamethylicosane (PMI) with non-isoprenoid diethers inferred to derive from sulfate-reducing bacteria (SRB) is similar to microbial biomarker assemblages observed at cold seeps. The archaeal and inferred SRB biomarker concentrations typically reach maxima close to the sulfate-methane transition zone (SMTZ), where archaeal biomarkers are depleted in 13C. The 16S rRNA gene sequences from the SMTZ of the Aarhus Bay sediment core indicate the occurrence of ANME-1 archaea, consistent with inferences derived from biomarker distributions. These observations suggest that AOM in these diffusive settings is mediated by consortia of archaea and bacteria similar to those found at many seep and methane hydrate sites around the world.

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More information

Published date: April 2010
Keywords: AOM, biomarker, archaeol, hydroxyarchaeol, ANME, sulfate reduction, compound-specific stable carbon isotope analysis, diffusive methane, ocean margin sediments

Identifiers

Local EPrints ID: 79489
URI: https://eprints.soton.ac.uk/id/eprint/79489
ISSN: 0146-6380
PURE UUID: d9012dc5-f899-4815-bb99-3fbe3ddb2d81
ORCID for R.A. Mills: ORCID iD orcid.org/0000-0002-9811-246X

Catalogue record

Date deposited: 16 Mar 2010
Last modified: 06 Jun 2018 13:07

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Contributors

Author: A. Aquilina
Author: N.J. Knab
Author: K. Knittel
Author: G. Kaur
Author: A. Geissler
Author: S.P. Kelly
Author: H. Fossing
Author: C. Boot
Author: R.J. Parkes
Author: R.A. Mills ORCID iD
Author: A. Boetius
Author: J. Lloyd
Author: R. Pancost

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