NATURAL-ABUNDANCE RADIOCARBON AS A TRACER OF ASSIMILATION OF PETROLEUM CARBON BY BACTERIA IN SALT MARSH SEDIMENTS
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dc.contributor.author | Wakeham S.G. | |
dc.contributor.author | McNichol A.P. | |
dc.contributor.author | Kostka J.E. | |
dc.contributor.author | Pease T.K. | |
dc.date.accessioned | 2024-09-03T09:56:24Z | |
dc.date.available | 2024-09-03T09:56:24Z | |
dc.date.issued | 2006 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=31327766 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2006, 70, 7, 1761-1771 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/44866 | |
dc.description.abstract | The natural abundance of radiocarbon (14C) provides unique insight into the source and cycling of sedimentary organic matter. Radiocarbon analysis of bacterial phospholipid lipid fatty acids (PLFAs) in salt-marsh sediments of southeast Georgia (USA)-one heavily contaminated by petroleum residues-was used to assess the fate of petroleum-derived carbon in sediments and incorporation of fossil carbon into microbial biomass. PLFAs that are common components of eubacterial cell membranes (e.g., branched C15 and C17, 10-methyl-C16) were depleted in 14C in the contaminated sediment (mean Δ14C value of +25 ± 19% for bacterial PLFAs) relative to PLFAs in uncontaminated "control" sediment (Δ14C = +101 ± 12%). We suggest that the 14C-depletion in bacterial PLFAs at the contaminated site results from microbial metabolism of petroleum and subsequent incorporation of petroleum-derived carbon into bacterial membrane lipids. A mass balance calculation indicates that 6-10% of the carbon in bacterial PLFAs at the oiled site could derive from petroleum residues. These results demonstrate that even weathered petroleum may contain components of sufficient lability to be a carbon source for biomass production by marsh sediment microorganisms. Furthermore, a small but significant fraction of fossil carbon is assimilated even in the presence of a much larger pool of presumably more-labile and faster-cycling carbon substrates. © 2006 Elsevier Inc. All rights reserved. | |
dc.title | NATURAL-ABUNDANCE RADIOCARBON AS A TRACER OF ASSIMILATION OF PETROLEUM CARBON BY BACTERIA IN SALT MARSH SEDIMENTS | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/j.gca.2005.12.020 |
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