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• W2000697954 abstract "The anaerobic oxidation of methane (AOM) with sulphate is the most important sink for methane in marine environments. This process is mediated by a consortium of methanotrophic archaea and sulphate reducing bacteria. So far, three groups of anaerobic methane oxidisers (ANME-1, -2 and -3) related to the methanogenic Methanosarcinales and Methanomicrobiales were discovered. The sulphate reducing partner of ANME-1 and -2 are two different eco-types of SRB related to the Desulfosarcina/Desulfococcus cluster (Seep-SRB1), whereas ANME-3 is associated with Desulfobulbus spp. (DBB). In this article, we reviewed literature data to assign statistically significant lipid biomarker signatures for a chemotaxonomic identification of the three known AOM communities. The lipid signatures of ANME-2/Seep-SRB1 and ANME-3/DBB are intriguingly similar, whereas ANME-1/Seep-SRB1 shows substantial differences to these AOM communities. ANME-1 can be distinguished from ANME-2 and -3 by a low ratio of the isoprenoidal dialkyl glycerol diethers sn2-hydroxyarchaeol and archaeol combined with a comparably low stable carbon isotope difference of archaeol relative to the source methane. Furthermore, only ANME-1 contains substantial amounts of isoprenoidal glycerol dialkyl glycerol tetraethers (GDGTs), however, with the probable exception of the ANME-2c sub-cluster. In contrast to the ANME-1 archaea, the tail to tail linked hydrocarbon tetramethylhexadecane (crocetane) is unique to ANME-2, whereas pentamethylicosenes (PMIs) with 4 and 5 double bonds without any higher saturated homologues were only found in ANME-3. The sulphate reducing partner of ANME-1 can be discerned from those of ANME-2 and -3 by a low ratio of the fatty acids (FAs) C16:1ω5 relative to i-C15:0 and, although to a lesser degree, by a high abundance of ai-C15:0 relative to i-C15:0. Furthermore, substantial amounts of 13C depleted non-isoprenoidal monoalkyl glycerol ethers (MAGEs) were only found in the sulphate reducing partners of ANME-2 and -3. A differentiation of these SRB is possible based on the characteristic presence of the FAs cy-C17:0ω5,6 and C17:1ω6, respectively. Generally, the data analysed here show overlaps between the different AOM communities, which highlights the need to use multiple lipid signatures for a robust identification of the dominating microbes involved." @default.
• W2000697954 created "2016-06-24" @default.
• W2000697954 creator A5016153205 @default.
• W2000697954 creator A5075104775 @default.
• W2000697954 date "2008-12-01" @default.
• W2000697954 modified "2023-10-08" @default.
• W2000697954 title "Diagnostic lipid biomarker and stable carbon isotope signatures of microbial communities mediating the anaerobic oxidation of methane with sulphate" @default.
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• W2000697954 doi "https://doi.org/10.1016/j.orggeochem.2007.11.003" @default.
• W2000697954 hasPublicationYear "2008" @default.
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