Diversity, stratification and in situ metabolism of anaerobic methanotrophic archaea in Nyegga cold seeps

TL;DRAbstract

Anaerobic methanotrophic Archaea (ANME) have considerable importance in a global environmental context as they are considered the major biological sink for methane due to their ubiquitous distribution in anaerobic methaneenriched sediments world-wide. Together with a sulfate-reducing partner, ANME perform anaerobic oxidation of methane (AOM) coupled to sulfate reduction. Knowledge about the syntrophic lifestyle, adaptations to varying geochemical conditions and the biochemistry of these uncultivated archaea is limited. In this study, the microbial communities were sampled from sediment cores that were retrieved from two locations at the Nyegga cold seep area. The cores were sampled inside the G11 pockmark and at the CN03 area, which are characterized by differences in the methane fluid flux. The parallel pyrosequencing of 16S rRNA gene amplicons provided taxonomic information with high resolution for analyses of the microbial communities. New information about the vertical transition o

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