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Discovery of a novel methanogen prevalent in thawing permafrost
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0002-5574-5531
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2014 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 5, 3212Article in journal (Refereed) Published
Abstract [en]

Thawing permafrost promotes microbial degradation of cryo-sequestered and new carbon leading to the biogenic production of methane, creating a positive feedback to climate change. Here we determine microbial community composition along a permafrost thaw gradient in northern Sweden. Partially thawed sites were frequently dominated by a single archaeal phylotype, Candidatus ‘Methanoflorens stordalenmirensis’ gen. nov. sp. nov., belonging to the uncultivated lineage ‘Rice Cluster II’ (Candidatus ‘Methanoflorentaceae’ fam. nov.). Metagenomic sequencing led to the recovery of its near-complete genome, revealing the genes necessary for hydrogenotrophic methanogenesis. These genes are highly expressed and methane carbon isotope data are consistent with hydrogenotrophic production of methane in the partially thawed site. In addition to permafrost wetlands, ‘Methanoflorentaceae’ are widespread in high methane-flux habitats suggesting that this lineage is both prevalent and a major contributor to global methane production. In thawing permafrost, Candidatus ‘M. stordalenmirensis’ appears to be a key mediator of methane-based positive feedback to climate warming.

Place, publisher, year, edition, pages
2014. Vol. 5, 3212
Keyword [en]
permafrost, climate research, biogeochemistry, microbiology, methane, methanogens, peat lands
National Category
Climate Research Microbiology Geochemistry
Research subject
URN: urn:nbn:se:uu:diva-219073DOI: 10.1038/ncomms4212OAI: oai:DiVA.org:uu-219073DiVA: diva2:698238
Available from: 2014-02-20 Created: 2014-02-20 Last updated: 2016-08-12Bibliographically approved

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Publisher's full texthttp://www.nature.com/ncomms/2014/140214/ncomms4212/full/ncomms4212.html

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