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dc.contributor.authorTveit, Alexander Tøsdal
dc.contributor.authorUrich, Tim
dc.contributor.authorFrenzel, Peter
dc.contributor.authorSvenning, Mette Marianne
dc.date.accessioned2015-05-22T11:33:08Z
dc.date.available2015-05-22T11:33:08Z
dc.date.issued2015-04-27
dc.description.abstractArctic permafrost soils store large amounts of soil organic carbon (SOC) that could be released into the atmosphere as methane (CH4) in a future warmer climate. How warming affects the complex microbial network decomposing SOC is not understood. We studied CH4 production of Arctic peat soil microbiota in anoxic microcosms over a temperature gradient from 1 to 30 °C, combining metatranscriptomic, metagenomic, and targeted metabolic profiling. The CH4 production rate at 4 °C was 25% of that at 25 °C and increased rapidly with temperature, driven by fast adaptations of microbial community structure, metabolic network of SOC decomposition, and trophic interactions. Below 7 °C, syntrophic propionate oxidation was the rate-limiting step for CH4 production; above this threshold temperature, polysaccharide hydrolysis became rate limiting. This change was associated with a shift within the functional guild for syntrophic propionate oxidation, with Firmicutes being replaced by Bacteroidetes. Correspondingly, there was a shift from the formate- and H2-using Methanobacteriales to Methanomicrobiales and from the acetotrophic Methanosarcinaceae to Methanosaetaceae. Methanogenesis from methylamines, probably stemming from degradation of bacterial cells, became more important with increasing temperature and corresponded with an increased relative abundance of predatory protists of the phylum Cercozoa. We concluded that Arctic peat microbiota responds rapidly to increased temperatures by modulating metabolic and trophic interactions so that CH4 is always highly produced: The microbial community adapts through taxonomic shifts, and cascade effects of substrate availability cause replacement of functional guilds and functional changes within taxa.en_US
dc.identifier.citationPNAS E2507–E2516 (2015)en_US
dc.identifier.issn0027-8424
dc.identifier.otherFRIDAID 1242275
dc.identifier.other10.1073/pnas.1420797112
dc.identifier.urihttps://hdl.handle.net/10037/7689
dc.identifier.urnURN:NBN:no-uit_munin_7279
dc.language.isoengen_US
dc.publisherNational Academy of Sciences of the USAen_US
dc.rights.accessRightsopenAccess
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Basale biofag: 470::Generell mikrobiologi: 472en_US
dc.subjectVDP::Mathematics and natural science: 400::Basic biosciences: 470::General microbiology: 472en_US
dc.titleMetabolic and trophic interactions modulate methane production in response to warmingen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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