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dc.contributor.authorLiebner, Susanne
dc.contributor.authorGanzert, Lars
dc.contributor.authorKiss, Andrea
dc.contributor.authorYang, Sizhong
dc.contributor.authorWagner, Dirk
dc.contributor.authorSvenning, Mette Marianne
dc.date.accessioned2016-03-08T13:00:20Z
dc.date.available2016-03-08T13:00:20Z
dc.date.issued2015-05-12
dc.description.abstractThe response of methanogens to thawing permafrost is an important factor for the global greenhouse gas budget. We tracked methanogenic community structure, activity, and abundance along the degradation of sub-Arctic palsa peatland permafrost. We observed the development of pronounced methane production, release, and abundance of functional (mcrA) methanogenic gene numbers following the transitions from permafrost (palsa) to thaw pond structures. This was associated with the establishment of a methanogenic community consisting both of hydrogenotrophic (Methanobacterium, Methanocellales), and potential acetoclastic (Methanosarcina) members and their activity. While peat bog development was not reflected in significant changes of mcrA copy numbers, potential methane production, and rates of methane release decreased. This was primarily linked to a decline of potential acetoclastic in favor of hydrogenotrophic methanogens. Although palsa peatland succession offers similarities with typical transitions from fen to bog ecosystems, the observed dynamics in methane fluxes and methanogenic communities are primarily attributed to changes within the dominant Bryophyta and Cyperaceae taxa rather than to changes in peat moss and sedge coverage, pH and nutrient regime. Overall, the palsa peatland methanogenic community was characterized by a few dominant operational taxonomic units (OTUs). These OTUs seem to be indicative for methanogenic species that thrive in terrestrial organic rich environments. In summary, our study shows that after an initial stage of high methane emissions following permafrost thaw, methane fluxes, and methanogenic communities establish that are typical for northern peat bogs.en_US
dc.descriptionPublished version. Also available at <a href= http://dx.doi.org/10.3389/fmicb.2015.00356> http://dx.doi.org/10.3389/fmicb.2015.00356</a>en_US
dc.identifier.citationFrontiers in Microbiology 2015, 6:356en_US
dc.identifier.cristinIDFRIDAID 1306403
dc.identifier.doi10.3389/fmicb.2015.00356
dc.identifier.issn1664-302X
dc.identifier.urihttps://hdl.handle.net/10037/8769
dc.identifier.urnURN:NBN:no-uit_munin_8340
dc.language.isoengen_US
dc.publisherFrontiersen_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.subjectdiscontinuous permafrosten_US
dc.subjectpalsaen_US
dc.subjectmethaneen_US
dc.subjectmethanogensen_US
dc.subjectmcrAen_US
dc.subjectpeatland successionen_US
dc.subjectclimate changeen_US
dc.titleShifts in methanogenic community composition and methane fluxes along the degradation of discontinuous permafrosten_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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