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dc.contributor.authorKox, MAR
dc.contributor.authorAalto, SL
dc.contributor.authorPenttilä, T
dc.contributor.authorEttwig, KF
dc.contributor.authorJetten, MSM
dc.contributor.authorvan Kessel, MAHJ
dc.date.accessioned2018-05-17T12:31:59Z
dc.date.available2018-05-17T12:31:59Z
dc.date.issued2018
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/6621
dc.description.abstractBiological nitrogen fixation is an important source of bioavailable nitrogen in Sphagnum dominated peatlands. Sphagnum mosses harbor a diverse microbiome including nitrogen-fixing and methane (CH4) oxidizing bacteria. The inhibitory effect of oxygen on microbial nitrogen fixation is documented for many bacteria. However, the role of nitrogen-fixing methanotrophs in nitrogen supply to Sphagnum peat mosses is not well explored. Here, we investigated the role of both oxygen and methane on nitrogen fixation in subarctic Sphagnum peat mosses. Five species of Sphagnum mosses were sampled from two mesotrophic and three oligotrophic sites within the Lakkasuo peatland in Orivesi, central Finland. Mosses were incubated under either ambient or low oxygen conditions in the presence or absence of methane. Stable isotope activity assays revealed considerable nitrogen-fixing and methane-assimilating rates at all sites (1.4 ± 0.2 µmol 15N–N2 g−1 DW day−1 and 12.0 ± 1.1 µmol 13C–CH4 g−1 DW day−1, respectively). Addition of methane did not stimulate incorporation of 15N-nitrogen into biomass, whereas oxygen depletion increased the activity of the nitrogen-fixing community. Analysis of the 16S rRNA genes at the bacterial community level showed a very diverse microbiome that was dominated by Alphaproteobacteria in all sites. Bona fide methane-oxidizing taxa were not very abundant (relative abundance less than 0.1%). Based on our results we conclude that methanotrophs did not contribute significantly to nitrogen fixation in the investigated peatlands.
dc.language.isoenglanti
dc.publisherSpringer Nature
dc.relation.ispartofseriesAMB Express
dc.relation.urihttp://dx.doi.org/10.1186/s13568-018-0607-2
dc.rightsCC BY http://creativecommons.org/licenses/by/4.0/
dc.subjectdiazotrophy
dc.subjectmethane oxidation
dc.subjectoxygen
dc.subjectpeatland
dc.subjectSphagnum moss
dc.subject16S rRNA
dc.subjectamplicon sequencing
dc.titleThe influence of oxygen and methane on nitrogen fixation in subarctic Sphagnum mosses
dc.description.versionpublished version
dc.contributor.departmentYmpäristö- ja biotieteiden laitos / Toiminta
uef.solecris.id54453821en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© Authors
dc.relation.doi10.1186/s13568-018-0607-2
dc.description.reviewstatuspeerReviewed
dc.relation.articlenumber76
dc.relation.issn2191-0855
dc.relation.issue1
dc.relation.volume8
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessOpen access -julkaisukanavassa ilmestynyt julkaisu


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