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dc.contributor.authorGründger, Friederike
dc.contributor.authorProbandt, David
dc.contributor.authorKnittel, Katrin
dc.contributor.authorCarrier, Vincent
dc.contributor.authorKalenitchenko, Dimitri
dc.contributor.authorSilyakova, Anna
dc.contributor.authorSerov, Pavel
dc.contributor.authorFerré, Benedicte
dc.contributor.authorSvenning, Mette Marianne
dc.contributor.authorNiemann, Helge
dc.date.accessioned2021-06-28T06:23:21Z
dc.date.available2021-06-28T06:23:21Z
dc.date.issued2021-04-07
dc.description.abstractThe Arctic Ocean subseabed holds vast reservoirs of the potent greenhouse gas methane (CH<sub>4</sub>), often seeping into the ocean water column. In a continuously warming ocean as a result of climate change an increase of CH<sub>4</sub> seepage from the seabed is hypothesized. Today, CH<sub>4</sub> is largely retained in the water column due to the activity of methane-oxidizing bacteria (MOB) that thrive there. Predicted future oceanographic changes, bottom water warming and increasing CH<sub>4</sub> release may alter efficacy of this microbially mediated CH<sub>4</sub> sink. Here we investigate the composition and principle controls on abundance and activity of the MOB communities at the shallow continental shelf west of Svalbard, which is subject to strong seasonal changes in oceanographic conditions. Covering a large area (364 km<sup>2</sup>), we measured vertical distribution of microbial methane oxidation (MOx) rates, MOB community composition, dissolved CH<sub>4</sub> concentrations, temperature and salinity four times throughout spring and summer during three consecutive years. Sequencing analyses of the <i>pmoA</i> gene revealed a small, relatively uniform community mainly composed of type-Ia methanotrophs (deep-sea 3 clade). We found highest MOx rates (7 nM d<sup>−1</sup>) in summer in bathymetric depressions filled with stagnant Atlantic Water containing moderate concentrations of dissolved CH<sub>4</sub> (< 100 nM). MOx rates in these depressions during spring were much lower (< 0.5 nM <sup>d−1</sup>) due to lower temperatures and mixing of Transformed Atlantic Water flushing MOB with the Atlantic Water out of the depressions. Our results show that MOB and MOx in CH<sub>4</sub>-rich bottom waters are highly affected by geomorphology and seasonal conditions.en_US
dc.identifier.citationGründger F, Probandt D, Knittel K, Carrier V, Kalenitchenko D, Silyakova A, Serov P, Ferré B, Svenning MM, Niemann H. Seasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seeps. Limnology and Oceanography. 2021;9999:1-19en_US
dc.identifier.cristinIDFRIDAID 1903153
dc.identifier.doi10.1002/lno.11731
dc.identifier.issn0024-3590
dc.identifier.issn1939-5590
dc.identifier.urihttps://hdl.handle.net/10037/21556
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.ispartofCarrier, V. (2021). Microbial community structure associated to Arctic cold seeps. (Doctoral thesis). <a href=https://hdl.handle.net/10037/22978>https://hdl.handle.net/10037/22978</a>.
dc.relation.journalLimnology and Oceanography
dc.relation.projectIDNorges forskningsråd: 223259en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400en_US
dc.titleSeasonal shifts of microbial methane oxidation in Arctic shelf waters above gas seepsen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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