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dc.contributor.authorRuben, Manuel
dc.contributor.authorHefter, Jens
dc.contributor.authorSchubotz, Florence
dc.contributor.authorGeibert, Walter
dc.contributor.authorButzin, Martin
dc.contributor.authorGentz, Torben
dc.contributor.authorGrotheer, Hendrik
dc.contributor.authorForwick, Matthias
dc.contributor.authorSzczuciński, Witold
dc.contributor.authorMollenhauer, Gesine
dc.date.accessioned2023-09-01T08:54:01Z
dc.date.available2023-09-01T08:54:01Z
dc.date.issued2023
dc.description.abstractRock-derived or petrogenic organic carbon has traditionally been regarded as being non-bioavailable and bypassing the active carbon cycle when eroded. However, it has become apparent that this organic carbon might not be so inert, especially in fjord systems where petrogenic organic carbon influxes can be high, making its degradation another potential source of greenhouse gas emissions. The extent to which subsurface micro-organisms use this organic carbon is not well constrained, despite its potential impacts on global carbon cycling. Here, we performed compound-specific radiocarbon analyses on intact polar lipid–fatty acids of live micro-organisms from marine sediments in Hornsund Fjord, Svalbard. By this means, we estimate that local bacterial communities utilize between 5 ± 2% and 55 ± 6% (average of 25 ± 16%) of petrogenic organic carbon for their biosynthesis, providing evidence for the important role of petrogenic organic carbon as a substrate after sediment redeposition. We hypothesize that the lack of sufficient recently synthesized organic carbon from primary production forces micro-organisms into utilization of petrogenic organic carbon as an alternative energy source. The input of petrogenic organic carbon to marine sediments and subsequent utilization by subsurface micro-organisms represents a natural source of fossil greenhouse gas emissions over geological timescalesen_US
dc.identifier.citationRuben, Hefter J, Schubotz F, Geibert W, Butzin M, Gentz, Grotheer, Forwick M, Szczuciński W, Mollenhauer G. Fossil organic carbon utilization in marine Arctic fjord sediments by subsurface micro-organisms. Nature Geoscience. 2023en_US
dc.identifier.cristinIDFRIDAID 2156391
dc.identifier.doi10.1038/s41561-023-01198-z
dc.identifier.issn1752-0894
dc.identifier.issn1752-0908
dc.identifier.urihttps://hdl.handle.net/10037/30612
dc.language.isoengen_US
dc.relation.journalNature Geoscience
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2023 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleFossil organic carbon utilization in marine Arctic fjord sediments by subsurface micro-organismsen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US


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Attribution 4.0 International (CC BY 4.0)
Med mindre det står noe annet, er denne innførselens lisens beskrevet som Attribution 4.0 International (CC BY 4.0)