Fossil organic carbon utilization in marine Arctic fjord sediments by subsurface micro-organisms

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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.accessioned2023-07-13T06:37:27Z
dc.date.available2023-07-13T06:37:27Z
dc.date.issued2023-07
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 timescales.pl
dc.description.sponsorshipPolish National Science Centre (NCN) grant no. 2013/10/E/ST10/00166; Deutsche Forschungsgemeinschaft (DFG, German Science Foundation) under Germany’s Excellence Strategy EXC 2077 390741603 ; German Federal Ministry of Education and Research (BMBF) through project PalMod and is additionally funded through DFG-ANR project MARCARA; Open access funding provided by Alfred-Wegener-Institut.pl
dc.identifier.citationNature Geoscience vol. 16, 2023, pp. 625–630.pl
dc.identifier.issn1752-0894
dc.identifier.urihttps://hdl.handle.net/10593/27327
dc.language.isoengpl
dc.rightsUznanie autorstwa-Użycie niekomercyjne-Bez utworów zależnych 3.0 Polska*
dc.rightsinfo:eu-repo/semantics/openAccesspl
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/pl/*
dc.subjectorganic carbonpl
dc.subjectradiocarbonpl
dc.subjectpetrogenic carbonpl
dc.subjectSvalbardpl
dc.subjectHornsundpl
dc.subjectcarbon cyclepl
dc.subjectfjordpl
dc.subjectfjord sedimentspl
dc.subjectmarine sedimentspl
dc.subject210Pb datingpl
dc.subject137Cs datingpl
dc.subjectbiomarkerspl
dc.subjectArcticpl
dc.subjectpolar researchpl
dc.subjectlipid-fatty acidspl
dc.subjectcarbon burialpl
dc.titleFossil organic carbon utilization in marine Arctic fjord sediments by subsurface micro-organismspl
dc.typeArtykułpl

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