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dc.contributor.authorOfstad, Siri
dc.contributor.authorMeilland, Julie
dc.contributor.authorZamelczyk, Katarzyna
dc.contributor.authorChierici, Melissa
dc.contributor.authorFransson, Agneta
dc.contributor.authorGründger, Friederike
dc.contributor.authorRasmussen, Tine Lander
dc.date.accessioned2020-03-03T07:33:58Z
dc.date.available2020-03-03T07:33:58Z
dc.date.created2020-02-26T09:04:16Z
dc.date.issued2020
dc.identifier.issn2169-8953
dc.identifier.urihttp://hdl.handle.net/11250/2644774
dc.description.abstractAlthough the plankton communities in the Barents Sea have been intensely studied for decades, little is known about the living planktonic foraminiferal (LPF) and pteropod faunas, especially those found at methane seep sites. Along a repeated transect in the “crater area” (northern Barents Sea, 74.9°N, 27.7°E) in spring and summer 2016 the flux of LPF and of the pteropod species Limacina helicina showed a high degree of variability. The LPF had low concentration (0–6 individuals m−3) and small tests (x̄ = 103.3 μm) in spring and a 53‐fold increase (43–436 individuals m−3) and larger tests (x̄ = 188.6 μm) in summer. Similarly, the concentration of L. helicina showed a tenfold increase between spring and summer. The LPF species composition remained stable with the exception of the appearance of subtropical species in summer. No relationship was observed between the spatial distribution of LPF, L. helicina, and methane concentrations in the area. The methane plumes in April coincided with elevated dissolved inorganic carbon, low pH, and calcium carbonate saturation states, and the methane concentration seemed to be controlled by lateral advection. The δ13C and δ18O of Neogloboquadrina pachyderma and Turborotalita quinqueloba are comparable to previous observations in the Arctic and do not show any influence of methane in the isotopic signals of the shells. Although no evidence of direct impact of high methane concentrations on the LPF (size and concentration) were found, we speculate that methane could indirectly enhance primary productivity, and thus biomass, through several potential pathwaysnb_NO
dc.language.isoengnb_NO
dc.titleDevelopment, productivity, and seasonality of living planktonic foraminiferal faunas and Limacina helicina in an area of intense methane seepage in the Barents Seanb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.volume125nb_NO
dc.source.journalJournal of Geophysical Research (JGR): Biogeosciencesnb_NO
dc.source.issue2nb_NO
dc.identifier.doi10.1029/2019JG005387
dc.identifier.cristin1797609
dc.relation.projectNorges forskningsråd: 223259nb_NO
cristin.unitcode7431,20,0,0
cristin.unitnameOseanografi og klima
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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