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dc.contributor.authorKohlbach, Doreen
dc.contributor.authorGoraguer, Lucie
dc.contributor.authorBodur, Yasemin V.
dc.contributor.authorMüller, Oliver
dc.contributor.authorAmargant Arumí, Martí
dc.contributor.authorBlix, Katalin
dc.contributor.authorBratbak, Gunnar
dc.contributor.authorChierici, Melissa
dc.contributor.authorDabrowska, Anna Maria
dc.contributor.authorDietrich, Ulrike
dc.contributor.authorEdvardsen, Bente
dc.contributor.authorGarcia, Laura
dc.contributor.authorGradinger, Rolf Rudolf
dc.contributor.authorHop, Haakon
dc.contributor.authorJones, Elizabeth Marie
dc.contributor.authorØyvind, Lundesgaard
dc.contributor.authorOlsen, Lasse Mork
dc.contributor.authorReigstad, Marit
dc.contributor.authorSaubrekka, Karoline
dc.contributor.authorTatarek, Agnieszka
dc.contributor.authorWiktor, Josef Maria
dc.contributor.authorWold, Anette
dc.contributor.authorAssmy, Philipp
dc.date.accessioned2023-09-01T13:07:16Z
dc.date.available2023-09-01T13:07:16Z
dc.date.issued2023-03-27
dc.description.abstractThe decrease in Arctic sea-ice extent and thickness as a result of global warming will impact the timing, duration, magnitude and composition of phytoplankton production with cascading effects on Arctic marine food-webs and biogeochemical cycles. Here, we elucidate the environmental drivers shaping the composition, abundance, biomass, trophic state and vertical flux of protists (unicellular eukaryotes), including phytoplankton, in the Barents Sea in late August 2018 and 2019. The two years were characterized by contrasting sea-ice conditions. In August 2018, the sea-ice edge had retreated well beyond the shelf break into the Nansen Basin (>82°N), while in 2019, extensive areas of the northwestern Barents Sea shelf (>79°N) were still ice-covered. These contrasting sea-ice conditions resulted in marked interannual differences in the pelagic protist community structure in this area. In August 2018, the protist community was in a post-bloom stage of seasonal succession characterized by oligotrophic surface waters and dominance of small-sized phytoplankton and heterotrophic protists (predominantly flagellates and ciliates) at most stations. In 2019, a higher contribution of autotrophs and large-celled phytoplankton, particularly diatoms, to total protist biomass compared to 2018 was reflected in higher chlorophyll a concentrations and suggested that the protist community was still in a late bloom stage at some stations. It is noteworthy that particularly diatoms contributed a considerably higher proportion to the protist biomass at the ice-covered stations in both years compared to the open-water stations. This pattern was also evident in the higher vertical protist biomass flux in 2019, dominated by dinoflagellates and diatoms, compared to 2018. Our results suggest that the predicted transition toward an ice-free Barents Sea will lengthen the oligotrophic summer period with low algal biomass and associated low vertical flux.en_US
dc.identifier.citationKohlbach D, Goraguer, Bodur YV, Müller O, Amargant Arumí MA, Blix K, Bratbak G, Chierici M, Dabrowska AM, Dietrich U, Edvardsen B, Garcia, Gradinger R, Hop H, Jones EM, Øyvind, Olsen LM, Reigstad M, Saubrekka K, Tatarek A, Wiktor JM, Wold A, Assmy P. Earlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical flux. Progress in Oceanography. 2023;213en_US
dc.identifier.cristinIDFRIDAID 2137827
dc.identifier.doi10.1016/j.pocean.2023.103018
dc.identifier.issn0079-6611
dc.identifier.issn1873-4472
dc.identifier.urihttps://hdl.handle.net/10037/30634
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalProgress in Oceanography
dc.relation.projectIDNorges forskningsråd: 276730en_US
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.titleEarlier sea-ice melt extends the oligotrophic summer period in the Barents Sea with low algal biomass and associated low vertical fluxen_US
dc.type.versionpublishedVersionen_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)