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dc.contributor.authorWold, Anette
dc.contributor.authorHop, Haakon
dc.contributor.authorSvensen, Camilla
dc.contributor.authorSøreide, Janne
dc.contributor.authorAssmann, Karen
dc.contributor.authorOrmańczyk, M.R.
dc.contributor.authorKwasniewski, S
dc.date.accessioned2023-10-17T06:17:38Z
dc.date.available2023-10-17T06:17:38Z
dc.date.issued2023-09-29
dc.description.abstractThe Barents Sea is undergoing rapid ocean warming with less sea ice and increased Atlantic inflow, shifting the pelagic ecosystem towards a more boreal one, a process referred to as Atlantification. While such changes have already been documented in the southern and central Barents Sea, less is known about the degree of Atlantification in the northern Barents Sea and Arctic Ocean. In this seasonal study, we identified the mesozooplankton biodiversity, abundance and biomass in the Northern Barents Sea along a transect with seven stations stretching from the central Barents Sea (76◦N) across the shelf break and into the Arctic Ocean (82◦N) in August and December 2019, and March, May and July 2021. The broad range of mesozooplankton taxa and sizes were collected by conducting duplicate depth-stratified tows using alternate nets of mesh-sizes 64 µm and 180 µm. The majority of zooplankton taxa were ubiquitous in the study area, but the abundances and life stages varied depending on the season, region and the dominant water mass. We identified three distinct biogeographical regions with different zooplankton diversity and seasonal dynamics; (i) south of the Polar Front, (ii) northern Barents Sea shelf, and (iii) shelf slope and Arctic Ocean. During summer, high abundances of Atlantic/boreal and cosmopolitan zooplankton, mainly Calanus finmarchicus, Metridia longa, Oithona similis and Microsetella norvegica were found just south of the Polar Front in the central Barents Sea. On the shelf, Arctic species, such as Calanus glacialis, Pseudocalanus spp., and Limacina helicina dominated year-round with relatively high and stable biomass. At the northernmost stations, peaks of C. finmarchicus and Oncaeidae (Triconia borealis and Oncaea spp.) occurred in winter, combined with bathypelagic species such as Paraeuchaeta spp., Scaphocalanus brevicornis, Spinocalanus spp., Gaetanus brevispinus and Heterorhabdus norvegicus. Hence, when comparing the mesozooplankton communities at the different locations and seasons, four distinct communities were identified: shelf winter, shelf spring, shelf summer, and Arctic Ocean. Stronger advection and increased northward expansion of Atlantic zooplankton species are anticipated in the future, which could impact the diversity of the more endemic and energy-richer Arctic zooplankton communities.en_US
dc.identifier.citationWold, Hop, Svensen, Søreide, Assmann, Ormańczyk, Kwasniewski. Atlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Ocea. Progress in Oceanography. 2023en_US
dc.identifier.cristinIDFRIDAID 2185188
dc.identifier.doi10.1016/j.pocean.2023.103133
dc.identifier.issn0079-6611
dc.identifier.issn1873-4472
dc.identifier.urihttps://hdl.handle.net/10037/31575
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalProgress in Oceanography
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.titleAtlantification influences zooplankton communities seasonally in the northern Barents Sea and Arctic Oceaen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's license is described as Attribution 4.0 International (CC BY 4.0)