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dc.contributor.authorBarth-Jensen, Coralie Marie Christine
dc.contributor.authorDaase, Malin
dc.contributor.authorOrmańczyk, M.R.
dc.contributor.authorVarpe, Øystein
dc.contributor.authorKwaśniewski, Sławomir
dc.contributor.authorSvensen, Camilla
dc.date.accessioned2022-08-04T12:11:54Z
dc.date.available2022-08-04T12:11:54Z
dc.date.issued2022-02-15
dc.description.abstractThe traditional view is that the Arctic polar night is a quiescent period for marine life, but recent reports of high levels of feeding and reproduction in both pelagic and benthic taxa have challenged this. We examined the zooplankton community present in Svalbard fjords, coastal waters, and the shelf break north of Svalbard, during the polar night. We focused on the population structure of abundant copepods (Calanus finmarchicus, Calanus glacialis, Metridia longa, Oithona similis, Pseudocalanus spp., Microcalanus spp., and Microsetella norvegica) sampled using 64-µm mesh nets. Numerically, copepod nauplii (≥ 50%) and the young developmental stages of small copepods (< 2 mm prosome length as adult) dominated the samples. Three main patterns were identified: (1) large Calanus spp. were predominantly older copepodids CIV–CV, while (2) the small harpacticoid M. norvegica were adults. (3) For other species, all copepodid stages were present. Older copepodids and adults dominated populations of O. similis, Pseudocalanus spp. and M. longa. In Microcalanus spp., high proportion of young copepodids CI–CIII indicated active winter recruitment. We discuss the notion of winter as a developing and reproductive period for small copepods in light of observed age structures, presence of nauplii, and previous knowledge about the species. Lower predation risks during winter may, in part, explain why this season could be beneficial as a period for development. Winter may be a key season for development of small, omnivorous copepods in the Arctic, whereas large copepods such as Calanus spp. seems to be reliant on spring and summer for reproduction and development.en_US
dc.identifier.citationBarth-Jensen, Daase, Ormańczyk, Varpe, Kwaśniewski, Svensen. High abundances of small copepods early developmental stages and nauplii strengthen the perception of a non-dormant Arctic winter. Polar Biology. 2022;45(4):675-690en_US
dc.identifier.cristinIDFRIDAID 2026353
dc.identifier.doi10.1007/s00300-022-03025-4
dc.identifier.issn0722-4060
dc.identifier.issn1432-2056
dc.identifier.urihttps://hdl.handle.net/10037/25961
dc.language.isoengen_US
dc.publisherSpringeren_US
dc.relation.ispartofBarth-Jensen, C. (2023). Population dynamics and production of small, marine copepods in highly seasonal Arctic and sub-Arctic environments. (Doctoral thesis). <a href=https://hdl.handle.net/10037/28664>https://hdl.handle.net/10037/28664</a>.
dc.relation.journalPolar Biology
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.titleHigh abundances of small copepods early developmental stages and nauplii strengthen the perception of a non-dormant Arctic winteren_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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