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dc.contributor.authorHobbs, Laura
dc.contributor.authorBanas, Neil S.
dc.contributor.authorCottier, Finlo Robert
dc.contributor.authorBerge, Jørgen
dc.contributor.authorDaase, Malin
dc.date.accessioned2021-02-26T09:57:32Z
dc.date.available2021-02-26T09:57:32Z
dc.date.issued2020-09-25
dc.description.abstractCopepods of the genus <i>Calanus</i> have adapted to high levels of seasonality in prey availability by entering a period of hibernation during winter known as diapause, but repeated observations of active <i>Calanus</i> spp. have been made in January in high latitude fjords which suggests plasticity in over-wintering strategies. During the last decade, the period of Polar Night has been studied intensively in the Arctic. A continuous presence of an active microbial food web suggests the prevalence of low-level alternative copepod prey (such as microzooplankton) throughout this period of darkness. Here we provide further evidence of mid-winter zooplankton activity using a decadal record of moored acoustics from Kongsfjorden, Svalbard. We apply an individual based life-history model to investigate the fitness consequences of a range of over-wintering strategies (in terms of diapause timing and duration) under a variety of prey availability scenarios. In scenarios of no winter prey availability (<i>P<sub>win</sub>=0μgCL<sup>−1</sup></i>), the optimal time to exit diapause is in March. However, as <i>P<sub>win</sub></i> increases (up to 40μ<i>gCL</i><sup>−1</sup>), there is little fitness difference in copepods exiting diapause in January compared to March. From this, we suggest that <i>Calanus</i> are able (in energetic terms) to either i) exit diapause early to deal with uncertainty in spring bloom timing, or ii) remain active throughout winter if diapause is not possible (i.e., environment not deep enough, or not enough lipid reserves built up over the previous summer). The range of viable overwintering strategies increases with increasing <i>P<sub>win</sub></i>, suggesting that there is more flexibility for <i>Calanus</i> spp. in a scenario of non-zero <i>P<sub>win</sub></i>.en_US
dc.identifier.citationHobbs, Banas, Cottier, Berge, Daase. Eat or sleep: Availability of winter prey explains mid-winter and spring activity in an Arctic Calanus population. Frontiers in Marine Science. 2020;7en_US
dc.identifier.cristinIDFRIDAID 1882653
dc.identifier.doi10.3389/fmars.2020.541564
dc.identifier.issn2296-7745
dc.identifier.urihttps://hdl.handle.net/10037/20613
dc.language.isoengen_US
dc.publisherFrontiers Mediaen_US
dc.relation.journalFrontiers in Marine Science
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/244319/Norway/Arctic Ocean ecosystems - Applied technology, Biological interactions and Consequences in an era of abrupt climate change//en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2020 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480en_US
dc.titleEat or sleep: Availability of winter prey explains mid-winter and spring activity in an Arctic Calanus populationen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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