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dc.contributor.authorCohen, Jonathan H.
dc.contributor.authorLast, Kim
dc.contributor.authorCharpentier, Corie L.
dc.contributor.authorCottier, Finlo
dc.contributor.authorDaase, Malin
dc.contributor.authorHobbs, Laura
dc.contributor.authorJohnsen, Geir
dc.contributor.authorBerge, Jørgen
dc.date.accessioned2021-11-19T08:57:08Z
dc.date.available2021-11-19T08:57:08Z
dc.date.issued2021-10-19
dc.description.abstractLight plays a fundamental role in the ecology of organisms in nearly all habitats on Earth and is central for processes such as vision and the entrainment of the circadian clock. The poles represent extreme light regimes with an annual light cycle including periods of Midnight Sun and Polar Night. The Arctic Ocean extends to the North Pole, and marine light extremes reach their maximum extent in this habitat. During the Polar Night, traditional definitions of day and night and seasonal photoperiod become irrelevant since there are only “twilight” periods defined by the sun’s elevation below the horizon at midday; we term this “midday twilight.” Here, we characterize light across a latitudinal gradient (76.5° N to 81° N) during Polar Night in January. Our light measurements demonstrate that the classical solar diel light cycle dominant at lower latitudes is modulated during Arctic Polar Night by lunar and auroral components. We therefore question whether this particular ambient light environment is relevant to behavioral and visual processes. We reveal from acoustic field observations that the zooplankton community is undergoing diel vertical migration (DVM) behavior. Furthermore, using electroretinogram (ERG) recording under constant darkness, we show that the main migratory species, Arctic krill (Thysanoessa inermis) show endogenous increases in visual sensitivity during the subjective night. This change in sensitivity is comparable to that under exogenous dim light acclimations, although differences in speed of vision suggest separate mechanisms. We conclude that the extremely weak midday twilight experienced by krill at high latitudes during the darkest parts of the year has physiological and ecological relevance.en_US
dc.identifier.citationCohen, Last, Charpentier, Cottier, Daase, Hobbs, Johnsen, Berge. Photophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Night. PLoS Biology. 2021;19(10)en_US
dc.identifier.cristinIDFRIDAID 1949501
dc.identifier.doi10.1371/journal.pbio.3001413
dc.identifier.issn1544-9173
dc.identifier.issn1545-7885
dc.identifier.urihttps://hdl.handle.net/10037/23083
dc.language.isoengen_US
dc.publisherPublic Library of Scienceen_US
dc.relation.journalPLoS Biology
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/24419/Norway/Arctic Ocean ecosystems - Applied technology, Biological interactions and Consequences in an era of abrupt climate change//en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/KLIMAFORSK/300333/Norway/The impact of artificial light on arctic marine organisms and ecosystems during the polar night//en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 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.titlePhotophysiological cycles in Arctic krill are entrained by weak midday twilight during the Polar Nighten_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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