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dc.contributor.authorThiel, Alexandra
dc.contributor.authorGiroud, Sylvain
dc.contributor.authorHertel, Anne Gabriela
dc.contributor.authorFriebe, Andrea
dc.contributor.authorDevineau, Olivier
dc.contributor.authorFuchs, Boris
dc.contributor.authorBlanc, Stephane
dc.contributor.authorStøen, Ole-Gunnar
dc.contributor.authorLaske, Timothy G.
dc.contributor.authorArnemo, Jon Martin
dc.contributor.authorEvans, Alina
dc.date.accessioned2022-08-03T12:21:13Z
dc.date.available2022-08-03T12:21:13Z
dc.date.created2022-05-11T13:03:24Z
dc.date.issued2022
dc.identifier.citationFrontiers in Materials. 2022, 13 .en_US
dc.identifier.issn2296-8016
dc.identifier.urihttps://hdl.handle.net/11250/3009969
dc.description.abstractBiological rhythms, such as rhythms in activity and body temperature, are usually highly synchronized and entrained by environmental conditions, such as photoperiod. However, how the expression of these rhythms changes during hibernation, when the perception of environmental cues is limited, has not yet been fully understood for all hibernators, especially in the wild. The brown bear (Ursus arctos) in Scandinavia lives in a highly seasonal environment and adapts to harsh winter conditions by exhibiting hibernation, characterized by reduced metabolism and activity. In this study, we aimed to explore the expression of biological rhythms in activity, body temperature and heart rate of free-ranging brown bears over the annual cycle, including active, hibernation and the transition states around den entry and exit. We found that rhythms in physiology and activity are mostly synchronized and entrained by the light-dark cycle during the bears’ active state with predominantly diel and ultradian rhythms for body temperature, activity, and heart rate. However, during hibernation, rhythms in body temperature and heart rate were considerably slowed down to infradian rhythms, influenced by the amount of snow in the denning area, whereas rhythms in activity remained diel. Rhythms in the transition states when bears prepared for entering or coming out of hibernation state displayed a combination of infradian and diel rhythms, indicating the preparation of the body for the change in environmental conditions. These results reveal that brown bears adjust their biological rhythms to the seasonal environment they inhabit. Rhythms in physiology and activity show simultaneity during the active state but are partly disconnected from each other during hibernation, when bears are most sheltered from the environment.en_US
dc.language.isoengen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.subjectBrown bear (Ursus arctos)en_US
dc.subjectbody temperatureen_US
dc.subjectcircadian rhythmen_US
dc.subjectheart rateen_US
dc.subjecthibernationen_US
dc.subjectlomb-scargle periodogramen_US
dc.subjectmultiday rhythmsen_US
dc.subjectactivityen_US
dc.titleSeasonality in Biological Rhythms in Scandinavian brown Bearsen_US
dc.title.alternativeSeasonality in Biological Rhythms in Scandinavian brown Bearsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400en_US
dc.source.pagenumber0en_US
dc.source.volume13en_US
dc.source.journalFrontiers in Materialsen_US
dc.identifier.doi10.3389/fphys.2022.785706
dc.identifier.cristin2023529
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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