Drivers of hibernation : linking food and weather to denning behaviour of grizzly bears

DC FieldValueLanguage
dc.contributor.authorPigeon, Karine-
dc.contributor.authorStenhouse, Gordon B.-
dc.contributor.authorCôté, Steeve D.-
dc.coverage.spatialRocheuses canadiennes (C.-B. et Alb.)fr
dc.date.accessioned2017-04-19T15:40:54Z-
dc.date.available10000-01-01-
dc.date.issued2016-07-06fr
dc.identifier.issn1432-0762fr
dc.identifier.urihttp://hdl.handle.net/20.500.11794/13709-
dc.description.abstractClimate-induced changes in the phenology of hibernation for bear species could result in altered energy budgets, reduced cub survival and fitness and increased human-bear conflicts. Using 11 years of data, we determined the amount of variation in den entry and den exit dates that could be attributed to sex and reproductive status, weather and berry availability for 15 male and 58 female grizzly bears (Ursus arctos). We estimated berry availability during autumn using a probability surface of berry productivity within the home range of 13 individuals over 3 years. Sex and reproductive status explained 22 and 14 % of the variation in den entry and den exit dates, respectively. Weather did not influence the timing of den entry but berry availability in autumn explained 39 % of the variation observed in den entry, and high berry availability was associated with late den entry. Elevation and spring temperatures, and elevation and winter precipitation, respectively, explained 26 and 21 % of the variation observed in den exit dates. Increasing spring average monthly maximum temperature by 4 °C resulted in bears emerging from dens 10 days earlier and an increase of 1.25 m in snow precipitation delayed den exit by 1 week. We demonstrate that although the phenology of hibernation for grizzly bears depends on sex and reproductive status, den entry appears to be driven by food availability, while den exit is more linked to weather. Extended growing seasons and mild meteorological conditions should result in shorter denning periods for grizzly bears. Significance statement Climate change is altering the phenology of spring green-up and the onset of winter, disrupting the seasonal behaviours of species. Climate change can act as an additional strain on threatened populations, especially during energetically demanding periods such as hibernation. We quantified the importance of intrinsic and extrinsic factors including food availability and weather in the hibernation behaviour of grizzly bears. High berry availability was associated with late den entry, while low winter precipitation and high spring temperature resulted in early den exit. We conclude that den entry is more driven by food availability while den exit is more linked to weather. This dichotomy in factors affecting den entry and den exit has implications for the long-term conservation of grizzly bear populations because extended growing seasons and mild meteorological conditions expected under future climate conditions should result in shorter denning periods.fr
dc.languageengfr
dc.publisherSpringerfr
dc.subjectBehavioural plasticityfr
dc.subjectPhenologyfr
dc.subjectFood availabilityfr
dc.subjectDenfr
dc.subjectBrown bearfr
dc.subjectUrsus arctosfr
dc.titleDrivers of hibernation : linking food and weather to denning behaviour of grizzly bearsfr
dc.typeCOAR1_1::Texte::Périodique::Revue::Contribution à un journal::Article::Article de recherchefr
dcterms.bibliographicCitationBehavioral Ecology and Sociobiology, Vol. 70 (10), 1745–1754 (2016)fr
dc.audienceProfesseurs (Enseignement supérieur)fr
dc.audienceÉtudiantsfr
dc.audienceDoctorantsfr
dc.audienceBiologistesfr
dc.identifier.doi10.1007/s00265-016-2180-5fr
dc.subject.rvmGrizzly -- Phénologiefr
dc.subject.rvmHibernationfr
dc.subject.rvmGrizzly -- Mœurs et comportementfr
dcterms.date.accepted2016-06-29-
rioxxterms.versionVersion of Recordfr
rioxxterms.version_of_recordhttps://doi.org/10.1007/s00265-016-2180-5fr
rioxxterms.project.funder_nameNatural Sciences and Engineering Research Council of Canadafr
bul.rights.periodeEmbargoInfinifr
Collection:Articles publiés dans des revues avec comité de lecture

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