Drivers of hibernation: linking food and weather to denning behaviour of grizzly bears
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Climate-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.
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.
KeywordsBehavioural plasticity Phenology Food availability Den Brown bear Ursus arctos
We thank the Alberta Ecotrust, Y2Y Sarah Baker Memorial Fund, Alberta Conservation Association, Natural Sciences and Engineering Research Council of Canada (NSERC) and fRI Research partners for providing research funds. Université Laval, Centre d’Études Nordiques and NSERC provided funding for conferences to KEP. We thank J. Duval and D. Weins for GIS support; D. Talbot and A.-S. Julien for their help with statistical analyses; R. Théorêt-Gosselin, R. Strong, A. Auger, E. Rogers, C. Curle, T. Larsen, E. Cardinal, P. Stenhouse and A. Stenhouse for collecting field data; and J. Saunders and S. Wotton at Peregrine Helicopters. E. Cardinal, T. Larsen, Ö. E. Can and two anonymous reviewers provided helpful comments and suggestions that improved the manuscript.
Compliance with ethical standards
Capture and handling of grizzly bears were approved by the University of Saskatchewan Animal Care Committee and were in accordance with the American Society of Mammalogists guidelines (Sikes et al. 2011), and all applicable national and institutional guidelines for the care of animals were followed.
Conflict of interest
KEP received a research grant from Alberta Conservation Association Grant in Biodiversity (2009). All authors declare that they have no conflict of interest.
This study was funded by Alberta Ecotrust (2011) and fRI Research Partners.
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