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Oecologia

, Volume 181, Issue 4, pp 1101–1116 | Cite as

Staying cool in a changing landscape: the influence of maximum daily ambient temperature on grizzly bear habitat selection

  • Karine E. PigeonEmail author
  • Etienne Cardinal
  • Gordon B. Stenhouse
  • Steeve D. Côté
Behavioral ecology – original research

Abstract

To fulfill their needs, animals are constantly making trade-offs among limiting factors. Although there is growing evidence about the impact of ambient temperature on habitat selection in mammals, the role of environmental conditions and thermoregulation on apex predators is poorly understood. Our objective was to investigate the influence of ambient temperature on habitat selection patterns of grizzly bears in the managed landscape of Alberta, Canada. Grizzly bear habitat selection followed a daily and seasonal pattern that was influenced by ambient temperature, with adult males showing stronger responses than females to warm temperatures. Cutblocks aged 0–20 years provided an abundance of forage but were on average 6 °C warmer than mature conifer stands and 21- to 40-year-old cutblocks. When ambient temperatures increased, the relative change (odds ratio) in the probability of selection for 0- to 20-year-old cutblocks decreased during the hottest part of the day and increased during cooler periods, especially for males. Concurrently, the probability of selection for 21- to 40-year-old cutblocks increased on warmer days. Following plant phenology, the odds of selecting 0- to 20-year-old cutblocks also increased from early to late summer while the odds of selecting 21- to 40-year-old cutblocks decreased. Our results demonstrate that ambient temperatures, and therefore thermal requirements, play a significant role in habitat selection patterns and behaviour of grizzly bears. In a changing climate, large mammals may increasingly need to adjust spatial and temporal selection patterns in response to thermal constraints.

Keywords

Thermoregulation Climate change Ursus arctos Trade off Phenology 

Notes

Acknowledgments

We thank the Alberta Ecotrust, the Y2Y Sarah Baker Memorial Fund, the Alberta Conservation Association, the Natural Sciences and Engineering Research Council of Canada, and the FRI Research Grizzly Bear Program partners for providing research funds. L’Université Laval, the Centre d’Études Nordiques, and the Natural Sciences and Engineering Research Council of Canada provided scholarships and funding for conferences to K. E. P. We thank J. Duval and D. Weins for geographic information system support; A.-S. Julien for help with statistical analyses; R. Théorêt-Gosselin, R. Strong, A. Auger, E. Rogers, C. Curle, T. Larsen, P. Stenhouse, and A. Stenhouse for collecting field data; two anonymous reviewers for commenting on this manuscript; and J. Saunders and S. Wotton at Peregrine Helicopters.

Author contribution statement

K. E. P. and G. B. S. originally formulated the idea. K. E. P. developed the methodology under the supervision of S. D. C. and G. B. S. K. E. P. conducted fieldwork and collaborated with E. C. to perform the statistical analyses. K. E. P. and E. C. wrote the manuscript while G. B. S. and S. D. C. provided advice.

Supplementary material

442_2016_3630_MOESM1_ESM.docx (13.3 mb)
Supplementary material 1 (DOCX 13667 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Karine E. Pigeon
    • 1
    • 2
    Email author
  • Etienne Cardinal
    • 1
  • Gordon B. Stenhouse
    • 1
  • Steeve D. Côté
    • 2
  1. 1.FRI Research Grizzly Bear Program (FRIGBP)HintonCanada
  2. 2.Département de biologie and Centre d’études NordiquesUniversité LavalQuébecCanada

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