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Hibernating patterns of free-ranging Columbian ground squirrels
1Dept. of Zoology, The University of Alberta, T6G 2E9, Edmonton, Alberta, Canada.
Oecologia
|March 18, 2017
Summary
Adult male Columbian ground squirrels (Spermophilus columbianus) hibernate differently, spending more time in euthermy (warm periods) than other groups. This suggests higher energy costs but potential benefits like increased reproduction.
Area of Science:
- Animal Behavior
- Hibernation Physiology
- Mammalian Ecology
Background:
- Hibernation is a survival strategy involving torpor and euthermy.
- Understanding hibernation patterns in Columbian ground squirrels (Spermophilus columbianus) is crucial for their population dynamics.
Purpose of the Study:
- To document and compare torpor and euthermy patterns during hibernation in free-ranging Columbian ground squirrels.
- To identify age and sex-specific differences in hibernation behavior.
Main Methods:
- Utilized temperature-sensitive radio transmitter collars on 28 free-ranging squirrels.
- Monitored hibernation patterns, including torpor bouts and euthermic intervals.
- Analyzed emergence timing and pre-emergence euthermic periods.
Main Results:
- Adult males initiated hibernation earlier, spent a greater proportion of the season euthermic, and emerged earlier than other age/sex classes.
- Hibernation patterns of adult females were similar to juveniles.
- Adult males exhibited a prolonged euthermic interval before emergence, unlike females and juveniles.
- Soil temperature did not appear to trigger emergence.
Conclusions:
- Adult males incur higher energy costs during hibernation due to extended euthermy.
- These costs may be offset by enhanced reproductive success in spring and reduced late-summer predation risk.
- Hibernation strategies vary significantly by age and sex in this species.
