Basking hamsters reduce resting metabolism, body temperature and energy costs during rewarming from torpor

Author(s)
Geiser, Fritz
Gasch, Kristina
Bieber, Claudia
Stalder, Gabrielle L
Gerritsmann, Hanno
Ruf, Thomas
Publication Date
2016
Abstract
Basking can substantially reduce thermoregulatory energy expenditure of mammals. We tested the hypothesis that the largely white winter fur of hamsters ('Phodopus sungorus'), originating from Asian steppes,may be related to camouflage to permit sun basking on or near snow. Winter-acclimated hamsters in our study were largely white and had a high proclivity to bask when resting and torpid. Resting hamsters reduced metabolic rate (MR) significantly (>30%) when basking at ambient temperatures (Tₐ) of ~15 and 0°C. Interestingly, body temperature (Tb) also was significantly reduced from 34.7±0.6°C (Tₐ 15°C, not basking) to 30.4±2.0°C (Tₐ 0°C, basking), which resulted in an extremely low (<50% of predicted) apparent thermal conductance. Induced torpor (food withheld) during respirometry at Tₐ 15°C occurred on 83.3±36.0% of days and the minimum torpor MR was 36% of basal MR at an average Tb of 22.0±2.6°C; movement to the basking lamp occurred at Tb<20.0°C. Energy expenditure for rewarming was significantly reduced (by >50%) during radiant heat-assisted rewarming; however, radiant heat per se without an endogenous contribution by animals did not strongly affect metabolism and Tb during torpor. Our data show that basking substantially modifies thermal energetics in hamsters, with a drop of resting Tb and MR not previously observed and a reduction of rewarming costs. The energy savings afforded by basking in hamsters suggest that this behaviour is of energetic significance not only for mammals living in deserts, where basking is common, but also for 'P. sungorus' and probably other cold-climate mammals.
Citation
The Journal of Experimental Biology, 219(14), p. 2166-2172
ISSN
1477-9145
0022-0949
Link
Publisher
The Company of Biologists Ltd
Title
Basking hamsters reduce resting metabolism, body temperature and energy costs during rewarming from torpor
Type of document
Journal Article
Entity Type
Publication

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