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Type of publication: Journal Article
Type of document: Full Paper

Year: 2016

Authors: Geiser, F; Gasch, K; Bieber, C; Stalder, GL; Gerritsmann, H; Ruf, T

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

Source: J Exp Biol. 2016; 219(Pt 14):2166-2172



Authors Vetmeduni Vienna:

Bieber Claudia
Gerritsmann Hanno
Ruf Thomas
Stalder Gabrielle

Vetmed Research Units
Research Institute of Wildlife Ecology


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.© 2016. Published by The Company of Biologists Ltd.

Keywords Pubmed: Animals
Basal Metabolismphysiology
Body Temperaturephysiology
Body Temperature Regulationphysiology
Cricetinae
Energy Metabolismphysiology
Female
Male
Restphysiology
Rewarming
Thermal Conductivity
Time Factors
Torporphysiology

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