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- Title
The energetics of basking behaviour and torpor in a small marsupial exposed to simulated natural conditions.
- Authors
Warnecke, Lisa; Geiser, Fritz
- Abstract
Limited information is available on basking behaviour in torpid mammals and its energetic consequences. We investigated the effects of physiological and behavioural strategies on the energetics of the fat-tailed dunnart ( Sminthopsis crassicaudata). Metabolic rate and body temperature during torpor, basking and rest were measured over 24 h in response to simulated environmental conditions: (a) constant ambient temperature ( Ta) of 15°C, (b) constant Ta of 15°C with access to a radiant heat lamp, (c) a Ta cycle (range 15–31°C), and (d) a Ta cycle with access to a radiant heat lamp. When a radiant heat source was provided, all dunnarts ( n = 16) basked during all measurements, which resulted in energy savings of up to 74% during rest. Overall, torpor was used on 59% of measurements with a maximum duration of 16.2 h and reductions in metabolic rate of 90% compared to normothermic values. Torpid dunnarts actively moved from a shaded area to position themselves under the heat lamp with body temperatures as low as 17.5°C and thereby reduced rewarming costs by 66%. We demonstrated, for the first time in the laboratory, that torpid animals actively move to a heat source to bask, and that this behaviour results in considerable energy savings. Our finding supports the view that basking during normothermia and rewarming from torpor substantially reduces energetic requirements, which may be important for the survival of small dasyurids living on limited resources in the Australian arid zone.
- Subjects
MARSUPIALS; MAMMALS; ANIMAL behavior; BODY temperature; METABOLISM
- Publication
Journal of Comparative Physiology B: Biochemical, Systemic & Environmental Physiology, 2010, Vol 180, Issue 3, p437
- ISSN
0174-1578
- Publication type
Article
- DOI
10.1007/s00360-009-0417-6