Effects of temperature acclimation on maximum heat production, thermal tolerance, and torpor in a marsupial

Title
Effects of temperature acclimation on maximum heat production, thermal tolerance, and torpor in a marsupial
Publication Date
2003
Author(s)
Geiser, Fritz
( author )
OrcID: https://orcid.org/0000-0001-7621-5049
Email: fgeiser@une.edu.au
UNE Id une-id:fgeiser
Drury, Rebecca L
McAllan, Bronwyn Marie
Wang, D.H.
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Springer
Place of publication
Germany
UNE publication id
une:3146
Abstract
Marsupials, unlike placental mammals, are believed to be unable to increase heat production and thermal performance after cold-acclimation. It has been suggested that this may be because marsupials lack functional brown fat, a thermogenic tissue, which proliferates during cold-acclimation in many placentals. However, arid zone marsupials have to cope with unpredictable, short-term and occasionally extreme changes in environmental conditions, and thus they benefit from an appropriate physiological response. We therefore investigated whether a sequential two to four week acclimation in 'Sminthopsis macroura' (body mass approx. 25 g) to both cold (16°C) and warm (26°C) ambient temperatures affects the thermal physiology of the species. Cold-acclimated 'S. macroura' were able to significantly increase maximum heat production (by 27%) and could maintain a constant body temperature at significantly lower effective ambient temperatures (about 9°C lower) than when warm-acclimated. Moreover, metabolic rates during torpor were increased following cold-acclimation in comparison to warm-acclimation. Our study shows that, despite the lack of functional brown fat, short-term acclimation can have significant effects on thermoenergetics of marsupials. It is likely that the rapid response in 'S. macroura' reflects an adaptation to the unpredictability of the climate in their habitat.
Link
Citation
Journal of Comparative Physiology B, 173(5), p. 437-442
ISSN
1432-136X
0174-1578
Start page
437
End page
442

Files:

NameSizeformatDescriptionLink