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Energy expenditure of the spotted snow skink, Niveoscincus ocellatus, at two climatic extremes of its distribution range
journal contribution
posted on 2023-05-18, 17:18 authored by Yuni, LPEK, Susan JonesSusan Jones, Erik WapstraErik WapstraThe study of energy expenditure between populations of a wide ranging ectothermic species may provide an insight into how organisms respond to variation in environmental conditions. In this study, the energy expenditure of male spotted snow skinks, Niveoscincus ocellatus, living at the two extremes of the species' distribution range (warm lowland versus cold alpine site) was measured using the doubly labelled water method. Males at the cold alpine site expended more energy per gram per hour compared to their counterparts living at the warm lowland site. Lizards living at high altitude were active at lower temperatures compared with those at the low altitude site, which resulted in a longer activity time for the highland population. However, the differences in energy expenditure cannot be explained only by these differences in activity time. We further suggest that at the cold alpine site, lizards compensated for the low temperatures by elevating their metabolism which subsequently increased their energy expenditure. An elevated metabolic rate combined with modified thermoregulatory behaviour is likely an important mechanism allowing N. ocellatus to cope with the cold environments at high altitude sites.
Funding
Australian Research Council
History
Publication title
Journal of Thermal BiologyVolume
52Pagination
208-216ISSN
0306-4565Department/School
School of Natural SciencesPublisher
Pergamon-Elsevier Science LtdPlace of publication
The Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1GbRights statement
Copyright 2015 Elsevier Ltd.Repository Status
- Restricted