Journal
AMERICAN NATURALIST
Volume 177, Issue 4, Pages 452-461Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/658150
Keywords
cost-benefit model of thermoregulation; thermal quality; Carlia; skink; lizard; reptile
Categories
Funding
- Australian Research Council
- Hinchinbrook Island Ferries
Ask authors/readers for more resources
The classic cost-benefit model of ectothermic thermoregulation compares energetic costs and benefits, providing a critical framework for understanding this process (Huey and Slatkin 1976). It considers the case where environmental temperature (T-e) is less than the selected temperature of the organism (T-sel), and it predicts that, to minimize increasing energetic costs of thermoregulation as habitat thermal quality declines, thermoregulatory effort should decrease until the lizard thermoconforms. We extended this model to include the case where T-e exceeds T-sel, and we redefine costs and benefits in terms of fitness to include effects of body temperature (T-b) on performance and survival. Our extended model predicts that lizards will increase thermoregulatory effort as habitat thermal quality declines, gaining the fitness benefits of optimal T-b and maximizing the net benefit of activity. Further, to offset the disproportionately high fitness costs of high T-e compared with low T-e, we predicted that lizards would thermoregulate more effectively at high values of T-e than at low ones. We tested our predictions on three sympatric skink species (Carlia rostralis, Carlia rubrigularis, and Carlia storri) in hot savanna woodlands and found that thermoregulatory effort increased as thermal quality declined and that lizards thermoregulated most effectively at high values of T-e.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available