Journal article
PHYSIOLOGICAL CONTROL OF HEAT EXCHANGE IN IGUANAS
American zoologist, Vol.38(5)
01 Nov 1998
Abstract
Physiological control of heat exchange in reptiles depends mainly on varying time constants of warming and cooling. We investigated the physiological control of heat exchange in Iguana iguana and the implications of that control for shuttling behavior and for thermoregulation using both modeling and experiments. We measured core and surface body temperature and subcutaneous capillary blood flow in the limbs and torso during warming and cooling to determine long and short time constants. Time constants were determined by fitting a simple heat transfer model of body temperature to the measured deep body temperatures. Time constants for large (750 to 1000g) animals ranged from 45-50 min with greater time constants during cooling than warming. Subcutaneous .blood flow at the limbs and torso doubled upon warming and returned to the baseline value upon cooling. Blood flow initially changed gradually over the course of warming or cooling finally coming to a plateau. Using parameters determined experimentally, predicted body temperatures under various shuttling regimes were examined for iguanas of varying masses.
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Details
- Title
- PHYSIOLOGICAL CONTROL OF HEAT EXCHANGE IN IGUANAS
- Creators
- E.M DzialowskiM.P O'Connor
- Publication Details
- American zoologist, Vol.38(5)
- Publisher
- Society for Integrative and Comparative Biology(SICB)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Identifiers
- 991020950493304721