Changes in dermal reflectance and vascularity and their effects on thermoregulation in Amphibolurus nuchalis (reptilia: Agamidae)

Rice, G. E. and Bradshaw, S. D. (1980) Changes in dermal reflectance and vascularity and their effects on thermoregulation in Amphibolurus nuchalis (reptilia: Agamidae). Journal of Comparative Physiology, 135 2: 139-146. doi:10.1007/BF00691203


Author Rice, G. E.
Bradshaw, S. D.
Title Changes in dermal reflectance and vascularity and their effects on thermoregulation in Amphibolurus nuchalis (reptilia: Agamidae)
Formatted title
Changes in dermal reflectance and vascularity and their effects on thermoregulation in Amphibolurus nuchalis (reptilia: Agamidae)
Journal name Journal of Comparative Physiology   Check publisher's open access policy
ISSN 0174-1578
1432-136X
Publication date 1980-06-01
Sub-type Article (original research)
DOI 10.1007/BF00691203
Volume 135
Issue 2
Start page 139
End page 146
Total pages 8
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract
1. The contributions made by changes in dermal reflectance and dermal vascularity to temperature regulation have been studied in the agamid lizard Amphibolurus nuchalis with the use of 85Kr and 133Xe.
2. Skin reflectivity varied directly with the body temperature, increasing at elevated body temperatures which decreased the rate of absorption of radiant energy. Decreases in body temperature below the preferred are accompanied by decreases in reflectance which increase the rate of absorption of radiant energy.
3. Subcutaneous blood flow varied directly with the body temperature when measured under conditions of thermal stability. This temperature-dependent increase in dermal blood flow is interpreted as a machanism facilitating the transfer of heat between the core and the periphery of the animal.
4. Peripheral blood vessels demonstrate the capacity to autoregulate and may dilate during basking as a result of local heating, facilitating the increase in dermal blood flow.
5. Dead α-MSH-injected animals heated at a faster rate than dead hypophysectomised animals, suggesting that local heating of the skin due to low reflectance is a major factor responsible for increased subcutaneous blood flow during heating.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: UQ Centre for Clinical Research Publications
 
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