Changes in heart rate are important for thermoregulation in the varanid lizard Varanus varius

Seebacher, F. and Grigg, G. C. (2001) Changes in heart rate are important for thermoregulation in the varanid lizard Varanus varius. Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology, 171 5: 395-400. doi:10.1007/s003600100188

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Author Seebacher, F.
Grigg, G. C.
Title Changes in heart rate are important for thermoregulation in the varanid lizard Varanus varius
Journal name Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology   Check publisher's open access policy
ISSN 0174-1578
1432-136X
Publication date 2001-01-01
Sub-type Article (original research)
DOI 10.1007/s003600100188
Open Access Status File (Author Post-print)
Volume 171
Issue 5
Start page 395
End page 400
Total pages 6
Editor I. D Hume
L. C. Wang
Place of publication Berlin, Germany
Publisher Springer International
Language eng
Subject 06 Biological Sciences
060603 Animal Physiology - Systems
0606 Physiology
Abstract Laboratory studies and a single field study have shown that heart rate in some reptiles is faster during heating than during cooling at any given body temperature. This phenomenon, which has been shown to reflect changes in peripheral blood flow, is shown here to occur in the lizard Varanus varius (lace monitor) in the wild. On a typical clear day, lizards emerged from their shelters in the morning to warm in the sun. Following this, animals were active, moving until they again entered a shelter in the evening. During their period of activity, body temperature was 34-36 degrees C in all six study animals (4.0-5.6 kg), but the animals rarely shuttled between sun and shade exposure. Heart rate during the morning heating period was significantly faster than during the evening cooling period. However, the ratio of heating to cooling heart rate decreased with increasing body temperature, being close to 2 at body temperatures of 22-24 degrees C and decreasing to 1.2-1.3 at body temperatures of 34-36 degrees C. There was a significant decrease in thermal time constants with increasing heart rate during heating and cooling confirming that changes in heart rate are linked to rates of heat exchange.
Keyword heart rate
body temperature
thermoregulation
lizards
heat transfer
Q-Index Code C1
Additional Notes Originally published as Seebacher, F. and Grigg, G. C. (2001) Changes in Heart Rate are Important for Thermoregulation in the Varanid Lizard Varanus varius. Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology 171(5):395-400. Copyright 2001 Springer-Verlag. All rights reserved. The original article is available online at www.springerlink.com

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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