Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/22723
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Type: Journal article
Title: Circadian rhythm of behavioral thermoregulation in the sleepy lizard (Tiliqua rugosa)
Author: Ellis, D.
Firth, B.
Belan, I.
Citation: Herpetologica, 2006; 62(3):259-265
Publisher: Herpetologists League
Issue Date: 2006
ISSN: 0018-0831
1938-5099
Statement of
Responsibility: 
David J. Ellis, Bruce T. Firth, Ingrid Belan
Abstract: The daily rhythm of behavioral thermoregulation in sleepy lizards (Tiliqua rugosa) was studied in laboratory thermal gradients under a 12L∶12D photoperiod in autumn and spring. In both seasons, lizards showed distinctive daily rhythms of behavioral thermoregulation, selecting their highest body temperatures during the late photophase and lowest ones during the late scotophase or early photophase. When lizards were subjected to a period of constant darkness at both seasons, this rhythm persisted and free-ran with a period of 24.7 h, indicating that it is an endogenous circadian rhythm. Furthermore, the expression of this circadian rhythm varies seasonally in the amplitude of its free-running rhythm and in the phase at which the minimum Tb is selected during 12L∶12D. The seasonal variation in the expression of the circadian rhythm of behavioural thermoregulation in Tiliqua rugosa lizards is likely to reflect seasonal changes in the neural regulation of this rhythm.
Keywords: Pineal; Lizards; Behavioral thermoregulation; Melatonin; Tiliqua rugosa; Circadian rhythm; Seasonality
Description: Copyright © 2006 The Herpetologists' League
RMID: 0020061598
DOI: 10.1655/0018-0831(2006)62[259:CROBTI]2.0.CO;2
Appears in Collections:Anatomical Sciences publications

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