PMID: 7488762Sep 1, 1995

Circadian rhythm of body temperature in an ectotherm (Iguana iguana)

Journal of Biological Rhythms
G Tosini, M Menaker

Abstract

Ectothermic animals regulate their body temperatures primarily by behavioral adjustment in relation to the thermal characteristics of the environment. Several studies have shown that some vertebrate ectotherms may show a daily pattern of body temperature selection when given a choice of environmental temperature. The pattern of body temperature selection free-runs when the animals are kept in constant darkness, demonstrating the existence of circadian regulation. To test whether there might also be a low amplitude circadian rhythm of body temperature itself, we examined the pattern of body temperature and locomotor activity of the lizard Iguana iguana held in a constant environmental temperature. Both variables were recorded for 3 days in a light:dark cycle and then for 10 days in constant dim light (0.1 lux). Under these conditions the body temperature of the lizard oscillates with a circadian period as does the locomotor behavior. These results demonstrate for the first time that ectothermic animals may display physiologically generated circadian rhythms of body temperature similar to those recorded in endotherms. In some animals the circadian rhythms of body temperature and locomotor activity showed different free-running pe...Continue Reading

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Citations

Apr 26, 2007·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·David J EllisIngrid Belan
Jul 30, 2008·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·David J EllisIngrid Belan
Jan 3, 2001·Physiology & Behavior·A P Riccio, B D Goldman
Aug 1, 1997·Physiology & Behavior·R Refinetti, S J Susalka
Jan 7, 1999·Physiology & Behavior·P J DecourseyJ Schull
Feb 23, 2007·Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians·Shannon T FerrellNancy P Lung
Jan 1, 2002·The Arabidopsis Book·C Robertson McClungTodd P Michael
Sep 5, 2006·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Kênia C BicegoLuiz G S Branco
May 12, 2006·Chronobiology International·A FoàC Bertolucci
Feb 18, 2004·Journal of Biological Rhythms·Paul A BartellM Menaker
Mar 1, 1997·Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Médicas E Biológicas·M MenakerG Tosini
May 31, 2017·ELife·Swathi Yadlapalli, Orie T Shafer
Dec 24, 1997·Journal of Biological Rhythms·M Menaker

Related Concepts

Circadian Rhythms
Iguanas
Telemetry

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