PMID: 7488762Sep 1, 1995

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

Journal of Biological Rhythms
G Tosini, M Menaker


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


May 8, 1978·Journal of Theoretical Biology·P G Sokolove, W N Bushell
Mar 1, 1992·Physiology & Behavior·R Refinetti, M Menaker
Jan 1, 1990·Comparative Biochemistry and Physiology. A, Comparative Physiology·A E MuchlinskiR J Stoutenburgh
Mar 1, 1973·Physiology & Behavior·J Aschoff, U von Saint-Paul
May 1, 1974·Psychosomatic Medicine·R Lund
Aug 15, 1967·The Japanese Journal of Physiology·J AschoffR Wever
May 1, 1984·Physiology & Behavior·G E PickardR Silver
Aug 1, 1994·Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology·R RefinettiM Menaker


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

Trending Feeds


Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Neural Activity: Imaging

Imaging of neural activity in vivo has developed rapidly recently with the advancement of fluorescence microscopy, including new applications using miniaturized microscopes (miniscopes). This feed follows the progress in this growing field.

The Tendon Seed Network

Tendons are rich in the extracellular matrix and are abundant throughout the body providing essential roles including structure and mobility. The transcriptome of tendons is being compiled to understand the micro-anatomical functioning of tendons. Discover the latest research pertaining to the Tendon Seed Network here.

Myocardial Stunning

Myocardial stunning is a mechanical dysfunction that persists after reperfusion of previously ischemic tissue in the absence of irreversible damage including myocardial necrosis. Here is the latest research.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.


Incretins are metabolic hormones that stimulate a decrease in glucose levels in the blood and they have been implicated in glycemic regulation in the remission phase of type 1 diabetes. Here is the latest research.

Chromatin Regulation and Circadian Clocks

The circadian clock plays an important role in regulating transcriptional dynamics through changes in chromatin folding and remodelling. Discover the latest research on Chromatin Regulation and Circadian Clocks here.

Long COVID-19

“Long Covid-19” describes illness in patients who are reporting long-lasting effects of the SARS-CoV-19 infection, often long after they have recovered from acute Covid-19. Ongoing health issues often reported include low exercise tolerance and breathing difficulties, chronic tiredness, and mental health problems such as post-traumatic stress disorder and depression. This feed follows the latest research into Long Covid.

Spatio-Temporal Regulation of DNA Repair

DNA repair is a complex process regulated by several different classes of enzymes, including ligases, endonucleases, and polymerases. This feed focuses on the spatial and temporal regulation that accompanies DNA damage signaling and repair enzymes and processes.