Entrainment of activity rhythms to temperature cycles in diurnal palm squirrels

Physiology & Behavior
S M Rajaratnam, J R Redman

Abstract

Ambient temperature cycles entrain circadian rhythms of homeotherms. The phase that entrainment occurs at varies, particularly in diurnal species. We investigated whether ambient temperature cycles of 12 h warm (34 to 40 degrees C) and 12 h cool (24 to 28 degrees C) entrained locomotor activity rhythms of diurnal Indian palm squirrels (Funambulus pennanti) that were free-running in constant dim light (3.2 to 7.6 lux). Seven female squirrels were exposed to the temperature cycle for 21 days, after which a 5-h phase delay of the cycle was imposed. The cycle then continued for a further 50 days. Three of the seven squirrels showed entrainment to the temperature cycle. Of the three which entrained, one was warm-active and two were cool-active. Of the remaining squirrels, two showed entrainment or relative coordination of one component of the rhythm, and two did not show any entrainment. Positive and negative masking of activity by the warm and cool fractions were observed regardless of whether or not squirrels entrained. These results suggest that ambient temperature is an effective zeitgeber for F. pennanti. As has been reported for other diurnal species, interindividual differences exist in the phase of entrainment to temperature...Continue Reading

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Citations

Dec 10, 2003·Current Opinion in Neurobiology·Alec J Davidson, Michael Menaker
May 1, 1999·Physiology & Behavior·S M Rajaratnam, J R Redman
Jun 15, 2011·Trends in Neurosciences·Jennifer A Mohawk, Joseph S Takahashi
Aug 4, 2010·Journal of Biological Rhythms·Roberto Refinetti
Feb 13, 2009·Chronobiology International·Jose Fernando López-Olmeda, Francisco Javier Sánchez-Vázquez
Jun 9, 2010·Chronobiology International·Pablo VivancoJuan Antonio Madrid
Apr 11, 2009·Chronobiology International·Joseph J Knadler, Terry L Page
Mar 15, 2001·Chronobiology International·S M Rajaratnam, J R Redman
May 16, 2009·Chronobiology International·Sangeeta RaniVinod Kumar
Mar 15, 2013·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Khalid El AllaliPaul Pévet
Oct 13, 2020·Chronobiology International·Dhanananajay KumarMuniyandi Singaravel
Dec 1, 2020·Temperature : Multidisciplinary Biomedical Journal·Roberto Refinetti

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