Seasonality and seasons out of time - The thermoregulatory effects of light interference

Abraham Haim, Uri Shanas, Abed El Salam Zubidad, Michael Scantelbury

Research output: Contribution to journalArticlepeer-review


The change in photoperiod is the main environmental cue for seasonal function of the reproductive, thermoregulatory, and immune systems in rodents existing outside of the tropics. In Israel, the social vole Microtus socialis breeds mainly under short photoperiod (SP) conditions. Previous studies showed that exposing voles to light interference (LI) in the field during the winter resulted in death. The aim of the current study was to determine the thermoregulatory response of SP-acclimated voles to LI. Therefore, heat production (VO2) at different ambient temperatures (Ta) and nonshivering thermogenesis (NST) were measured. Results show that LI of 15 min every 4 h during the dark period significantly (p < 0.02) decreased VO2 at Ta = 15°C and significantly (p < 0.05) decreased NST-capacity. These results can at least partly explain why LI-voles died during the winter under field conditions, through eliminating winter acclimatization of the thermoregulatory system, or what is considered as "seasons out of time."

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalChronobiology International
Issue number1
StatePublished - 2005
Externally publishedYes


  • Heat Production
  • Non-shivering Thermogenesis
  • Photophase
  • Seasonality
  • Thermal Conductance
  • Thermoregulations
  • Voles

ASJC Scopus subject areas

  • Physiology (medical)
  • Physiology


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