Metabolism and thermoregulation in the Levant vole Microtus guentheri: The role of photoperiodicity

Daniel Banin, Abraham Haim, Zeev Arad

Research output: Contribution to journalArticlepeer-review

Abstract

1. 1. The populations of the Levant vole, Microtus guentheri, inhabiting the Mediterranean ecosystem of Israel, are marginal populations which seem to be well adapted to its long dry and warm season. The thermoregulatory and metabolic responses of the Levant voles of Israel to manipulation of photoperiod were studied to assess to role of photoperiodicity in seasonal acclimatization. 2. 2. Resting metabolic rate (RMR) and body temperature at various ambient temperatures, overall thermal conductance, nonshivering thermogenesis, gross energy and digestible energy intake were measured in voles acclimated to long scotophase (8L:16D) and long photophase (16L:8D) at a constant ambient temperature of 25±1°C. 3. 3. This study revealed that acclimation to a long photophase resulted in a decreased RMR and minimal thermal conductance, but in a higher upper critical point of the thermoneutral zone, as well as higher gross energy and digestible energy intakes and in a higher body mass. 4. 4. Therefore, we suggest that an increased photophase is an important environmental cue for summer acclimatization of the metabolic and thermoregulatory systems in the Levant vole.

Original languageEnglish
Pages (from-to)55-62
Number of pages8
JournalJournal of Thermal Biology
Volume19
Issue number1
DOIs
StatePublished - Feb 1994
Externally publishedYes

Keywords

  • Microtus guentheri
  • Rodent
  • digestible energy intake
  • gross energy intake
  • nonshivering thermogenesis
  • overall thermal conductance
  • photoperiodicity
  • resting metabolic rate
  • seasonal acclimatization
  • thermoregulation
  • vole

ASJC Scopus subject areas

  • General Agricultural and Biological Sciences
  • Physiology
  • Biochemistry
  • Developmental Biology

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