Daily rhythms of metabolic rate and body temperature of two murids from extremely different habitats

Ami Rubal, Itzhak Choshniak, Abraham Haim

Research output: Contribution to journalArticlepeer-review

Abstract

Daily circadian rhythms of body temperature (Tb) and oxygen consumption (VO2) were measured in two murid species, which occupy extremely different habitats in Israel. The golden spiny mouse (Acomys mssalus) is a diurnal murid distributed in arid and hot parts of the great Syrio-African Rift Valley, while the broad-toothed field mouse (Apodeinns mystacinus) is a nocturnal species that inhabits the Mediterranean woodlands. In both species, the daily rhythms of Tb and VO2 are entrained by the photoperiod. Under laboratory experimental conditions (ambient temperature Ta = 33oC and photoperiod regime of 12L: 12D), Acomys russatus exhibits a tendency towards a nocturnal activity pattern, compared to the diurnal activity displayed by this species under natural conditions. Under the same photoperiod regime and at Ta = 28oC, Apodemus mystacinus displays nocturnal activity, as observed under natural conditions. The maximal values of Tb were recorded in Acomys russatus at midnight (23:50 h), while the maximal values of VO2 were recorded at the beginning of the dark period (18:20 h). In Apodemus mystacinus, the maximal values of Tb and VO2 were recorded at 23:40 and 20:00 h, respectively. The ecophysiological significance of these results is discussed further.

Original languageEnglish
Pages (from-to)341-349
Number of pages9
JournalChronobiology International
Volume9
Issue number5
DOIs
StatePublished - 1992
Externally publishedYes

Keywords

  • Daily rhythm
  • Metabolic rate
  • Photoperiod
  • Rodents
  • Thermoregulation

ASJC Scopus subject areas

  • Physiology (medical)
  • Physiology

Fingerprint

Dive into the research topics of 'Daily rhythms of metabolic rate and body temperature of two murids from extremely different habitats'. Together they form a unique fingerprint.

Cite this