Abstract
In the Arava Rift Valley of Israel and in the Negev Desert, the fat jird Meriones crassus, is exposed to an extreme cold climate which can sometimes be wet during winter, while in summer it is exposed to a warm and dry climate. It is reasonable to assume that due to such seasonal climatic changes, the fat jird will show seasonal acclimatization in thermoregulatory mechanisms as well as in energy demands. In this research the thermoregulatory and energy response to changes in photoperiod regimes was studied and an attempt was made to correlate the changes in these parameters with those of circadian rhythms of body temperature measured in both photoperiod regimes.
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