Entrainment of circadian rhythms of locomotor activity by ambient temperature cycles in the dromedary camel.

ABSTRACT: In the dromedary camel, a well-adapted desert mammal, daily ambient temperature (T_a)-cycles have been shown to synchronize the central circadian clock. Such entrainment has been demonstrated by examining two circadian outputs, body temperature and melatonin rhythms. Locomotor activity (LA), another circadian output not yet investigated in the camel, may provide further information on such specific entrainment. To verify if daily LA is an endogenous rhythm and whether the desert T_a-cycle can entrain it, six dromedaries were first kept under total darkness and constant-T_a. Results showed that the LA rhythm free runs with a period of 24.8-24.9 h. After having verified that the light-dark cycle synchronizes LA, camels were subjected to a T_a-cycle wit

SUBMITTER: Farsi H 

PROVIDER: S-EPMC7658228 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature