Température corporelle et niveau métabolique des marmottes en hibernation (Marmota camtschatica). Body temperature and metabolism level in hibernating marmots (Marmota camtschatica Pallas, 1811).

Résumé

In experimental conditions the body temperature of hibernating marmots was always below + 5. 0° The temperature of front body part fluctuated from 1.8 to 5.5° C and the rectal temperature was 0.9-3.5° C. The body temperature increasing during arousal is irregular. Rectal temperature began to increase when the intersloulder blade temperature reached 27-28°C. The body temperature decreasing during entrance into hibernation proceeded now slowly, now rapidly for approximately 24 hours. Average daily and annual energy expenditures in juveniles were lower than in year-old and adult animals. It is known that marmots hibernate together. In our experiments, the energy expenditures in single individual independently of sex and age and at the same ambient temperature were higher than in group from 4 animals. If the body mass reduction in a single marmot was 46, 26-50, 37%, the animals keeping in group reduced their body mass only by 24, 34-34. 09%.