Меchanisms of Hibernation and Cold-Resistance of Winter-Hibernating Sciuridae of Yakutia

Аnufriev А.I.

The report presents a study of hibernation mechanisms in Sqiuridae family in Yakutia in conditions of the natural temperature. The next three points are considered: the rhythm of winter hibernation and mechanisms of its forming; the intensity of metabolism and mechanisms of its regulation; winter hibernation of Squiridae in Yakutia with body temperature below zero degrees Celsius. A winter hibernation of winter-hibernating Sciuridae of Yakutian consists of successive intervals of normothermia and hypothermia. Unlike the relative species living in warmer climate they have longer hibernating period and longer maximum length of the stupor duration. In a state of hypothermia, metabolism is reduced in 80-100 times in chipmunks, 100 - 130 times in gophers and 30-50 times in marmot. The temperature dependence of metabolism is present. The black-capped marmot and two gopher species have minimum metabolism level in the range of near zero temperatures. The chipmunk has it slightly higher. Black-capped marmot, Long-tailed and Arctic ground squirrels are capable to be in hibernation with a body temperature below zero, the ground squirrels - to 2 below zero and Black-capped marmot to 1 below zero degrees Celsius.

Key words: hibernation, gophers, groundhogs, chipmunks, thermal control, body temperature, hibernation rhythms.

Science and Education, 2015, No.1, pp.109-119