Seasonal Changes in Body Fat, Water and Basic Weight in Citellus Lateralis, Eutamias Speciosus and E. Amoenus

Abstract

Citellus lateralis in the Sierra Nevada of California has an annual change of total body fat, characterized by a threefold increase from August to September, just prior to hibernation. Eutamias speciosus and E. amoenus have less body fat than C. lateralis, and the predormancy increase occurs in October. These 2 species of Eutamias enter dormancy during October. Just prior to winter dormancy, there is a slight drop in basic weight (fat-free, water-free body weight) and body water.