A study of the diurnal activity of the Belding Ground Squirrel and the Yellow-Bellied Marmot with particular reference to light and temperature

Periodically among animals is but single phase of community organization. As a result of this cyclic behavior more complete utilization of the habitat space and radiant energy within a community is possible. Each community is characterized by a diel pattern of activity divided into two complementary portions (day and night), each of which contains an active and inactive fauna. It is the purpose of this study to investigate the diurnal periodicity of the Belding Ground Squirrel (Citellus beldingi, Fig. 3), and the Yellow bellied Marmot (Marmota flaviventris, Fig. 5). And to correlate the physical factors of light intensity and temperature to these activity patterns inasmuch as it seemed justified with inadequate data available. Study began on the twenty-first of June, 1951 and continued through the month of July of the same year.