. Bulletin. Science; Natural history; Natural history. 1975 SEASONAL CYCLES IN BELDING GROUND SQUIRRELS 135 450. 10 20 Aug Figure 6. Annual variation in cycle of body weights in adult male Spcrmopliiliis beldingi hctdinpi at Tioga Pass. Numerals indicate sample size. 10 20 Sept lusher than on the higher meadow, but it did not contain as many Kcal per unit weight. The actual food .selected by S. h. helilini^i, as seen in stomach contents, indicates that they are probably opportunistic feeders. Early in the sea- son green grass was the most important item in their diet at both study sites (Fig.
. Bulletin. Science; Natural history; Natural history. 1975 SEASONAL CYCLES IN BELDING GROUND SQUIRRELS 135 450. 10 20 Aug Figure 6. Annual variation in cycle of body weights in adult male Spcrmopliiliis beldingi hctdinpi at Tioga Pass. Numerals indicate sample size. 10 20 Sept lusher than on the higher meadow, but it did not contain as many Kcal per unit weight. The actual food .selected by S. h. helilini^i, as seen in stomach contents, indicates that they are probably opportunistic feeders. Early in the sea- son green grass was the most important item in their diet at both study sites (Fig. 9). Seeds were more important as the season progressed and Ihey became more available, especially at Tioga Increased seed consumption paralleled fattening at Tioga Pass but seeds were not eaten in qLianlily at Big Bend imtil the end of the sea- son. In both cases, in my opinion, consumption was related to availability. Arthropods, par- ticularly ants, beetles, and grasshoppers, were eaten throughout the season. Their importance as a food item may be greater than indicated in figure 9 since there were arthropod remains in 32 percent of the stomachs from Big Bend and in 45 percent of those from Tioga Pass. In the miscellaneous category were included such items as fungi, carrion, and unidcntifiahle materials. Effects of Controlled Environments on Body Weights: Squirrels were brought into the labora- tory from Tioga Pass at two times in relation to the annual cycle: soon alter emergence and at the onset of prehibernaiory fattening. In one experiment one group was held on short days (6L: 18D) and another group on long days (18L: 6D). Sexes were divided about evenly within. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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