. The Canadian field-naturalist. Natural history. 2002 Pyare, Smith, Nicholls, and Cook: Dets of Flying Squirrels in Alaska 101 100- 0) o c 2 3 O U O. â Alaska n Non- Alaska /^ ^^ ^^^ o^^"^ Food Type Figure 2. Comparison of food-item occurrence in pooled samples between southeast Alaska (n = 10 stands) and outside Alaska (9). Insect frequencies were not reported in most studies and therefore left out of this comparison. All samples were collected in mature conifer-forest habitat during snow-free peri- ods. Bars represent standard error. Non-Alaska data from: Cazares et al. 1999; Hall 1991
. The Canadian field-naturalist. Natural history. 2002 Pyare, Smith, Nicholls, and Cook: Dets of Flying Squirrels in Alaska 101 100- 0) o c 2 3 O U O. â Alaska n Non- Alaska /^ ^^ ^^^ o^^"^ Food Type Figure 2. Comparison of food-item occurrence in pooled samples between southeast Alaska (n = 10 stands) and outside Alaska (9). Insect frequencies were not reported in most studies and therefore left out of this comparison. All samples were collected in mature conifer-forest habitat during snow-free peri- ods. Bars represent standard error. Non-Alaska data from: Cazares et al. 1999; Hall 1991; Maser et al. 1985; Maser et al. 1986; McKeever 1960; Pyare and Longland 2001; Rosentreter et al. 1997; and Waters and Zabel 1995. The frequency of lichen in samples was roughly simi- lar between muskeg and old-growth sites (20 ± and 27 ± , respectively). Five truffle genera were present in old-growth samples. Elaphomyces was the only truffle genus present in muskeg samples. Examination of spring and autumn fecal-analysis data from 11 other forest sites throughout the western United States revealed that overall, the frequency of truffles in fecal samples from southeast Alaska was comparatively low (Table 2; Figure 2). In contrast, the frequencies of lichens, vascular plants, and epi- geous fungi were higher in Southeast Alaska than in the contiguous western United States, although these differences were not significant (Figure 2). Although sample size had a strong influence on the number of truffle genera present in samples collected throughout the western contiguous United States (Figure 3), Southeast Alaska appears to be atypical and does not fit this general correlation. Taxonomic richness of Alaska diets was much lower than other- wise would have been predicted (roughly 22 genera) for the observed Alaska sample size (n = 151; old- growth habitat only). On average, individual squirrel samples from Alaska contained fewer genera than samples from California an
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