. The Canadian field-naturalist. 276 The Canadian Field-Naturalist Vol. 91 Table 1—Capture, position, and home range data for Peromyscus leucopus tracked with radiotelemetry Number Number Total Number Home trap Number radio number days range captures traps positions positions tracked (acres)' Males (N = 9) Mean SD Range Females (N = 6) Mean SD Range 3-13 1-3 UI4 12-20 1-8 2-15 1-5 1-11 3-24 1-7 'The home range calculations for the females are based on N = 5; one female was
. The Canadian field-naturalist. 276 The Canadian Field-Naturalist Vol. 91 Table 1—Capture, position, and home range data for Peromyscus leucopus tracked with radiotelemetry Number Number Total Number Home trap Number radio number days range captures traps positions positions tracked (acres)' Males (N = 9) Mean SD Range Females (N = 6) Mean SD Range 3-13 1-3 UI4 12-20 1-8 2-15 1-5 1-11 3-24 1-7 'The home range calculations for the females are based on N = 5; one female was omitted from the calculations because of inadequate data. Population Structure The density of the resident population was individuals/ha ( mice/acre). Three different age class modes were observed, one averaging 13 g representing juveniles about 4 weeks of age, a second averaging 16 g repre- senting subadults about 7 weeks of age, and a third around 23 g representing sexually mature adults of a wide age spectrum (Figure 1). The sex ratio for the resident immature mice was approximately 1:1 (8 males, 9 females). The ratio for the adult residents was similar (17 males, 15 females). Transient status was recorded for 2 of 13 juveniles, 8 of 14 subadults, and 4 of 36 adults. The two mice at 14 g were divided among the juvenile and subadult age groups because of unclear group affiliation. The hypothesis of no difference in the relative numbers of resident and transient mice among the juvenile and subadult age groups is rejected {P- ), as is the null hypothesis relative to the subadult and adult age groups (P< ). The null hypothesis relative to the juvenile and adult age groups, however, is not rejected. These results indicate more transient mice, and hence a greater degree of either dispersal or death, in the subadult age class. Habitat Use Refuge use (rock piles, groundhog burrows) at. 15 20 25 Average weight (gms) Figure 1. Weight frequency distribution of all
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