. The Canadian field-naturalist. 1989 HlRUKI AND STIRLING: ARCTIC FOX ON BANKS ISLAND 381. Figure 1. Locations of Inuit traplines used for collection of Arctic Fox specimens, 1974-78 (dotted lines), and Arctic Fox den sites (solid dots). From Usher (1971 a) and Urquhart (1973a). tion. For some foxes, trappers saved only skulls so that age and year of capture, but neither sex nor condition, were known. Condition was subjec- tively assessed on a scale of 1 to 3, thin foxes being condition 1 and fat foxes being condition 3. Canine teeth collected from the jaws of 718 Arctic Foxes were decalcified
. The Canadian field-naturalist. 1989 HlRUKI AND STIRLING: ARCTIC FOX ON BANKS ISLAND 381. Figure 1. Locations of Inuit traplines used for collection of Arctic Fox specimens, 1974-78 (dotted lines), and Arctic Fox den sites (solid dots). From Usher (1971 a) and Urquhart (1973a). tion. For some foxes, trappers saved only skulls so that age and year of capture, but neither sex nor condition, were known. Condition was subjec- tively assessed on a scale of 1 to 3, thin foxes being condition 1 and fat foxes being condition 3. Canine teeth collected from the jaws of 718 Arctic Foxes were decalcified, thin-sectioned, and examined under a light microscope (Stirling et al. 1977). Age was determined by counting annual lines in the cementum (Grue and Jensen 1976; Bradley et al. 1981). Arctic Foxes with no incremental lines (age 0+) were classified as All others (age 1 year and over) were classified as adults, since the Arctic Fox matures at 10 months of age (Macpherson 1969). The diameter of the pulp cavity of the tooth was also useful in confirming the age of animals less than one year old, because the pulp cavities of juvenile Arctic Foxes are generally much larger than those of adults (Bradley et al. 1981). All the teeth were aged soon after collection. We re-aged all adult teeth (n = 282). Any teeth with two different assigned ages were examined again by a third observer. The annual survival of juvenile and of adult Arctic Foxes were calculated from the age structure (Chapman and Robson 1960). The condition of juvenile and adult Arctic Foxes were compared using a Z-test and Chi-square test (Mendenhall et al. 1981). The proportion of males to females for each age class in the population was examined using a Chi-square test for goodness of fit to a 1:1 sex ratio. The age composition of males was compared to that of females, using a Z-test. Differences in condition between males and females were also examined using a contingency table (Mendenhall et al. 1981). All
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