. The Canadian field-naturalist. j^^l Sfaelterwoodharvest Mixed pioe-bardwood forest I I Grecnbelt Riparian hard^voods II Pasture ^1 Steep pine-hardwood forest Figure L Home range, core activity area, and available area contours for a single adult female Southern Flying Squirrel on study area IV in 1995. The con- tour data were computed in the KERNELHR home range program, then input into GRASS, where maps of habitats had been digitized from aerial photos. Fixed kernel 95% home range and core contours are shown, calculated using least squares cross valida- tion procedures for selection of the s
. The Canadian field-naturalist. j^^l Sfaelterwoodharvest Mixed pioe-bardwood forest I I Grecnbelt Riparian hard^voods II Pasture ^1 Steep pine-hardwood forest Figure L Home range, core activity area, and available area contours for a single adult female Southern Flying Squirrel on study area IV in 1995. The con- tour data were computed in the KERNELHR home range program, then input into GRASS, where maps of habitats had been digitized from aerial photos. Fixed kernel 95% home range and core contours are shown, calculated using least squares cross valida- tion procedures for selection of the smoothing para- meter "h", and limiting "h" to the range (as suggested by Seaman 1993). The 99% contour was computed from the same location data set, selecting the 99% level and using the "reference" smoothing parameter optimized by the program KERNELHR for bivariate normal data; it is used as an estimation of the habitats available for the placement of the home range. this study. We limited the program's selection range for "h" to times the reference value, as sug- gested by Seaman (1993). We follow Burt's (1940) definition of home range as "that area traversed by the individual during its normal activities of food gathering, mating, and caring for young . . ." As computed by the program KERNELHR, home ranges in this study comprise the smallest area con- taining 95% of the utilization distribution, as sug- gested by Seaman and Powell (1996). The core activity area computed by BCERNELHR is that area enclosed by a contour within which locations are closer together than would be expected under the assumption of a uniform use of the home range area (Worton 1987), commonly from 60-75% of the uti- lization distribution. Previous studies of habitat selection have present- ed what sometimes seem to be rather arbitrary and inconsistent methods for estimating available areas for habitat selection analyses (Neu et al. 197
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