. The Canadian field-naturalist. Natural history; Sciences naturelles. 2006 Kitchen, Gese, and Lupis: Di:n She Selection by Swiff Foxes 33. Current distribution Historic distribution Study site (PCMS) Figure 1. Swift Fox current and historic range and study area, Pinon Canyon Maneuver Site. Colorado. 2000. Den Site Selection To examine den site selection, we compared micro- habitat characteristics of dens to control sites that rep- resented available sites (Taylor et al. 1999). For each of the active den sites, we randomly selected one control site (not a den) within the Swift Foxes home range
. The Canadian field-naturalist. Natural history; Sciences naturelles. 2006 Kitchen, Gese, and Lupis: Di:n She Selection by Swiff Foxes 33. Current distribution Historic distribution Study site (PCMS) Figure 1. Swift Fox current and historic range and study area, Pinon Canyon Maneuver Site. Colorado. 2000. Den Site Selection To examine den site selection, we compared micro- habitat characteristics of dens to control sites that rep- resented available sites (Taylor et al. 1999). For each of the active den sites, we randomly selected one control site (not a den) within the Swift Foxes home range. We used the control site to compare the site characteristics of active den sites versus random sites within the Swift Foxes' home range. The control site was located 500 m away from the active den site in a random direction. This distance was arbitrary but allowed for selection of a random location within the home range. Because control sites were in the home range of the Swift Fox inhabiting the active den site, they were considered available as a possible denning location to the Swift Fox. The same den site characteristics were evaluated on the control sites, excluding variables associated with den entrances. Den Placement Dens used by Swift Foxes during the breeding sea- son were recorded using telemetry procedures to assess the placement and use of the dens within the home range. The Swift Foxes" home ranges were described using a 95 % fixed kernel home-range estimator based on > 30 locations recorded within the breeding sea- son (Worton 1989) with Arc view software (Envi- ronmental Systems Research Institute. Redlands, California). Areas within the home range were then defined as the core area, which was the area within the 50% isopleth. the mid-range area, between the 50% and 75% isopleths, and the boundan, area, between the 75% and the 957f isopleths. The number of dens and the frequency of use of those dens in the core, mid- range, and boundary areas
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