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- W594745870 abstract "As the residential and recreational development in western Kittitas County increases, as well as interstate travel and commerce, the need arises to expand the interstate highway system to accommodate the increase in traffic volume. This increased traffic and expansion of transportation routes may potentially affect wildlife movements and traffic safety. To identify areas for potential wildlife corridors along Interstate-90 (I-90) and state highways (SR), we analyzed cougar movements and 95% fixed kernel home range estimates from Global Positioning System (GPS) collar locations of collared cougars on a 3,657 sq km area of western Kittitas County, Washington from 2001-2004. A logistic regression model for both winter and summer was developed to determine relative probability of use by cougars for topographic and land cover characteristics. We found cougars (n=11) used a mean elevation of 786 +/- 166 m in winter and 971 +/- 256 m in summer. We used t-tests and selection ratios (S) to compare differences in cougar use locations versus random locations from Geographic Information Systems (GIS). In winter cougars selected for lower elevations (S=0.71), milder slopes (S=0.82), open (S=1.34) or closed (S=1.08) canopy forest types, and south facing slopes (S=1.19). They selected against agricultural (S=0.43), rangeland (S=0.16), cities/roads (S=0.93), water (S=0.17), rock (S=0.26), north (S=0.81), and west (S=0.87) slopes. During summer, cougars selected for steeper slopes (S=1.05), open (S=1.12) and closed (S=1.27) canopy forest types on north (S=1.15), west (S=1.06) or east (S=1.06) facing slopes. They selected against agriculture (S=0.43), rangeland (S=0.07), cities/roads (S=0.46), water (S=0.25) and rock (S=0.37). From these results, we determined significant variables (P<0.05) for inclusion in a logistic regression model of vegetation and physiographic variables associated with cougar GPS locations. Logistic regression indicated cougars selected for open and closed canopy forest and selected against agriculture, rangeland, water, and cities/roads during winter. They selected for lower elevations with south facing slopes and selected against north, west and east facing slopes or flat terrain. During the summer cougars were not as selective, but preferred open and closed canopy forest on north, west or east facing slopes. We found resident females (n=3) occupied home ranges adjacent to I-90, however they did not to cross the interstate. One resident male established a home range encompassing I-90. Sub-adult females (n=2) and sub-adult males (n=2) were documented crossing I-90 and dispersing from the study area. The two lane SR 903, 970, 97, and 10 appeared permeable to cougar movements as male and female cougars established home ranges encompassing these SRs. Crossing along I-90 and SRs tended to occur in areas forested to the highway edge on both sides and along ridgelines or riparian areas." @default.
- W594745870 created "2016-06-24" @default.
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- W594745870 date "2005-06-30" @default.
- W594745870 modified "2023-09-24" @default.
- W594745870 title "Identifying I-90 Wildlife Corridors Using GIS & GPS: Spatial-Temporal Model of Landscape Use by GPS Marked Cougars" @default.
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