Resource Selection by an Endangered Ungulate: A Test of Predator-Induced Range Abandonment

Table 3

Comparison of resource selection models incorporating risk surface from active mountain lions (LNRISK) with models substituting the correlated predictor elevation (ELEV), for female and male Sierra Nevada bighorn sheep, Sierra Nevada, California, USA, 2002–2007. Substituted variables denoted by bold type.

Model
Female
CVX15 CVX150 LNRISK NDSI PRR ROCK RUG30 RUG150 SLOPE	7147.0	0.0
CVX15 CVX150 ELEV NDSI PRR ROCK RUG30 RUG150 SLOPE	7220.7	73.7
Male
CVX100 LNRISK PRR ROCK RUG20 RUG100 SLOPE TRESH	3296.9	0.0
CVX100 ELEV PRR ROCK RUG20 RUG100 SLOPE TRESH	3421.0	124.1

Note. Variables in RSF models for winter habitat selection by bighorn sheep included convexity over radii of 15 m (CVX15), 100 m (CVX100), and 150 m (CVX150); risk surface from locations of active mountain lions (LNRISK); normalized difference snow index (NDSI); potential relative radiation (PRR); rock cover (ROCK); terrain ruggedness over radii of 20 m (RUG20), 30 m (RUG30), 100 m (RUG100), and 150 m (RUG150); slope (degrees; SLOPE); and tree-shrub cover (TRESH).