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

Table 6

Pearson correlation coefficients for candidate variables at 18,240 random locations used to model resource selection by Sierra Nevada bighorn sheep, Sierra Nevada, California, USA, 2002–2007. Absolute value of denoted by bold type.

Variable	1	2	3	4	5	6	7	8	9	10	11	12	13	14
Biotic and remotely sensed variables
(1) KLRISK	—
(2) LNRISK	0.59	—
(3) NDSI	−0.33	−0.44	—
(4) ROCK	0.09	0.07	−0.04	—
(5) TRESH	−0.08	−0.19	0.09	−0.08	—
Topographic variables
(6) ELEV	−0.46	−0.73	0.57	−0.04	0.14	—
(7) SLOPE	0.04	−0.14	0.11	0.11	−0.02	0.34	—
(8) PRR	0.02	0.07	−0.15	−0.02	−0.06	−0.06	−0.19	—
(9) RUG20	0.05	−0.04	0.05	0.05	−0.03	0.17	0.37	−0.11	—
(10) RUG100	0.03	−0.11	0.12	0.08	−0.06	0.29	0.55	−0.15	0.49	—
(11) RUG150	0.02	−0.12	0.13	0.08	−0.06	0.29	0.53	−0.14	0.44	0.87	—
(12) CVX15	−0.01	0.03	−0.03	−0.02	0.01	−0.05	−0.20	0.12	−0.18	−0.15	−0.13	—
(13) CVX100	0.00	0.05	−0.05	−0.02	0.02	−0.07	−0.15	0.10	−0.11	−0.18	−0.20	0.17	—
(14) CVX150	0.02	0.04	−0.05	0.00	0.01	−0.03	−0.07	0.08	−0.05	−0.11	−0.15	0.11	0.79	—

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).