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

Figure 3

Representative subset of winter habitat for Sierra Nevada bighorn sheep, illustrated by view of Wheeler Ridge from NAIP 2009 aerial image, indicating high elevation (>3,000 m) and low elevation (<2,000 m) habitat. Snow cover and locations of bighorn sheep and mountain lions shown for: (a) drought years 2002–2004, 2007 ( = 1,730 daily locations of bighorn sheep; = 1,308 locations of active mountain lions), with snow cover (NDSI) derived from 12 April 2002 TM image: and (b) above-average precipitation years 2005 and 2006, ( daily locations of bighorn sheep; = 1,055 locations of active mountain lions), with snow cover (NDSI) derived from 12 April 2005 TM image. Sierra Nevada, California, USA. Natural color base map is resampled from 1-m native resolution to 10-m pixel size corresponding to horizontal resolution of 10-m DEM used for 3D visualization. Natural , , and dimensions preserved (i.e., no stretch is applied to emphasize relief). NDSI from TM image (Path 42, Row 34).

(a)

(b)