The variables of physical habitat selection by the desert bighorn sheep (Ovis canadensis weemsi) in the Sierra del Mechudo, Baja California Sur, Mexico

Selection of physical habitat variables by desert bighorn sheep Ovis canade nsis weemsi in the Sierra del Mechudo, Baja California Sur is analysed. Sea sonal differences among sex and age classes were found. Sheep are mainly in mountain slopes and canyon slopes ( > 80%) with SE and N orientation, chan ging along the day and season. The elevation is 100-400 m a.s.l. and the di stance to escape terrain < 200 m. Segregation of rams occurs outside the ru t, with ram selecting different habitat variables during lambing, winter an d spring. The prefered waterholes are near escape terrain with poor vegetal cover and good visibility. (C) 2001 Academic Press.