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Results: The sites with greater availability of escape terrain were more frequently selected by herds of ewes and yearlings (χ² = 9.83, P < 0.05), while herds of mixed adults selected sites having less escape terrain. During the dry season, sheep selected sites had low vegetation cover (χ² = 11.58, P < 0.05). During the rainy season, sheep selected greater vegetation cover at only one of the study sites (χ² = 8.72, P < 0.05). During the post-rainfall season, we found no relationship between vegetation cover and presence of sheep. Discussion and conclusions: Selection of escape terrain and vegetation cover seems to be related to the sheep’s anti-predatory strategy. More females (n = 140) and yearlings (n = 62) occurred where continuous habitat and permanent water was available, which confirms the importance of the Sierra Santa Isabel for breeding and recruitment of bighorn sheep in the Baja California Peninsula. The vegetation index derived from satellite imagery measured only the phenological stage of the plant community, but did not indicate which plant species are present and used by the sheep. However, the index facilitates locating areas with high availability of food and defining sampling areas to monitor populations and carry out censuses.

therya

Selección del terreno de escape y cobertura vegetal del borrego cimarrón (Ovis canadensis cremnobates) en Baja California, mediante Técnicas de Teledetección Satelital