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sur le développement des zones arides et semi-arides

Titre : Análisis del uso-selección de habitat del borrego cimarrón (Ovis canadensis cremnobates) en Baja California, mediante técnicas de teledetección satelital.

Auteur : Escobar Flores, Jonathan Gabriel

Etablissement de soutenance : Centro de Investigaciones Biológicas del Noroeste (CIBNOR)

Grade : Doctorado en Ciencias en el Uso, Manejo y Preservación de los Recursos Naturales 2016

Résumé
The assessment bighorn habitat is essential to determine the distribution and the number of individuals who can support an area. In this research satellite remote sensing techniques were used to analyse availability, use and habitat selection carried out by the bighorn sheep in Sierra Santa Isabel. The study used three essential components : water, escape terrain and cover vegetation. Of the 11 water holes that are used by bighorn sheep, Zamora (n = 120) and El Cordero (n = 67) had the highest records were identified. Sites with greater availability of escape terrain were selected by groups of ewes and yearlings (χ² = 9.83, P ˂ 0.05), while groups of adults (rams and ewes) selected sites with lower availability. In dry season bighorn sheep selected sites with low vegetation cover (χ² = 11.58, P < 0.05), and during the rainy season in only one of the study sites selected sites with greater coverage (χ² = 8.72, P < 0.05). For the period post-rainfall no relationship between vegetation cover and distribution of bighorn sheep was found. Site selection of escape terrain and vegetation cover by bighorn sheep was correlated with its anti predatory strategy. The greatest record of ewes (n = 140) and yearlings (n = 62), coupled with the unfragmented habitat and availability of permanent water, confirm the importance of Sierra Santa Isabel for breeding, raising and recruitment of bighorn sheep in Baja California. The analysis of satellite images facilitate location and allow optimal evaluation, essential for monitoring and management of populations of bighorn sheep habitat.

Mots Clés : Teledetección ; NDVI ; Indice de Rugosidad ; Ovis canadensis ; evaluación ; selección de hábitat

Présentation

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