Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Mexique → Diagnóstico del hábitat del borrego cimarrón (Ovis canadensis weemsi) en función de variables ambientales y actividades antropogénicas en la Sierra el Mechudo, Baja California Sur, México

Centro de Investigaciones Biológicas del Noroeste (CIBNOR) 2013

Diagnóstico del hábitat del borrego cimarrón (Ovis canadensis weemsi) en función de variables ambientales y actividades antropogénicas en la Sierra el Mechudo, Baja California Sur, México

Mesa Zavala, Erika

Titre : Diagnóstico del hábitat del borrego cimarrón (Ovis canadensis weemsi) en función de variables ambientales y actividades antropogénicas en la Sierra el Mechudo, Baja California Sur, México

Auteur : Mesa Zavala, Erika

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

Grade : Doctorado en Ciencias en el Uso, Manejo y Preservación de los Recursos Naturales 2013

Résumé
The bighorn sheep, Ovis canadensis, is a species with high ecological and hunting value. Its distribution is fragmented naturally by its habitat requirements and by human activities. Baja California Sur is the southern distribution limit of the species, where human settlements are minimum, isolated, and generally associated to water sources and main roads. The outstanding human activities in Sierra de El Mechudo are mining, livestock, and hunting. The objective of this research was to diagnose human activities performed in the Sierra and their effect on the presence of bighorn sheep and its habitat, including topography, vegetation, and superficial water bodies. The study was performed in Sierra El Mechudo, which includes the common lands Tepentú, Ley Federal de Agua No. 2, and Ley Federal de Agua No. 3. Surveys were applied to assess the activities performed by settlers and companies located in the area ; we characterized the habitat, distribution, and activity of bighorn sheep and introduced species. All the information was compiled to obtain the natural index for the Sierra. The results showed that settlers have a harmonic perception towards nature, possibly caused by the lack of public services and the low socio-economical level. The distribution of human settlements is not related with bighorn sheep sighting sites. Livestock activity (cow, donkey, goat) is extensive, covering part of the natural habitat of bighorn sheep, mainly in the areas with free available water. The most relevant anthropogenic activity is mining although it only modifies the habitat locally. Tourism activity is limited at the moment. The main activity related with bighorn sheep is sport hunting, performed within the Units for Conservation, Management, and Exploitation of Wild Life, which apparently have not provided the expected economic and environmental benefits. All together, the natural index highlighted that the most natural area is the one that includes steep topography ; the intermediate levels are found in sites with human settlements and limited public services ; and the most affected areas are those with the influence of mining activity. Bighorn sheep do not avoid areas with higher anthropogenic activity, nor restrict to mostly natural areas.

Mots Clés : Sierra El Mechudo ; borrego cimarrón ; actividad antropogénica ; variables ambientales

Présentation

Version intégrale (1,41 Mb)

Page publiée le 19 octobre 2017