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Accueil du site → Master → Mexique → Maestría → Caracterización del hábitat y fauna asociada a los cuerpos de agua superficial en el sur de la Sierra de El Mechudo, B.C.S. México

Centro de Investigaciones Biológicas del Noroeste (CIBNOR) 2008

Caracterización del hábitat y fauna asociada a los cuerpos de agua superficial en el sur de la Sierra de El Mechudo, B.C.S. México

Mesa Zavala, Erika

Titre : Caracterización del hábitat y fauna asociada a los cuerpos de agua superficial en el sur de la Sierra de El Mechudo, B.C.S. México

Auteur : Mesa Zavala, Erika

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

Grade : Maestría en Ciencias en el Uso, Manejo y Preservación de los Recursos Naturales 2008

Résumé
Waterholes are main support for desert ecosystems. Each waterhole has particular environmental characteristics, given by the abiotic factors where they are found as well as for the biotic factors generated by them. Species distribution and abundance in the waterhole differs between sites due to habitat characteristics where they are found. It is important to know the fauna found in a restricted habitat, as well as the characteristics of the above mentioned habitat given its fragility to climatic and human impacts. The goal of study was to identify the faunistic composition and diversity associated with waterholes, as well as environmental and hydrological characteristics of these in the southern part of Sierra El Mechudo, B.C.S. Characteristics of vegetation, topography, hydrological balance, chemical and microbiological properties of water, and fauna associated to waterholes were evaluated in four Topographic Water Systems (TWS) (creeks and glens). The palm trees in TWS does not necessarily indicate waterhole presence, nevertheless riparian vegetation persist supported mainly by microenvironmental characteristics created by underground dampness and physiography. Every TWS showed different topographic properties creating different water accumulation, for example, sites with soil predominated by rocky surface presented the biggest water tanks and longest duration. According to hydrological balance values obtained, the phreatic mantles of water supply are sufficient to support these waterholes. Water quality is affected by soil type and fauna which visits the waterholes. In this study, about 63 % of species reported in the literature for the region was recorded, emphasizing relevant species, as bighorn sheep. Their distribution and abundance was heterogeneous in TWS, and the species composition between sites was different except between El Sauzoso and Cañada Norte according to discriminant function analysis. Two kinds of fauna sampling were used, direct and indirect sight, and camera-trap ; nevertheless, we think the second kind was the most effective, because the use records of waterholes were obtained without affecting species behavior by human presence. This research is relevant because there are no studies in the peninsula of Baja California that analyze the conditions of waterholes and their role on the diversity and interactions of wild and domestic fauna ; in addition, it contributes with relevant information about the species distribution in TWS and the utilization and impact on the waterholes. In this manner it complements knowledge of species, habitat and behavior, basic elements for natural areas conservation and management.

Mots Clés : Cuerpos de agua superficial ; sistema topográfico hídrico ; fauna ; trampas-cámara ; Sierra de El Mechudo

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Page publiée le 27 novembre 2017, mise à jour le 26 décembre 2019