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Accueil du site → Doctorat → Mexique → Flora, Vegetación y Fitogeografía de la Sierra de Jimulco, Coahuila, México

Universidad Autonoma de Nuevo Leon (2011)

Flora, Vegetación y Fitogeografía de la Sierra de Jimulco, Coahuila, México

Alba Avila Jorge Arturo

Titre : Flora, Vegetación y Fitogeografía de la Sierra de Jimulco, Coahuila, México

Flora, Vegetation and Phytogeography of the Sierra de Jimulco, Coahuila, Mexico

Auteur : Alba Avila Jorge Arturo

Université de soutenance : Universidad Autonoma de Nuevo Leon

Grade : DOCTOR EN CIENCIAS CON ESPECIALIDAD EN MANEJO DE RECURSOS NATURALES 2011

Résumé
The Sierra de Jimulco for its variety of physiographic, climatic and soil, known for possessing biotic resources according to their different vegetation types and species that compose it, which increases their isolation of phytodiversity when evolutionary argues, contributes to cause endemic taxa, It is located in the arid extreme SW of the state of Coahuila, Mexico. In this study, we conducted field sampling of plants, data collection and observations of vegetation through a range of altitudes between 1,300 and 3,100 meters. Quadrants were established (400 m2) with three repeats at intervals of 150 m to measure coverage, density, diversity. In places, we assessed the location, terrain and climatic parameters. Botanical specimens were collected through transects in 25 established routes around the mountain to determine plant diversity present. The floristic list is made up 77 families, 241 Genera, 362 species and 29 infraspecific taxa. For these mountains and adjacent areas, including 40 endemic species of which 4 are exclusive to Jimulco. The main vegetation types recognized in the ecoregion are rosette desert scrub, desert scrub microphyll, chaparral-scrub, chaparral and sclero-aciculifolio forest-arid. The mountains play a very important function of vegetation it supports, which reflects the diversity as a result of evolutionary isolation which maintains and contributes to the generation of organisms with restricted distribution or endemic, both generic and specific, not being this condition except for Jimulco saw, which is part of the section of the Sierra Madre Oriental in the Laguna region of Coahuila. In this region, flow of origin plant species such as boreal some Pinaceae, with those that make up the Chihuahuan semi-desert scrub. The particularity of this region is its vast plant diversity found particularly in families Cactaceae, Asteraceae, and Fabaceae Agavaceae plus interest to implement a proper management of its natural resources that is already subject from the standpoint of agriculture and the study of useful vegetation (ethnobotanist) for the benefit of its inhabitants, also has elements that, as in the case of cacti and Agavaceae, show care for their protection and conservation. Two new locations are added to the known distribution of Mirandea grisea : an in southwestern Coahuila and another in the northeast of Durango. The distribution of species was significantly expanded to almost 200 km to the northwest in the Chihuahuan Desert Region.

Mots clés : Phytodiversity, Mirandea, Chihuahuan Desert, Sierra de Jimulco.

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Page publiée le 29 octobre 2012, mise à jour le 9 août 2017