. Wildlife and range research needs in northern Mexico and southwestern United States : workshop proceedings, April 20-24, 1981, Rio Rico, Arizona. Wildlife management Southwestern States Congresses; Wildlife management Mexico Congresses. Fig. 2.— Forest of predominately Pinus contorta in the Sierra de Juarez, 4. Pasture. This community extends from the foot of the mountainous areas at 1400 meters above sea level to the ocean shore. In the region of the Sonora River basin the main species are: Bouteloua spp., Hilaria sp., Aristida sp. , Muhlenbergia sp., Eragrostis sp., and Bromus sp. I
. Wildlife and range research needs in northern Mexico and southwestern United States : workshop proceedings, April 20-24, 1981, Rio Rico, Arizona. Wildlife management Southwestern States Congresses; Wildlife management Mexico Congresses. Fig. 2.— Forest of predominately Pinus contorta in the Sierra de Juarez, 4. Pasture. This community extends from the foot of the mountainous areas at 1400 meters above sea level to the ocean shore. In the region of the Sonora River basin the main species are: Bouteloua spp., Hilaria sp., Aristida sp. , Muhlenbergia sp., Eragrostis sp., and Bromus sp. In the Sierras Juarez and San Pedro Martir there is a pasture formed mainly by Bromus sp., Muhlenbergia sp., Festuca sp., and Agrostis sp. In the great pasture region of the Sonoran plain there are three types of thicket: a) Microphyllous thicket: made up by the main species: Cercidium sp. (palo verde), Prosopis sp. (mesquite), Olneyatezota, Fouquieria splendens (ocotillo), Larrea tridentata, Acacia sp. Fig. 3. b) Rosette type thicket: this includes Agave spp., Dasylirion wheeleri, Yucca spp. , and Nolina spp. c) Crassicaule thicket: species representative of this community are: Carnegia gigantea (saguaro), Cephalocereus sp., Echinocactus sp. , and Lephocereus Fig. 3.— Desert shrubland of predominantely ocotillo (Fouquieria splendens), pitahaya (Lemairecereus spp.), gobernadora (Larrea tridentata), and vinorama (Acacia sp.). In the peninsular region between 250 and 800 meters above sea level there is a xerophytic thicket formed by specimens between 6-10 meters tall. The most important species in this thicket are: Bursera microphylla, Lysiloma diva ricata, Berberis sp., Acacia sp. (vinorama), Cyrtocarpa edulis, Pachycereus pringlei, Ficus palmeri and Jatropha cenerea. WILDLIFE The great variety in types of vegetation of the northwest offers also a rich variety of habitats suitable for wildlife of a great diversity Due to the nature of this information and because other c
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