Submitted to: Ecosystem Health
Publication Type: Book / Chapter
Publication Acceptance Date: 5/1/1998
Publication Date: N/A
Technical Abstract: The desert grasslands are widely distributed in North America, occupying much of southeastern Arizona, the southern half of New Mexico, and west Texas in the United States and extending southward through 13 states in Mexico, from Sonora to Puebla. They represent more than 500,000 km**2 of basin and valley lands that skirt the hills and mountain ranges of southwestern North America. The entire geographic range of the desert grasslands has seen a rapid decline in grass cover and an increase in cover by woody shrubs, especially mesquite (Prosopis spp.) and creosotebush (Larrea tridentata). Traditionally, the desert grasslands have supported extensive stands of perennial bunch grasses, known colloquially as the grama grasses, which reproduce primarily by stolons. Other, smaller bunch grasses occupied habitat patches such as infrequently inundated swales that support a cover of tobosa grass, Hilaria mutica.