Interest in the new philosophy of ecosystem management led the Forest Service to sponsor a study of past land use in the Lone Mountain/San Rafael Valley Ecosystem Project Area, part of the Sierra Vista Ranger District of Coronado National Forest in southern Arizona. In order to better understand…

The Sierra Madre Occidental (SMO) extends from northeastern Sonora and northwestern Chihuahua south through western Mexico to the Transverse Volcanic Axis in the state of Guanajuato, which forms a montane bridge to the Sierra Madre del Sur to the south and the Sierra Madre Oriental to the east.…

Renewed botanical interest in the Sonoran islands of the Gulf of California (Islas Tiburón, San Esteban, San Pedro Nolasco, Dátil, and Alcatraz) as part of our project, “Botanical Diversity of Isla Tiburón and Satellite Islands, Gulf of California,” has resulted in 61 new ad- ditions…

On May 3, 1887, a major earthquake shook much of the southwest United States and Mexico, an area of nearly two million square kilometers. This seismic event, with an estimated magnitude of 7.2 (DuBois and Sbar, in press), caused 51 deaths in northern Sonora, and major destruction of property in…

More than one third of Forrest Shreve's (1951 ) Sonoran Desert lies within the boundaries of Sonora, the second largest state in Mexico. Five of the seven major vegetational subdivisions of the Sonoran Desert are found within Sonora as well, more than in any other state. It is safe to say that…

In this paper, we describe and present the results of our effort to establish a spatial delineation of the Mogollon Highlands region—an ecologically fascinating North American transition zone of continental importance. is dramatic landscape of escarpments, canyons, mesas, deserts, and high…

Buffelgrass loves south-facing hillsides in the Sonoran Desert, especially in Sonora. In some cases it replaces nearly all native vegetation except older trees and cactus that persist from before the invasion took place.

This area was cleared and tilled for buffelgrass. Now it is a virtual monoculture of buffelgrass, which provides poor forage for cattle, the whole point of the operation.