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.

The Rock Horned Lizard (Camaleón de Piedra, in Spanish), Phrynosoma ditmarsi, is a poorly known Mexican endemic species with a distribution restricted to the state of Sonora. The International Union for Conservation of Nature (IUCN) has categorized this species as Data Deficient (Frost…