Grasslands of central and southern Arizona, southwestern New Mexico and northern Mexico, an area known as the Apache Highlands Ecoregion, have undergone dramatic vegetation changes over the last 130 years, including encroachment by shrubs, loss of… See more
Date published:
While biologists have been aware of the existence of native Mexican trouts for over a century, they have received little study. The few early studies that did muchmore than mention their existence began in the 1930s and continued into the early… See more
Date published:
An Endangered Species within Organ Pipe Cactus National Monument: Historical Significance and Management Challenges The largest body of water at Organ Pipe Cactus National Monument is Quitobaquito springs and pond, home to the Quitobaquito desert… See more
Date published:
The Sonoran Desert is considered to be the most “tropical” of the North American deserts. Its climate is virtually frost-free, and summer rainfall comes from the tropical oceans. The Sonoran Desert’s structurally diverse vegetation, which includes… See more
Date published:
Trip report from 1998 expedition to the Sierra de los Ajos by a group of diverse biologists and geologists.
Date published:
The pine-oak forests of the Sierra Madre Occidental, a mountain range in NW Mexico, have recently been recognized as an area of high endemism and biodiversity. Selective logging threatens three bird species endemic to this habitat, who depend on… See more
Date published:
The old growth forest on Mt. Graham (Pinaleno Mountains) of eastern Arizona is comprised of forest patches rather than being homogeneous in composition. These patches reflect the heterogeneity of disturbances that occur on the mountain. The two… See more
Date published:
Biodiversity and Management of the Madrean Archipelago. The Sky Islands of Southwestern United States and Northwestern Mexico. Previous work on biogeographic isolation has concerned itself with oceanic island chains, islands associated with… See more
Date published:
We report here on the flora of the Sierra de los Ajos, Sonora, Mexico, based on collections made in 1992 and 1993. The known flora of this Sky Island range contains 376 species of vascular plants in 93 families. Based on our collections and the… See more
Date published:
The Apachian-Madrean region is a zone of confluence and geographic termini of species and floras from the north and the south. Lower and intermediate elevations support many taxa of tropical plants and animals that are at their northernmost limits.… See more
Date published:
Bi-National Conference September 19-23, 1994 Tucson, Arizona This conference brought together scientists and managers from government, universities, and private organizations to examine the biological diversity and management challenges of the… See more
Date published: