The western and southern edges of the Madrean Sky Island region are poorly defined and have received little study. After exploring mountains in these areas, we documented range extensions and additional records for several species of interest.… See more
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The Peloncillo Mountains and its surrounding valleys, ranges and drainages anchor the center of the Sky Island region—a region of the southwestern United States and northwestern Mexico characterized by isolated mountain ranges separated by desert… See more
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Presently, the flora of the Sierra de Mazatán contains 357 species of vascular plants distributed in 248 genera and 80 families. The families with the most species are Asteraceae (48), Fabaceae (45), Poaceae (28), Euphorbiaceae (18), and… See more
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Executive Summary A bi-national team worked from August 2001 through February 2003 to systematically analyze the best scientific information available for the 30-million acre (12-million ha) Apache Highlands ecoregion. The objective was to identify… See more
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From July 1998 to July 2000 we collected locality information and habitat associations for 36 records of the Endangered ocelot Leopardus pardalis in the Mexican State of Sonora. Twenty-seven (75%) of the records for which we could determine the… See more
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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
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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
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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
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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
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Trip report from 1998 expedition to the Sierra de los Ajos by a group of diverse biologists and geologists.
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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
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