Canotia holacantha Torrey is reported from the Gulf of California, Mexico on Isla Tiburón. This population is isolated from its closest conspecifics in northern Sonora by 230 km and is best explained as a Pleistocene relict. Previous reports of… See more
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Devil’s Canyon is located in Pinal County Arizona a few miles east of Superior in the Globe Ranger District of the Tonto National Forest. The area is extremely rugged with deep canyons, rocky ridges, and uplands dominated by large boulders and… See more
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Development proposals sneak up on remote and unsuspecting towns in the Gulf of California region, such as Bahia Kino, Santa Rosalillita, Bahia de Los Angeles, El Golfo de Santa Clara, Puerto Libertad, and Punta Colonet. Many of the residents have no… See more
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The Center for Biological Diversity and Defenders of Wildlife hereby formally petition the U.S. Fish and Wildlife Service (also “Service”) to list one of the following entities of cactus ferruginous pygmy-owl: 1) the Arizona distinct population… See more
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An ecologically based classification system, when accompanied by digitized maps of biotic communities, has been shown to be useful for plotting and assessing affinities of plants and animals in the southwestern United States and northwestern Mexico… See more
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Mexico is the fourth richest area in the world in terms of biodiversity (Challenger 1998; Flores & Gerez 1988; Mittermeier & Goettsch Mittermeier 1992). Efforts to set up nature reserves in Mexico have had three major periods: the beginning… See more
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Trip report on 2005 biological inventory of the Rio Aros and Yaqui from Natora, Sonora to Sahuaripa. Rafts and inflatable kayaks were used to gain access to this remote and rugged area. Trip participants included Aaron Flesch, Lane Larsen, Samia… See more
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The Sonoyta mud turtle, Kinosternon sonoriense longifemorale, is endemic to a small area in south- western Arizona and northwestern Sonora. The only U.S. population, at Quitobaquito, declined from several hundred in the 1950s to fewer than 100 in… See more
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Why This Report? In 2004, two major industrial developments—a liquid natural gas (LNG) regasification facility by Houston-based DKRW Energy and a “clean fuels” refinery by Arizona Clean Fuels of Phoenix, Arizona-- were announced by their promoters… See more
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About 1,500 collections from within 100 kilometers of the Arizona border in Sonora yielded noteworthy records for 164 plants including 44 new species (12 non-native) for Sonora and 12 (six non-native) for Mexico, conservation species, and regional… See more
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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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