In southern Arizona and northern Sonora, the neotropical vine snake (Oxybelis aeneus) lives in temperate oak woodland, canyon riparian woodland, desert-grassland, and pine-oak woodland communities at 1160 to 1650 m elevation. Perennial plants in an… See more
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Resumen del Proyecto: El Buho Manchado Mexicano (Strix occidentalis lucida) se distribuye en Sonora bajo condiciones adecuadas en canadas y elevaciones medias en montanas, can bosques de pino, pino-encino y encino-pino. Actualmente, dentro del… See more
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Scenically spectacular, the Sierra Madre Occidental is challenging to researchers in ecology as well as in geology. Like mountain gradients elsewhere in tropical Mexico, it offers a variety of habitats and species. In this section we will introduce… See more
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The pine-oak woodlands of the Sierra Madre Occidental of Mexico extend for about 1100 km from the northern end ofthe Sonoran-Chihuahuan border southward to the region ofthe common borders of Zacatecas, Nayarit, and Jalisco. On the eastern side of… See more
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The Arizona hedgehog cactus, Echinocereus triglochidiatus var. arizonicus, was officially given Endangered status by the U.S. Fish and Wildlife Service under the Endangered Species Act of 1973 on October 25, 1979 (44 FR 61556). The taxon as… See more
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The Rio Yaqui drainage basin of northwestern Mexico comprises about 73,000 km of the most inaccessible and rugged terrain in western North America (Blásquez 1959). An average annual discharge of almost 2,800 ha2 makes the Rio Yaqui one of the major… See more
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Held in Tucson, Arizona. Foreward: The material offered in this symposium is both urgently needed and late in coming. Only in very recent years have scientists and managers begun to shift their perspective on riverine systems away from localized,… See more
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The Monte Desert of Argentina and the Sonoran Desert of North America are very similar in most aspects of their physical environments. The origins and the degree of affinity of thefaunas of three classes of vertebrates in the two deserts are… See more
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Marshall, C. J. and J. K. Liebherr. 1976. Cladistic Biogeography of the Mexican Transition Zone. Journal of Biogeography 27(1): 203-216. Biogeographic relationships among nine montane areas of endemism across the transition zone between North and… See more
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Woodland of mixed pines and oaks is familiar mountain scenery in Mexico, whence it extends into southeastern Arizona along with many kinds of Mexican birds. This woodland occupies a belt from about 5500 to 6500 feet in elevation between encinal (oak… See more
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Aldo Leopold's son, Starker Leopold, reviews changes to the Rio Gavilan region in the northern Sierra Madre since he was a kid.
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Vegetation and Flora research from 1938 to 1941 in the Rio Bavispe / Sierra El Tigre region. At that time White said that the area "...certainly is one of the least known regions of the North Mexican border" and "has been almost completely neglected… See more
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