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Terrestrial Vertebrates of the Pueblo Nuevo Area of Southwestern Durango, Mexico

Robert G. Webb and Rollin H. Baker
The American Midland Naturalist
Vol. 68, No. 2 (Oct., 1962), pp. 325-333
DOI: 10.2307/2422738
Stable URL: http://www.jstor.org/stable/2422738
Page Count: 9
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Terrestrial Vertebrates of the Pueblo Nuevo Area of Southwestern Durango, Mexico
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Abstract

Amphibians, reptiles and mammals were collected in June and July, 1960, from El Salto southward to Pueblo Nuevo, southwestern Durango, Mexico. Collecting stations were established in four habitats designated as Boreal Forest, Pine-Oak Forest, Mixed Boreal Tropical, and Tropical Deciduous Forest. The last two habitats memtioned occur in one of the numerous large barrancas or canyons that dissect the irregular plateau of the Sierra Madre Occidental. Habitats of Boreal Forest and Pine-Oak Forest occur on the plateau. This report emphasizes the change in kinds of vertebrates with decreasing altitude in the barranca, and the increasing resemblance of the vertebrates to those of the arid tropical lowlands of the Pacific Coast. Many species occurring in Durango are certainly found only in the lower elevations of the barrancas, and have extended their ranges eastward into western Durango from the coastal lowlands, owing to the continuance of suitable habitats provided by the deep barrancas. In addition, these protected barrancas provide habitat for some animals characteristic of humid tropical environments found to the southward rather than to the westward along the Pacific Coast of Sinaloa and northern Nayarit. Herein, five kinds of amphibians, six kinds of reptiles, and seven kinds of mammals are recorded for the first time from the state of Durango.

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