An Example of Contemporary Colonization of Montane Islands by Small, Nonflying Mammals in the American Southwest

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Abstract
The yellow-nosed cotton rat (Sigmodon ochrognathus) is a montane specialist that occupies mainly oak-pinon-juniper and higher-elevation habitats. Its present pattern of distribution in southern Arizona and southwestern New Mexico indicates an extension of range northward from the eastern slopes of the Sierra Madre Occidental by expansion through continuous, montane, woodland habitat and by the contemporary colonization of one isolated mountain from another by crossing grassland gaps. Collection records indicate that this northward expansion has occurred in Arizona and New Mexico during the past 50 years and that it is continuing today.

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