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Numerical Analysis of Rodent Distributional Patterns in Zacatecas, México
John O. Matson
Journal of Mammalogy
Vol. 63, No. 1 (Feb., 1982), pp. 73-84
Published by: American Society of Mammalogists
Stable URL: http://www.jstor.org/stable/1380673
Page Count: 12
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Rodent distributional patterns in the state of Zacatecas, Mexico, were analyzed by cluster and factor techniques. Forty-six species and five environmental variables were recorded from 57 quadrats within the state. Three separate indices of association between quadrats produced four major clusters in common to each that represented major ecogeographic units in the state: Desert, Grassland, Montane, and Tropical. Factor analysis defined or refined the same four ecogeographic units. Factor I separated a Desert fauna from a Grassland fauna. Factor II defined the Montane fauna. Factor III was associated with desert mountain ranges. Factor IV was associated with tropical canyons. Factor V defined a Desert-Grassland ecotone. Factor VI was associated with southern tropical canyons. Factor VII was associated with mesic habitats. A synthesis of the results of the two techniques produced five Rodent Faunal Areas.
Journal of Mammalogy © 1982 American Society of Mammalogists