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Effects of an 11-Year Livestock Exclosure on Rodent and Ant Numbers in the Chihuahuan Desert, Southeastern Arizona
Edward J. Heske and Mariel Campbell
The Southwestern Naturalist
Vol. 36, No. 1 (Mar., 1991), pp. 89-93
Published by: Southwestern Association of Naturalists
Stable URL: http://www.jstor.org/stable/3672121
Page Count: 5
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We censused rodents, counted ant colonies, and measured vegetative structure along 11 pairs of transects at a Chihuahuan Desert study site in southeastern Arizona. One member of each pair of transects was inside and one was outside of a 20-ha livestock exclosure that had been in place for 11 years. Vegetative structure did not differ between transects exposed to or protected from cattle grazing, but significantly more rodents were captured inside the exclosure. However, only a subset of the rodent species present, primarily Dipodomys, were negatively affected by the presence of cattle. Ant colonies were equally abundant on transects inside and outside of the exclosure, indicating that ants are more resistant than rodents to trampling and potential competition for food with cattle.
The Southwestern Naturalist © 1991 Southwestern Association of Naturalists