Abstract
Abstract Grazing of domestic livestock on public lands in the western United States is a major source of habitat destruction. I quantified nest success of ground-nesting Dark-eyed Juncos (Junco hyemalis) breeding in ponderosa pine forests and pine savanna in the Kaibab National Forest of northern Arizona. Comparison of results for areas grazed by cattle to results for immediately adjacent areas protected from grazing revealed that cattle grazing was associated with a dramatic (75%) reduction in nest success. Cattle grazing reduced vegetation cover over nests by an average of 41%, exposing the nest to more extreme climatic conditions as well as possibly making them more conspicuous to predators. El Pastoreo por Ganado Reduce Fuertemente el Exito de Nidificacion de Junco hyemalis en un Parque Forestal Nacional Resumen. El pastoreo por parte de ganado domestico en tierras publicas del oeste de los Estados Unidos es una de las principales fuentes de destruccion de habitat. Cuantifique el exito de nidificacion...
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