Tamaño poblacional del oso negro (Ursus americanus) en dos Islas del Cielo del Noreste de Sonora, México.

Authors

  • María Eugenia Espinosa-Flores Laboratorio de Zoología, Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro. Av. De las Ciencias S/N, Col. Juriquilla, Santiago de Querétaro 76230.
  • Nalleli E. Lara-Díaz Laboratorio de Zoología, Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro. Av. De las Ciencias S/N, Col. Juriquilla, Santiago de Querétaro 76230.
  • Carlos Alberto López-González Laboratorio de Zoología, Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro. Av. De las Ciencias S/N, Col. Juriquilla, Santiago de Querétaro 76230.

Keywords:

abundance, carnivores, density, patch size, Sky Islands, cameras traps

Abstract

The black bear is an endangered species in Mexico, like the majority of the large carnivores they are distributed in small and isolated populations and thus their conservation depends on understanding their population status. During 2009, we estimated the abundance and density of the black bear in Sierra de Ajos and Sierra de San Luis in the Northeast Sonora, using camera traps. We defined patches (Sierras) as a combination of elevation and vegetation types in this part of the range. We extrapolated the densities to patch area to estimate population size, obtaining a density of 14.0 ind/100 km2 in San Luis and 2.0 ind/100 km2 in Ajos and a population size of 218 and 24 individuals respectively. Sierra de San Luis is a larger patch than Sierra de Ajos, which influences directly the population size directly. Furthermore, Sierra de Ajos is isolated from other Sky Islands, resembling a sinkhole population with no evidence for reproduction. It is necessary to continue monitoring black bear populations of the Sky Islands, to determine population trends and related factors that cause the variation of population size among the Sky Islands.

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Published

2012-12-30

Issue

Vol. 3 No. 3 (2012)

Section

Articles

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