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The Protected Natural Area (PNA) “Corredor Biologico Chichinautzin” contains a large area of bunchgrasses, a habitat that is necessary for the zacatuche rabbit to survive. As part of a monitoring program used to evaluate the status of the zacatuche rabbit’s populations within this PNA, we estimated its distribution by using direct (sightings) and indirect methods (latrines) during visits performed to all the available habitats. Additionally, we estimated the annual density of the zacatuche rabbit using a line transect method, sampling eight, one-kilometer-long transects monthly during one year. Based on 101 latrine records and 48 sightings, a distribution map was prepared for the region using the convex polygon method in ArcView. Most of this distribution (166.43 km 2 ) represents an area that had not been previously reported in the literature for the zacatuche rabbit. Using the half-normal model that best fit the data, we estimated a density of 4.2 rabbits/ha. Our results suggest that the Corredor Biologico Chichinautzin meets the criteria necessary to be cataloged as a core distribution area for the zacatuche rabbit. Therefore, we suggest that both management and conservation of this habitat within the PNA should be made a priority. El Area Natural Protegida (ANP) “Corredor Biologico Chichinautzin” contiene una extensa area de pastizales amacollados, un habitat que es necesario para que el zacatuche sobreviva. Como parte de un programa de monitoreo para evaluar el estado de las poblaciones del conejo zacatuche en esta ANP, estimamos su distribucion utilizando metodos directos (avistamientos) e indirectos (letrinas) durante visitas a todos los habitats disponibles. Ademas, se estimo su densidad anual utilizando el metodo de transectos lineales, muestreando cada mes ocho transectos de un km de largo durante un ano. Con base en los registros de 101 letrinas y 48 avistamientos, se elaboro un mapa de distribucion para la region mediante el metodo del poligono convexo en ArcView. La mayor parte de esta distribucion (166,43 km 2 ) representa un area que no habian sido previamente reportada en la literatura para el zacatuche. Usando el modelo half-normal que fue el mejor que se ajusto a los datos, se estimo una densidad de 4.2 conejos/ha. Nuestros resultados sugieren que el Corredor Biologico Chichinautzin cumple con los criterios necesarios para ser catalogado como un area nucleo de distribucion para el zacatuche. Por lo tanto, sugerimos que el manejo y la conservacion de este habitat en el ANP deben ser una prioridad.

Distribution and density of the zacatuche rabbit (Romerolagus diazi) at the Protected Natural Area "Corredor Biológico Chichinautzin"