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1 June 2012 Reproductive Ecology and Characteristics of Denning Sites of the San Clemente Island Fox
Jessica R Resnik, William F Andelt
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Abstract

We monitored movements of 27 radiocollared females of the San Clemente Island fox (Urocyon littoralis clementae) during 2007 to determine the proportion that produced litters, number of offspring in weaned litters, chronology of reproduction, and characteristics of denning sites. Of 23 females, three or four produced a total of six pups. Of 13 recaptured and examined for reproductive status, most had lactated in previous years (n = 7) or had some evidence of lactating but not weaning pups (n = 4); two females had never lactated. Breeding and parturition occurred 2 months earlier than reported for other subspecies of island foxes in wild-born or captive-breeding populations since the 1970s. Females used two or three dens in succession and dens were almost exclusively in rock crevices. Five of 23 foxes had home ranges that included sources of supplemental food and human habitation, including all four females observed with pups, suggesting this could be a factor in reproductive success.

Seguimos los movimientos de 27 hembras del zorros isleños (Urocyon littoralis clementae) con collares de radiotransmisores en el 2007 para determinar la proporción de las que parieron, el número de crías destetadas, la cronología de la reproducción, y las características de las madrigueras. Solamente tres o cuatro de las 23 hembras parieron un total de seis cachorros. De las 13 hembras que fueron recapturadas y examinadas para determinar su estado reproductor, la mayoría había lactado en años previos (n = 7) o mostraban evidencia de lactancia pero no de cachorros destetados (n = 4); y dos hembras no habían lactado. Apareamientos y partos ocurrieron 2 meses antes de lo reportado previamente para otras poblaciones de subespecies de zorros isleños de poblaciones silvestres o en cautiverio desde la década de los 1970. Las hembras usaron dos o tres madrigueras en sucesión y estas fueron situadas casi exclusivamente en grietas rocosas. Cinco de las 23 zorras tuvieron rangos de hogar que incluían fuentes de alimentos suplementarios y asentamientos humanos, incluyendo las cuatro hembras con cachorros, sugiriendo que esto puede ser un factor para el éxito reproductivo.

Jessica R Resnik and William F Andelt "Reproductive Ecology and Characteristics of Denning Sites of the San Clemente Island Fox," The Southwestern Naturalist 57(2), 170-175, (1 June 2012). https://doi.org/10.1894/0038-4909-57.2.170
Received: 1 October 2010; Accepted: 1 March 2012; Published: 1 June 2012
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