Abstract

SALINAS-ORTIZ, Quetzalli et al. Reproductive success of Savannah sparrow (Passerculus sandwichensis sanctorum) in San Benito Archipelago, Mexico. Rev. Mex. Biodiv. [online]. 2015, vol.86, n.1, pp.196-201. ISSN 2007-8706.  https://doi.org/10.7550/rmb.36992.

The Savannah sparrow of San Benito (Passerculus sandwichensis sanctorum) is an endemic subspecies of San Benito´s archipelago which is listed by the Nom-059-Semarnat-2010 as an endangered subspecies. It has never been studied before. We describe its reproductive biology in the archipelago, and compared with the reproductive success among the populations from the different islands of the archipelago: San Benito Oeste (SBO), San Benito Medio (SBM) and San Benito Este (SBE). The nests were monitored from April to July 2011. The daily survival rate was higher in SBO (0.9779, n= 68), than in SBM (0.9711, n= 34), and in SBE (0.9508, n= 27). However, the reproductive success did not show significant differences among islands (χ2= 0.8586, p> 0.05 gl 2, n= 3). The survival rate of the nesting cycle in the SBO was 56.0%, in SBM was 46.7% and in SBE was 26.9%. The results of this study did not show that the introduced Cactus Mouse in SBO (Peromyscus eremicus cedrocensis) preys on Savannah sparrow nests, although it could be competing for food and space.

Keywords : Nest cycle; Endemic; Nest predation; Exposure days; Endangered species.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )