Resumen

ALMAZAN-NUNEZ, R. Carlos  y  NAVARRO S., Adolfo G.. Avifauna of the Río San Juan Basin, Guerrero, Mexico. Rev. Mex. Biodiv. [online]. 2006, vol.77, n.1, pp.103-114. ISSN 2007-8706.

We present an analysis of the species richness and abundance of birds in several localities of the Río San Juan Basin, state of Guerrero, region belonging to the Balsas Basin biotic province. The field work was performed from June 2001 to September 2002. The species richness was 164 species, and for some species its geographic distribution within the state is expanded. The species richness was significantly higher in tropical deciduous forest, which also holds the greatest number of exclusive species. The seasonal component indicate that 72% of the species are residents and the 28% remaining are migratory. There are a major proportion of rare species (37.5%) and uncommon (38.2%) than abundant (2.12%) and common (3.5%). The endemism in the region is high, because 28% of the species are endemic to Mexico. Six species are considered threatened.

Palabras llave : birds; species richness; tropical deciduous forest; Río San Juan Basin; Balsas Basin; state of Guerrero.

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