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vol.57 suppl.1Phenotypic and molecular variation in the green and black poison-dart frog Dendrobates auratus (Anura: Dendrobatidae) from Costa RicaThe role of historical and local factors in determining species composition of the highland avifauna of Costa Rica and Western Panamá índice de autoresíndice de materiabúsqueda de artículos
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Revista de Biología Tropical

versión On-line ISSN 0034-7744versión impresa ISSN 0034-7744

Resumen

PEREIRA, Ana I  y  BARRANTES, Gilbert. Distribución y densidad de la avifauna de la Península de Osa, Costa Rica (1990-1991). Rev. biol. trop [online]. 2009, vol.57, suppl.1, pp.323-332. ISSN 0034-7744.

Distribution and density of avifauna in Península de Osa, Costa Rica (1990-1991). We recorded 205 bird species at the Península de Osa. The geographical distribution of most forest bird species within the peninsula is discontinuous (e.g., Corapipo altera and Tangara guttata), even within large forest tracts, indicating the adaptation of species to particular habitats, microhabitats, strata and/or diet within the forest. Birds use the forest strata in different proportion resulting in three different patterns: understory birds (e.g., Arremon aurantiirostris and Habia atrimaxillaris), supdosel birds (e.g., Cacicus uropygialis and Euphonia imitans), and birds that use several strata in similar proportion (e.g., Dendrocincla anabatina). Most of these forest birds feed upon insects and fruits. The density and relative abundance is very low for most species, with more than 90% of the species having less than an individual per hectare or kilometer of transect. These characteristics make this avifauna highly susceptible to deforestation and forest fragmentation. Rev. Biol. Trop. 57 (Suppl. 1): 323-332. Epub 2009 November 30.

Palabras clave : bird density; bird abundance; forest fragmentation; Osa Península; Costa Rica.

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