Abstract

Barro Colorado Island (BCI) in Lake Gatun was formed early in the twentieth century when the Chagres River was dammed to form part of the Panama Canal. Since its isolation as an island, BCI has been an ideal laboratory for the study of extinction/colonization patterns on a recently isolated, continental island (Terborgh 1974; Willis 1974; Wilson and Willis 1975; Willis and Eisenmann 1979). The foundation for these studies was a list of birds observed on BCI. I analyze the BCI avifauna in a different way. First, I sampled birds of the forest undergrowth on BCI and in the Pipeline Road (PR) area of Parque Nacional

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