Abstract
Bird population densities on the island of Canas, Pearl Archipelago, Panama, were estimated by regression analysis of mist net captures of resident birds. The Canas mist net capture rate is very similar to those from adjacent Puercos, which is one seventh as big but otherwise similar. This not only confirms the main results of the Puercos study but also seems to rule out the action on these birds of the boundary phenomena described for mice by Krebs et al. in which confined populations greatly increased in density because of the small enclosure. The results are consistent with observations made by Diamond on southwest Pacific birds. See full-text article at JSTOR
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