AVIS-IBIS

Birds of Indian Subcontinent

Density and Habitat Use by Owls in Two Amazonian Forest Types / (Densidad y uso de habitat por varias especies de buhos en dos tipos de bosques amazónicos)

Publication Type:Journal Article
Year of Publication:2004
Authors:Borges, SHenrique, Henriques, LMagalli, Carvalhaes, A
Journal:Journal of Field Ornithology
Volume:75
Issue:2
Date Published:2004
ISBN Number:02738570
Keywords:Asio, Asio stygius, Ciccaba, Ciccaba huhula, Glaucidium, Glaucidium brasilianum, Megascops, Megascops choliba, Otus, Otus choliba, Phalaenopsis, Phalaenopsis brasiliana, Pulsatrix, Pulsatrix perspicillata, Strigidae, Strix, Strix huhula
Abstract:We conducted a short-term study on density and habitat use in an Amazonian owl assemblage. The census was conducted in terra-firme forest and black-water flooded forest or igapó forest. Six owl species were recorded, the Tropical Screech-owl (Otus choliba), the Tawny-bellied Owl (O. watsonit), the Black-banded Owl (Strix huhuld), the Spectacled Owl (Pulsatrix perspicillatd), the Ferruginous Pygmy-owl (Glaucidium brasilianum), and the Stygian Owl (Asio stygius). The most abundant species was the Tawny-bellied Owl (0.42 individuals/ha) followed by the Spectacled Owl (0.31 individuals/ha). Some species showed clear tendencies to use different habitats. The Tawny-bellied Owl was more abundant in terra-firme forest, while its congener, the Tropical Screech-owl, was much more common in igapó forest. The Stygian Owl and the Ferruginous Pygmy-owl were also recorded exclusively in the igapó forest census. These results indicate that terra-firme forest and igapó forest supported distinct owl assemblages. Our work and other studies suggest regional variability in owl density in Amazonia. /// Llevamos a cabo un corto estudio sobre la densidad y el uso de habitat en varias especies de buhos amazónicos. Se llevaron a cabo censos en tierra firme y en bosques inundados. En el estudio encontramos seis especies de buhos. Estos fueron: Otus choliba, O. watsonii, Strix huhula, Pulsatrix perspicillata, Glaucidium brasilianum, y Asio stygius. La especie más abundante resulto ser O. watsonii (0.42 individuals/ha) seguida de P. pespicullata (0.31 individuals/ ha). En tierra firme la especie más abundante resulto ser O. watsonii y en bosque inundado O. choliba. La especie G. brasilianum solo se encontró en el bosque inundado. Estos resultados indican que tanto el bosque de tierra firme y el inundado tienen sus propios grupos de buhos. Nuestro trabajo, al igual que otros, sugiere una variabilidad regional en la densidad de buhos en la Amazonia.
URL:http://www.jstor.org/stable/4151185
Short Title:Journal of Field Ornithology
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith