INVESTIGADORES
BRAVO Susana Patricia
artículos
Título:
Comportamiento de alimentación del Fio-fío Silbón (Elaenia albiceps chilensis) en bosques de la patagonia.
Autor/es:
CHUST, L; CUETO VR; GUERRA NAVARRO, C; BRAVO S. P.
Revista:
ORNITOLOGIA NEOTROPICAL
Editorial:
NEOTROPICAL ORNITHOLOGICAL SOC
Referencias:
Lugar: ALEMANIA; Año: 2012 vol. 23 p. 313 - 323
ISSN:
1075-4377
Resumen:
Foraging behavior and microhabitat selection of the White-crested Elaenia (Elaenia
albiceps chilensis) in Patagonia forests. ? The study of foraging behavior is useful to understand how
birds use the environment and what factors play an important role in habitat selection. We evaluated the
maneuvers used to capture prey and the selection of foraging microhabitat by the White-crested Elaenia
(Elaenia albiceps chilensis), a very abundant migratory bird in Patagonian forests during spring and summer.
Behavioral observations were made in mixed forests of Cohiue (Nothofagus dombeyi) and Cypress
(Austrocedrus chilensis). We compared patterns between forests that experienced tree extraction of the
first species to others in which no human alterations took place. In both forests conditions, White-crested
Elaenias mainly used sally-hovering to capture prey and to a lesser extent glean and sally-strike. The
most commonly used substrate for prey capture was the foliage. The foraging microhabitat selected in
both sites was the canopy, and Coihue trees. The rest of the vegetation profile and other species of trees
and shrubs were used less than expected by chance. It is thought that birds that capture their prey by
hovering are not constrained by the structure of the vegetation; however, White-crested Elaenias
selected specific foraging microhabitats, suggesting that other environmental variables, such as differences
in food supply, could drive the foraging behavior of this species. Coihue trees extraction in the past
did not change the foraging behavior of White-crested Elaenias, and it could be negative for populations
that eventually face alteration of native evergreen forests of Patagonia.