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Foraging behavior of the white-browed (Basileuterus leucoblepharus) and the golden-crowned (B. culicivorus) warblers in a semidecidual forest in southern Brazil


, : Foraging behavior of the white-browed (Basileuterus leucoblepharus) and the golden-crowned (B. culicivorus) warblers in a semidecidual forest in southern Brazil. Ornitologia Neotropical 15(1): 5-15

This study intended to evaluate if differences occur in the foraging behavior of the Whitebrowed (Basileuterus leucoblepharus) and the Golden-crowned (B. culicivorus) warblers during different seasons (winter and summer). The variables evaluated were foraging height, attack manoeuvres and type and angle of substrate where the preys were attacked. The work was carried out in the winter/2000 and the summer/ 2001. The results show significant differences in the foraging behavior of these species in both seasons, with the variables of foraging height and substrate type presenting higher positive correlation coefficients with ordination axes. The White-browed Warbler caught prey frequently below 1 m, different from the Golden-crowned Warbler, which caught prey above 1 m. Gleaning was the most frequent manoeuvre used by the White-browed Warbler, while the Golden-crowned Warbler showed more equilibrium among the main manoeuvres (sally-strike and reach-out) and used aerial manoeuvres more often during the winter. The main foraging substrate used by the White-browed Warbler was the soil in both seasons, while the Golden-crowned Warbler used mainly green leaves during foraging and a greater variety of substrates during the winter. The results showed segregation between the two species of Basileuterus during foraging in both winter and summer. This study allowed to verify that Golden-crowned warblers present more generalist behavioral aspects when compared to white-browed warblers.

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