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Foraging Patterns of Male and Female Scissor-Tailed Flycatchers (Patrones de Forrajeo en Individuos de Ambos Sexos de Tyrannus forticatus)

Kevin Teather
Journal of Field Ornithology
Vol. 63, No. 3 (Summer, 1992), pp. 318-323
Published by: Wiley on behalf of Association of Field Ornithologists
Stable URL: http://www.jstor.org/stable/4513713
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Foraging Patterns of Male and Female Scissor-Tailed Flycatchers (Patrones de Forrajeo en Individuos de Ambos Sexos de Tyrannus forticatus)
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Abstract

Male and female Scissor-tailed Flycatchers (Tyrannus forficatus) exhibited sexually dimorphic foraging patterns during the breeding season. Males foraged from higher perches and were less successful in catching prey. Females were more likely to forage on the ground and were more affected by windy conditions. Three hypotheses that may explain these differences (competition, morphology and breeding constraints) are discussed. /// Durante la época de reproducción la hembra y el macho de Tyrannus forticatus exhiben dimorfismo en sus patrones de forrajeo. Los machos forrajean desde perchas más altas y son menos exitosos en capturar presas. Las hembras son más propensas a buscar su alimento en los suelos y su forrajeo puede ser afectado por el viento. Se discuten tres hipótesis (competencia, aspectos morfológicos y limitaciones reproductivas) que podrían explicar las diferencias en los patrones de forrajeo.

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