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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Influence of environmental variables on foraging by juvenile American Robins
Auteurs :	E. Natasha Vanderhoff, Auteur ; Perri K. Eason, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (79(2) JUN 2008)
Article en page(s) :	186-192
Langues:	Anglais
Résumé :	Juvenile birds lack the experience of adults and, as a result, are typically less efficient foragers. Environmental factors can influence how birds forage and the outcome of foraging bouts, but few investigators have considered the effects of such factors on the foraging behavior of juveniles. We examined the effects of two environmental factors, sunlight and soil moisture, on the foraging behavior of juvenile and adult American Robins (Turdus migratorius). Both factors had a significant effect on robin foraging, with robins more effective at capturing arthropods in the sun and worms in moist soils. However, juveniles were less successful than adults across all conditions. Juveniles were less successful than adults at capturing arthropods and were less efficient at capturing worms. Juveniles captured an average of one worm per minute, whereas adults captured nearly two worms per minute. Additionally, the high failure rates of juveniles (0.44/min) as compared to adults (0.20/min) may be indicative of their inability to choose suitable prey items. Finally, we found that juveniles tended to forage with other robins more than did adults, suggesting that they may use other individuals as cues for locating favorable foraging sites.

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