Food Availability But Not Sex Determines Morning Foraging Area Size in the Great Bustard Otis tarda, the Most Sexually Size-Dimorphic Bird Species
作者： Luis M. Bautista , Carolina Bravo , Carlos Ponce , Dácil Unzué-Belmonte , Juan Carlos Alonso
DOI: 10.13157/ARLA.64.2.2017.RA1
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摘要: Summary. Sexual size dimorphism (SSD) may favour physiological peculiarities in diet, behaviour and home-range both across species within species. Sex-specific differences diet have been reported several bird but there are fewer studies of foraging area sexually dimorphic Foraging should be greater the bigger sex according to predictions based on body mass. We tested this prediction a winter study Great Bustard Otis tarda, most size-dimorphic species, which forages unisexual flocks. In temporal pattern flock's feeding intensity; proportion birds actively (FI) morning (MFA) each unknown. recorded movements flocks Bustards during mornings sampled food availability take into account its effect FI MFA. increased then dec...
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