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© 1994 International Society for Behavioral Ecology

research-article

Dominance and diet selection in juncos

Tom A. Langen and Kerry N. Rabenold

Department of Biological Sciences, Purdue University West Lafayette, IN 47907,USA

ABSTRACT

We measured the effects of dominance on diet in an aviary flock of seven dark-eyed juncos (Junco hyemalis).Preferences among six types of foods were recorded for each individual while solitary, and compared to that individual's diet when in the flock. Individuals specialized on different foods during the flock trial. Subordinates showed greater shifts in diet between the solitary and flock trials, had less diverse diets than dominants in the flock, and reduced the proportion of their diet consisting of preferred foods to a greater extent than dominants. We interpret this change in diet by subordinates as a response to interference competition by dominants at preferred foods.

Key words: diet selection, dominance, group foraging, interference competition, Junco hyemalis, resource partitioning.


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