Foraging Niche Shifts in Multispecies Dabbling Duck (Anas spp.) Feeding Groups: Harmful and Beneficial Interactions between Species, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 17, No. 4 (Dec., 1986), pp. 333-346
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Hannu Pöysä (1986) studied this question.
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