![]() We conclude that diet composition of the hawks we studied was not directly affected by interspecific competition and that shifts in diet overlap during prey shortages do not necessarily imply that interspecific competition is occurring. The Coast Guard issues information 1.05-15 Liability for damages. Although our findings on diet shifts differ from those of most other studies, the implications are consistent with observations of others who have studied assemblages of mammal-feeding raptors. I not less than thirty days nor more 72.01-1 Purpose. Available data on differences in habitat composition and prey availability at the sample sites did not explain the deviations from the predicted response. In contrast to predictions, the two species converged on similar-sized prey during the prey shortage. Species composition of the two hawks' diets diverged during the prey shortage, but the divergence was most pronounced in hawks that did not share foraging ranges with interspecifics. Current theory predicts that diets should diverge during prey shortages and that overlap should be especially reduced in ranges shared with interspecifics. ![]() ![]() Diets of pairs that shared their foraging ranges with interspecifics were contrasted with those of pairs whose home ranges did not overlap with interspecifics. Diets of nesting Red-tailed Hawks (Buteo jamaicensis) and Ferruginous Hawks (Buteo regalis) were sampled before and after a decline in the hawks' principal prey species. 1: Hazen (1893) d10: grain size(mm) at 10 cumulative percent (effective grain size).
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