Abstract
Abstract Dispersal is a key parameter for understanding demography and is consequently critical to conservation management. Peregrine Falcons (Falco peregrinus) in eastern North America exemplify a population that collapsed to extirpation and, subsequent to reintroduction, experienced a rapid, dispersal-based expansion back into its former range. To understand how dispersal and its correlates may be impacting falcon demography and encounter rates, we looked for (a) patterns of sex- and site-based differences in the dispersal movements of Peregrine Falcons from Pennsylvania, U.S.A.; (b) trends in density dependence in dispersal distances; (c) linkages between natal- and breeding-site characteristics; and (d) causes of death of Peregrine Falcons. Female peregrines showed significantly greater natal dispersal distances (337.7 ± 164.5 km; n = 24) than did males (161.4 ± 177.7 km; n = 21), but there were no statistically significant differences in dispersal distances of all birds or in breeding-site select...
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