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- W2003442021 abstract "The progeny of early-nesting Sparrowhawks Accipiter nisus have a higher survival rate than those of late nesters. To ascertain the reasons for greater survival in early-season Sparrowhawk fledglings, I studied post-fledging dispersal behaviour in this species by direct observations and radio-tracking during 3 years in Rockingham Forest, Northamptonshire, U.K. Post-fledging brood-parasitism was found among early-dispersed young of both sexes. Early-dispersed young spent up to 6 days being fed by the parents of other fledged, but still dependent, broods, as far as 6 km from their own nests. Three broods were provided with supplementary food for 4 weeks, starting 1 week before expected dispersal. These young dispersed when significantly older than young from control broods. In both groups, males dispersed, on average, 3–4 days earlier than females. The ultimate dispersal age of young in control broods was negatively correlated with their rate of mass gain during the nestling period. Unlike the young of the control broods, fledglings in broods with augmented food were usually silent. These findings offer an explanation for why Sparrowhawk young that disperse early in the season survive better than those which disperse late." @default.
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- W2003442021 date "2008-04-03" @default.
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- W2003442021 title "Intraspecific brood-parasitism and dispersal in fledgling Sparrowhawks Accipiter nisus" @default.
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- W2003442021 doi "https://doi.org/10.1111/j.1474-919x.1994.tb01117.x" @default.
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