Individual variation in Seasonal Breeding Success of Pied Flycatchers (Ficedula hypoleuca).

(1) We present and analyse reproductive success data from a long term study of the pied flycatcher (Ficedula hypoleuca) nesting in the Forest of Dean, Gloucestershire. (2) Our measures of high reproductive success are earlier laying date, larger clutch size and more young fledged. (3) Breeding performances of both sexes inprove with age after breeding experience has been controlled for. (3) Breeding performances of both sexes inprove with age after age has been controlled for. (4) Females that have bred as both 1 and 2 year olds are more likely to survive to breed again than those that bred in their second year but failed to breed in their first year. (5) Females that have bred as both 1 and 2 year olds are more likely to survive to breed again than those that bred in their second year but failed to breed in their first year. (6) A male is more likely to survive to breed again after a breeding season in which its mate laid an early clutch. (7) The data indicate that at least 40% of males and females did not breed in their first year.