The significance of clutch overlap in Great Tits Parus major

摘要: We studied the effects of manipulation size first broods in Great Tit Parus major on and breeding success second clutches its relation to degree clutch overlap. The rearing brood fledglings always overlapped with laying most cases also incubation period latter. overlap depended brood, being less when was large. Clutch increased season. Mechanisms affecting timing are discussed. A large imposed reproductive costs. It affected by causing it be delayed; decreases post-fledging survival young as, this population, fledging date. was, however, not but instead weight female brood.