Mortality and dispersal in summer and its consequences for the density of great tits Parus major at the onset of autumn.

Abstract

The differences in density of juveniles in oak-rich and adjacent other habitats on 1 September are much larger than can be expected from the reproductive rates and the total survival rates. This is mainly a result of dispersal by broods in the dependent period. Any differences in juvenile density at 1 September will be found back in differences in territory density in autumn and hence in spring.- from Author