SEX BIASES IN AVIAN DISPERSAL - A REAPPRAISAL

We reviewed the avian literature for quantitative studies of sex biase s in dispersal and found continued and strengthened support for the ge neral pattern of female biased dispersal established by Greenwood in 1 980. We report sex differences in dispersal patterns in natal and bree ding dispersal as measured by 1) proportion leaving and 2) distance mo ved. Greenwood's review found evidence for male biased dispersal only within four species of the Anatidae. We find there is now evidence for male biased dispersal in twenty-two species representing twelve famil ies.