Figure 2.

The relationship between mean annual dispersal rate in a house sparrow metapopulation in northern Norway and: (a) year, (b) spring temperature, (c) egg laying day for the clutch from which the individual hatched, (d) adult population size and (e) total population size (adults plus juveniles). The dispersal rates were estimated as the proportion of second-year individuals (i.e. recruits) that dispersed from their natal island. Data on 558 individuals were used, 474 philopatric and 84 dispersers. The regression lines are predicted values from generalized linear models with binomial error and logit link function. For further information about the pattern of interchange of individuals among islands, see the electronic supplementary material, table S1.