Figure 3.

The relationship between annual dispersal rate (i.e. the proportion of recruits that dispersed from their natal island) in a house sparrow metapopulation in northern Norway and (a) spring temperature, (b) onset of breeding estimated as mean day of first egg and (c) total population size (adults plus juveniles) on the natal islands. Islands were categorized as farm islands (open circles and dashed lines; in total 371 philopatric and 36 dispersing individuals) or non-farm islands (grey circles and solid lines; in total 103 philopatric and 48 dispersing individuals). The dispersal rates were estimated as the proportion of recruits that performed inter-island natal dispersal. 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.