Figure 2.

Assortment with respect to personality among (a) male and (b) female great tits in Marley during the breeding season. Circles mark the observed assortment score for each year (based on 5-nearest-neighbour networks), plotted with the standard error calculated from jackknife simulations. Vertical black lines denote the 95% confidence intervals generated under the null model (i.e. the values of assortment that are expected by chance given our data).