Figure 1.
Within- and among-breed heritability estimates, and breed-level behavioural data. (a) Heritability (h2) estimates (proportion of variance attributable to genetic factors) for 14 behavioural traits. Genotypic variation accounts for five times more variance in analyses across versus within breeds (within-breed estimates compiled from Ilska et al. [44]). Points for Hayward et al. [4] and Parker et al. [19] reflect the results of analyses with independent genetic datasets. Error bars reflect the 95% confidence intervals. (b) Heatmap of breed-average behavioural scores plotted alongside a cladogram of breed relatedness from Parker et al. [19]. (Online version in colour).