Figure 5. Estimates of ΔPBS on Super-Scaffold 99 corresponding with the region shown in Figure 4a (smoothed using the geom_smooth function in ggplot to summarize data in 2500-bp windows).

(a) Estimates for resident continent, medium-distance NW, SW and SE migrants, and short- and long-distance birds. These estimates are only elevated in the resident continent phenotype, ruling out a role for linked selection in generating this signature in residents. (b) Estimates for the resident continent and island birds (Azores, Canaries and Cape Verde), which are all elevated, implying that parallel selection is probably involved in the transition from migration to residency in this region. Colours correspond to Figure 1a with yellow showing data for resident continent birds.