Fig. S1.
Annual survival selection gradient (±1 SE) on colony size for breeding adult cliff swallows in relation to the selection gradient (±1 SE) in the same year for first-year birds. Adult males are shown by closed circles (●), and females by open circles (○). There was no significant correlation between the first-year selection gradient and that for adult males (rs = −0.13; P = 0.67; n = 13 y) or that for adult females (rs = −0.20; P = 0.50; n = 13) in the same year. Only years for which selection coefficients for both age groups were available could be included.