Figure 1: Allele frequency change at a nonsynonymous TLR3 SNP in the Cousin population of the Seychelles warbler over 25 years (1993 - 2018). Points refer to TLR3 allele frequencies in the adult population in a given year, the TLR3 A allele in dark green, the TLR3 C allele in yellow. Solid lines show linear regressions for the adult population. Dashed lines indicate frequencies in sampled individuals hatched in each year. The shaded grey area (right hand axis) shows the percentage of the adult population (mean: 310 individuals) screened in each year.