Figure 1.

Results of the tests if females from the three populations of P. nyererei exerted directional intrapopulation sexual selection on different male colours. Fitted lines show predicted probabilities to be a sire based on the colourscores from the most likely GLMM model for each population mate choice experiment (PNM (a–c), PNP (d–g), PNS (h–i)). p-values derive from the most likely GLMM model explaining female mate choice except for PNP, where the p-values are derived from models with ‘forced’ backward selection (see Material and methods, electronic supplementary material, table S1). •p < 0.1, *p < 0.05, **p < 0.05.