Figure 4. The effect of natural and sexual selection on genital shape, as defined by the Relative Warp (RW) scores.

Mean Relative Warp Scores for each population (i.e. 4 replicate populations/treatment ) were treated as a line means. Shown here are the three RWs that were significantly influenced by selection (Table 1). Open circles (o) and dashed line represent the elevated sexual selection treatment, filled circles (•) and solid line represents relaxed sexual selection (experimentally enforced monogamy). Inset figures show the shapes represented by high warp scores on the top inset panel and low warp scores on the bottom inset panel for each Warp. For RW2 and RW3 the interaction between sexual and natural selection significantly influenced shape, while for RW7, the interaction was not significant, but both modes of selection significantly influenced shape (Table 1).