FIGURE 2.

(a) The predicted proportion of offspring sired by the second male P₂ (with 95% confidence bands) increases with the relative difference in copula durations between the competitors, more strongly for short‐spermed males in longer female spermathecal ducts (lines resulting from phenoloxidase (PO) selection; second experiment, N = 117 trials). (b) Mean P₂ (± 95% CIs) of long‐ versus short‐spermed males in females with short or long ducts (reduced data set with P₂ values of 0 and 1 removed; N = 64)