Figure 2.

Frequency histograms showing the effect of artificial courtship signal (attractive or unattractive) and spermatophore size (large or small) on second male paternity share (P₂ equals the proportion of offspring produced by doubly mated Photinus greeni females that were sired by the second mating male). Treatment descriptions indicate conditions for the second mating male: (a) unattractive courtship signal and small spermatophore; (b) unattractive courtship signal and large spermatophore; (c) attractive flash and small spermatophore; and (d) attractive flash and large spermatophore. Virgin females in all treatments were mated to two males at 24–72 h intervals.