Figure 4.

Time in (for males S_m; for females S_f) and time out (for males G_m; for females G_f) of the mating pool for the typical case where male PI is small relative to female PI (G_m<G_f). In this example, the adult sex ratio is M=2 males per female, so in time T (one cycle of reproduction for the female) one male will mate and then spend time out G_m replenishing gametes. Thus, the average time in per male is given as S_m for the two males, after equation (10.1). Modified from Clutton-Brock & Parker (1992) and Parker & Simmons (1996).