Figure 3. Intensity of red (I_R) at the pelvic spines of three-spined sticklebacks from 17 different sites.

Box-Whiskers plot of intensity of red (I_R) at the pelvic spines of three spine stickleback males (open bars) and females (hatched bars), from 17 different sites. “Site number” refers to Table 1. The numbers in the figure show sample size. The three dotted horizontal lines are at I_R-values 0.46, 0.37 and 0.35, which represent I_R-values of the pelvic spines from the three fish shown in Fig. 2.