Ecotype differences in mating propensity (mating frequency; Y-axis) in experimental high- and low- density treatments in both the stonewort and the reed ecotype.

<p>Mating frequency does not differ between the high- and low densities in either ecotype. However, there is a significant intrinsic difference in mating frequency between the two ecotypes (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0012755#pone-0012755-t001" target="_blank">Table 1</a>). Across densities, the reed isopods show a higher mating frequency than the stonewort isopods. Error bars denote 95% confidence interval.