Figure 2
From: Costs of receipt and donation of ejaculates in a simultaneous hermaphrodite
Number of copulations in experimentally imposed mating roles. The number of copulations of Lymnaea stagnalis in the imposed mating role(s). The bars indicate the mean number of copulations as a recipient (white bars) and as a donor (black bars) ± 1 SE. Note that an X indicates prohibited mating roles (missing values), that were excluded from statistical analysis.