Hatching success (%) of the three mating treatments (sibling, within-population and among-population pairs).

<p>Hatching success was lowest for sibling matings (light grey), followed by within-population matings (grey) and was highest for among-population matings (dark grey). Box plots show the quartiles (box limits), the 10^th and 90^th percentiles (error bars) and the median (line). Statistically significant differences are indicated (*).