Fig. 4. Reproductive compatibility of field-derived Tetranychus urticae lines.

Reciprocal crosses were performed between different iso-female lines belonging to genotype groups C1N1, C2N2 and C3N3. Fitness traits measured in individuals across two filial generations are presented on the y-axes of each row. F1 adult sex ratio, F1 female clutch per day, and F2 egg hatchability are presented in boxplots showing each data point (grey dots), the median (black line within the interquartile range box), the mean (white diamond) and the bottom 25% and the top 25% of the data values (whiskers); reciprocal ♀ × ♂ crosses are presented in black boxes and their respective controls in light grey boxes. F1 female sterility is presented as the number of females (fecund females in light grey and sterile females in dark grey) with the percentage of sterile females in parenthesis. Letters above bars and boxes represent significant differences within each panel. Sample sizes, chi-square and F-statistics, and p-values are specified in Supplementary Tables 2 and 3.