Fig. 3: Swimming performance traits (a–d) of hatchlings reared at two soil treatments (dry and wet) in within- and between-population crosses of four populations.

Traits were measured for 633 tadpoles (Supplementary Table 2). The first letter of the parental origin represents the female (population) origin, and the second letter represents the male origin. Mean responses (large white or black circles, according to treatment) are superimposed over boxplots, which are superimposed over raw data (jittered small blue circles). Lower and upper boxplot boundaries are 25th and 75th percentiles, respectively, the thicker line inside the box is the median value, and lower and upper error bars are 10th and 90th percentiles, respectively.