Figure 1.

Distribution of fecundity across inbred lines of Tigriopus californicus. Fecundity was measured as the number of larvae hatching from a female's first brood. Data points are means ± s.e.m. for each experimental line. Population abbreviations are as listed in table 1. The horizontal dashed line separates hybrid samples according to their fitness level, using the lowest parental mean (n = 14 hatchlings) as threshold. Reciprocal crosses (e.g. SD♀ × SC♂ and SC♀ × SD♂) are pooled under the same designation (SD × SC).