Figure 1.

Courtship latency. Means ± SEs (in seconds) of the lengths of courtship latency in crosses involving flies from the same or different populations in Experiment 1. Each cross type is represented by the letters O (Oulanka) and V (Vancouver), with the female parent listed first. Sample sizes are indicated inside the bars and different letters above error bars indicate significant differences between means based on Kruskal-Wallis tests.