Figure 3From: Sexual and postmating reproductive isolation between allopatric Drosophila montana populations suggest speciation potentialCopulation duration. Means ± SEs (in seconds) of copulation duration 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.Back to article page