Conclusions
Studies examining the evolutionary outcomes of hybridization along space and time are necessary to understand whether hybridization outcomes represent general patterns or are species and context specific. In this study, we provide evidence for on-going hybridization and bidirectional backcrosses, with different admixture-class distributions in different damselfly hybrid regions which may in part be explained by 1) proximity to introduction site, 2) local dynamics, 3) the strength of reproductive barriers, and 4) the time elapsed since colonization. We also provide evidence of increased genetic diversity and reduced genetic differentiation in a range expansion when opportunities for hybridization occur.