Following secondary contact, two distinct lineages of introduced European green crabs hybridized, forming a latitudinal genetic cline along the Eastern North American coast. Using a panel of 96 SNPs, Lehnert et al. show that this cline has continued to shift southward at a slower rate than previously predicted and suggest that neutral and selective processes contribute to cline dynamics, and ultimately, highlight how selection, hybridization, and dispersal can collectively influence invasion success.

Temporal dynamics of the genetic clines of invasive European green crab (Carcinus maenas) in eastern North America

Figure 4 from Lehnert et al. 2018