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European green crabs (Carcinus maenas) in the northeastern Pacific: genetic evidence for high population connectivity and current‐mediated expansion from a single introduced source population

Aim  The European green crab (Carcinus maenas) expanded dramatically after its introduction to the west coast of North America, spreading over 1000 km in < 10 years. We use samples of Carcinus maenas collected over time and space to investigate the genetic patterns underlying the species’ initial establishment and spread, and discuss our findings in the context of the species’ life history characteristics and demography.