“…Several studies, at the regional scale, indicate an important gene flow between populations of S. calcitrans despite the natural geographic barriers (Gilles et al, 2007;Dsouli-Aymes et al, 2009). Jones et al (1991), Krafsur (1993) and Szalanski et al (1996) showed a low differentiation among S. calcitrans populations in the United States.…”