Gypsum soil restriction drives genetic differentiation in <i>Fouquieria shrevei</i> (Fouquieriaceae)

Abstract

We conclude that genetic drift has been intense and gene flow low in differentiating populations that follow an island-like pattern of gypsum deposits of the deserts of North America. The interaction between these forces could promote speciation events that in turn would increase regional diversity and may explain the high number of narrow endemics associated with soil restrictions.