Westward range expansion from middle latitudes explains the Mississippi River discontinuity in a forest herb of eastern North America

Carly Prior, Nate Layman, Matthew Koski, Laura Galloway & Jeremiah Busch
It is often expected that temperate plants have expanded their geographic ranges northward from primarily southern refugia. Evidence for this hypothesis is mixed in eastern North American species, and there is increasing support for colonization from middle latitudes. We studied genome-wide patterns of variation in RADseq loci to test hypotheses concerning range expansion in a North American forest herb (Campanula americana). First, spatial patterns of genetic differentiation were determined. Then phylogenetic relationships and divergence times...
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