Intraspecific Phylogeography of Graptemys ouachitensis
Intraspecific phylogeography of the Ouachita Map Turtle (Graptemys ouachitensis) was examined using a 620 base pair sequence of the mitochondrial control region from 64 individuals sampled from populations across the species range. G. ouachitensis ouachitensis occupies the Mississippi River drainages as well as two disjunct populations in the Scioto River, Ohio and the Kanawaha River, West Virginia. A minimum spanning network subdivided 16 haplotypes into three haplotype groups that overlapped throughout the species range. The genetic differentiation observed between the haplotype groups suggests a vicariant event during the late Pliocene or early Pleistocene. The lack of genetic differentiation within the haplotype groups, and the widespread distribution of two of the groups, provides evidence for a dispersal event following the Pleistocene glaciation. The Scioto River, Ohio population is genetically similar to the rest of the populations and became inhabited by two of the three haplotype groups in a dispersal event following the glaciation. The two subspecies, G. o. ouachitensis and G. ouachitensis sabinensis, have low levels of genetic differentiation.
School Location:USA - Ohio
Source Type:Master's Thesis
Keywords:vicariance mississippi river drainage mitochondrial dna control region biogeography
Date of Publication:01/01/2008