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Percina nigrofasciata

A summary of my work on Percina nigrofasciata can be easily described by the following abstract from my presentation at ASIH:

"The family Percidae, the second largest family of freshwater fishes in North America,
includes over 180 species, predominantly composed of darters. Only recently have the
relationships within Percina, the second largest genus of darters, been explored with
DNA sequence data. Percina nigrofasciata possesses one of the largest geographic ranges
within the genus and is widely distributed on the Gulf Coastal Plain. In 1956, a
morphological study by Crawford identified two subspecies within P. nigrofasciata: P.
nigrofasciata nigrofasciata, P. nigrofasciata raneyi
, and a zone of intergradation for
populations in the Altamaha and Savannah River system below the fall line. The
existence of multiple morphologically distinctive forms (2 subspecies and a zone of
intergradation) within P. nigrofasciata provides an excellent opportunity to examine the
phylogeographic relationships within this widespread taxon. I investigated genetic
variation within P. nigrofasciata using the cytochrome b gene in order to test Crawford's
morphologically based taxonomic designations. Results failed to recover the
monophyly of Percina nigrofasciata under maximum parsimony and Bayesian analyses,
and two distinct clades of blackbanded darters recovered in our study generally
correspond to the previously identified morphological groupings."
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