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Systematics of the Blacktail Shiner (Cyprinella venusta) Inferred from Analysis of Mitochondrial DNA
Ásrún Ýr Kristmundsdóttir and John R. Gold
Vol. 1996, No. 4 (Dec. 27, 1996), pp. 773-783
Stable URL: http://www.jstor.org/stable/1447638
Page Count: 11
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We used mitochondrial DNA (mtDNA) restriction-site analysis to study systematics and biogeography of the blacktail shiner, Cyprinella venusta. MtDNA restriction sites were assayed from 20 populations of C. venusta collected from across its geographic range. Maximum-parsimony and neighbor-joining methods revealed four major, mtDNA-based phylogeographic clades (groups): these were termed Chocktawhatchee, Apalachicola, Mobile, and Western. The Western clade contained four distinct mtDNA lineages: Pearl-Pascagoula, Mississippi, East Texas, and West Texas. MtDNA phylogeographic subdivision within C. venusta is not strictly concordant with geographic subdivisions (ranges) of the three nominal subspecies (C. v. venusta, C. v. cercostigma, and C. v. stigmatura). MtDNA clades within C. venusta exhibited an east to west pattern of divergence across the Gulf Coastal Plain, with phylogenetic relationships among the clades inferred to be (Chocktawhatchee (Apalachicola (Mobile, Western))). Observed phylogeographic discontinuities involving the Apalachicola and Mobile clades corresponded to previously hypothesized zones of vicariance. Taxonomic revision of blacktail shiners may be warranted.