Phylogenetic Relationships in the Genus Erimystax (Actinopterygii: Cyprinidae) Based on the Cytochrome b Gene
The phylogenetic and phylogeographic relationships of the North American cyprinid genus Erimystax were examined using sequences of the mitochondrial cytochrome b gene. Phylogenetic analyses were performed using parsimony and Bayesian approaches. Relationships within the genus were (((Erimystax cahni plus Erimystax x-punctatus)(Erimystax dissimilis plus Erimystax harryi))(Erimystax insignis))). Genetic distances among species were high and suggest that all speciation events occurred during the Miocene. Shallow divergence and wide geographic distribution in both E. x-punctatus and E. dissimilis suggest post-Pleistocene dispersal. Erimystax x-punctatus expanded its range northward into the upper Mississippi basin and eastward into the Ohio River basin from a putative Ozarkian refugium. Erimystax dissimilis expanded its range northward from a southern Appalachian refugium.Abstract
Ranges and sampling localities of Erimystax dissimilis, ⋆Erimystax insignis, •Erimystax x-punctatus, ▪Erimystax harryi. Erimystax cahni was excluded because of its extremely small range, which is overlapped by E. dissimilis and E. insignis
Bayesian consensus topology for the genus Erimystax. Posterior probabilities marked above nodes. Parsimony bootstrap values are below nodes. Outgroups are not shown. Number of identical haplotypes are indicated in parentheses. Abbreviations for sampled river systems: ARK Arkansas River, BLK Black River, CLI Clinch River, CUR Current River, DCK Duck River, GRN Green River, HAR Harpeth River, HIW Hiwassee River, MER Meramec River, OUA Ouachita River, POW Powell River, SEQ Sequatchie River, SHO Shoal Creek, SPR Spring River, STN Stones River, UIA Upper Iowa River, UOH Upper Ohio River, WAB Wabash River. Abbreviations for taxon names: EC Erimystax cahni, EXT Erimystax x-puntatus trautmani, EXX, Erimystax x. x-punctatus, ED Erimystax dissimilis, EH Erimystax harryi, EII Erimystax insignis insignis, EIE Erimystax insignis eristigma
Contributor Notes
University of Minnesota, Bell Museum of Natural History and Department of Fisheries, Wildlife, and Conservation Biology, 100 Ecology, 1987 Upper Buford Circle, St. Paul, Minnesota 55108. asimons@umn.edu