Journal Article

Allozymic Divergence and Systematics of the Rio Grande Silvery Minnow, Hybognathus amarus (Teleostei: Cyprinidae)

URL: https://webapps.usgs.gov/mrgescp/documents/Cook%20et%20al._1992_Allozymic%20Divergence%20and%20Systematics%20of%20the%20RGSM%2C%20Hybognathus%20amarus%20%28Teleostei%20Cyprinidae%29.pdf

Date: 1992/01/01

Author(s): Cook J.A., Bestgen K.R., Propst D.L., Yates T.L.

Publication: Copeia, v. 1992(1), p. 36-44

Abstract:

Hybognathus amarus, a cyprinid endemic to the Rio Grande drainage, has had a confused taxonomic and systematic history. We examined allozymic variation for 22 presumptive gene loci for two populations each of H. amarus, H. hankinsoni, and H. placitus and one population of H. nuchalis. Dionda episcopa, Pimephales promelas, and Campostoma anomalum were included as outgroups. Nei's (1978) genetic distance values were greater than 0.111 for all species pairwise comparisons in this study; intraspecific comparisons yielded genetic distances less than 0.005. Phenetic and phylogenetic analyses corroborated the hypothesis that H. amarus is a valid taxon, separate from H. nuchalis and H. placitus with which it was previously included.