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older Colorado River-derived stock largely supplanted by a <br />subsequent invasion of G. r. robusta from that drainage, <br />except where natural barriers were provided. Lends less <br />credence to the hypothesis that grahami may have arose <br />through introgressive hybridization of robusta and <br />intermedia. <br />1975. Cross, J.N. Ecological distribution of the fishes of the <br />Virgin River. Ms. Thesis, Univ. Nev. Las Vegas. 187 p. <br />Provides a brief recapitulation of the taxonomic history of <br />Gila robusta seminuda. <br />1975. Wick, E.J. Gila cvpha, the humpback chub: Can it be saved <br />or is it doomed to extinction? Colo. St. Univ, Ft. Collins. <br />14 p. <br />Discusses the discovery of the Ruby Canyon (=Black Rocks <br />area) humpback chub population in the Colorado River and <br />speculates based on appearence that they represented a <br />population of "pure or virtually pure" cvpha. <br />1975a Holden, P.B., and C.B. Stalnaker. Distribution and <br />abundance of mainstream fishes of the middle and upper <br />Colorado River basins, 1967-1973. Trans. Amer. Fish. Soc. <br />104:217-231. <br />Does not contain a taxonomic discussion but refers to the <br />"humpback chub complex", aside from robusta and elegans, <br />indicating that they perceived some element of polytypy in <br />these fishes (see Joseph et al., 1977, below). <br />1976. Kobetich, G.C., and P.B. Holden. The rare fishes of the <br />Colorado River basin. Paper presented-W. Div. Am. Fish. <br />Soc., Sun Valley, ID. <br />(Not seen). Presents a discussion of Gila spp. in the <br />Colorado basin and proposes a hypothesis whereby G. cvpha <br />was hybridizing with other species prior to habitat <br />alterations by man (abstracted in Ecology Consultantsl, Inc., <br />1977). <br />1976. Rinne, J.N. Cyprinid fishes of the genus Gila from the <br />lower Colorado River basin. Wasmann J. Biol. 34:65-107. <br />Contains a taxonomic treatment (presumalby based on Rinne, <br />1969) of lower basin Gila focusing primarily on the G. <br />robusta complex and G. intermedia. Details variation within <br />and between the various forms. Resurrects grahami as valid <br />subspecies for forms formerly thought to possibly represent <br />10