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<br />UW;,h If <br /> <br />O~.~. <br /> <br />! <br /> <br /> <br />A PRELIMINARY ELECTROPHORETIC STUDY OF THE <br />COLORADO RIVER CHUB (PISCES: CYPRINIDAE, GENUS GILA) COMPLEX <br /> <br />~ <br /> <br />~ark J. Rosenfeld <br /> <br />Department of Biology <br /> <br />University of Utah <br />Salt Lake City, Utah 84112 <br /> <br />INTRODUCTION <br /> <br />Morphological variation among Colorado River chubs, the Gila <br /> <br />species complex (Cyprinidae), is poorly understood. <br /> <br />Prior to <br /> <br />alterations of the ecosystem, these fishes had received little <br /> <br />systematic study (Miller, 1946). The current classification is <br /> <br />based on few fish. The roundtail chub (~ robusta) was <br /> <br />described using an unspecified "several" specimens and the <br /> <br />bony tail chub (~. elcgans) from one individual (Baird anc <br /> <br />Girard, ll353a,b; Appendix 1). The humpback chub (~. cypha) was <br /> <br />designated a third species upon examination of two whole fish and <br /> <br />part of anoth2r one OHller, 19LI6). \..Jhether or not these morpho- <br /> <br />species are also real biological ones has not been resolved, yet <br /> <br />this taxonomy is the foundation upon which bony tail and hUMpback <br /> <br />chubs are protected and managed under the Endangered Species Act. <br /> <br />Mo~phological v2ridtio~ ~ithin the complex h3S resulted in a <br /> <br />[' 11 Q.- J <br />....,.,. " if 0 <br />