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<br />254
<br />
<br />The Southwestern Naturalist
<br />
<br />vol. 36, no. 2
<br />
<br />could be due to phenotypic variation, the rela-
<br />tively smaller sizes and young age of chub col-
<br />lected from these areas, or hybridization with
<br />other Gila species.
<br />The Little Snake River exemplifies the vari-
<br />ation in discharge under which native fishes
<br />evolved in the Colorado River System. The can-
<br />yon in the lower 12 km of the Little Snake River
<br />represents important local habitat for native fish-
<br />es and should be protected. Natural flow regimes
<br />should be maintained in the Little Snake River
<br />to preserve this potentially important tributary
<br />habitat for native fishes. Useful information on
<br />distribution, taxonomy, and behavior of endan-
<br />gered fishes may be obtained from further study
<br />of the Little Snake River and other tributaries in
<br />the Upper Colorado River System.
<br />Funds to conduct radiotelemetry surveys were
<br />provided by the United States Bureau of Recla-
<br />mation, Salt Lake City, Utah. Funding for field
<br />collection of fish and discharge measurements was
<br />provided by the Colorado Division of Wildlife
<br />through Study No. SE-3-12, Endangered Fishes
<br />Investigations. H. Tyus and K. Paulin of the
<br />United States Fish and Wildlife Service, Vernal,
<br />Utah, contributed equipment and field assistance.
<br />E. Wilson and R. Teller of the United States
<br />Geological Survey, Meeker, Colorado, provided
<br />discharge data for the Little Snake River. H.
<br />Copeland and D. Wick assisted in field collec-
<br />tions. R. Behnke, K. Bestgen, C. Carlson, and R.
<br />Muth provided helpful reviews during prepara-
<br />tion of the manuscript.
<br />
<br />LITERATURE CITED
<br />
<br />HAYNES, C. M. 1980. Endangered humpback chub
<br />range extension documented. Endangered Species
<br />Tech. Bull., 5(10):35.
<br />HOLDEN, P. B. 1973. Distribution, abundance, and
<br />life history of the fishes of the Upper Colorado River
<br />Basin. Unpubl. Ph.D. dissert., Utah State Univ.,
<br />Logan, 59 pp.
<br />HOLDEN, P. B., AND E. J. WICK. 1982. Life history
<br />and prospects for recovery of Colorado squawfish.
<br />Pp. 98-108, in Fishes of the Upper Colorado River
<br />system: present and future (W. H. Miller, H. M.
<br />Tyus, and C. A. Carlson, eds.). Amer. Fish. Soc.,
<br />Western Div., Bethesda, Maryland, 131 pp.
<br />McKEOWN, B. A. 1984. Fish migration. Timber
<br />Pres!J, Be'averton, Oregon, 224 pp.
<br />SEETHALER, K. 1978. Life history and ecology of the
<br />Colorado squawfish PtychocheiLus Lucius in the Up-
<br />per Colorado River Basin. Unpub1. M.S. thesis,
<br />Utah State Univ., Logan, 156 pp.
<br />UGLAND, R. C., B. J. COCHRAN, R. G. KRETSCHMAN,
<br />E. A. WILSON, AND J. D. BENNETI. 1989. Water
<br />resourCeS data, Colorado, water year 1988, V 01. 2.
<br />Colorado River Basin. U.S. Geol. Surv. Water-data
<br />Rept., CO-88-2:1-370.
<br />VALDEZ, R. A., AND G. H. CLEMMER. 1982. Life
<br />history and prospects for recovery of the humpback
<br />and bony tail chub. Pp. 109-119, in Fishes of the
<br />Upper Colorado River system: present and future
<br />(W. H. Miller, H. M. Tyus, and C. A. Carlson,
<br />eds.). Amer. Fish. Soc., Western Div., Bethesda,
<br />Maryland, 131 pp.
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