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Last modified
8/11/2009 11:32:56 AM
Creation date
8/10/2009 3:53:52 PM
Metadata
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Template:
UCREFRP
UCREFRP Catalog Number
7740
Author
McAda, C. W. and L. R. Kaeding.
Title
Physical Changes in the Gunnison and Colorado Rivers Resulting from Construction of the Aspinall Unit and Related Projects, with Hypotheses to Assess the Effects on the Endangered Fishes
USFW Year
1991.
USFW - Doc Type
Final Report.
Copyright Material
NO
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<br /> <br />of 284 razorback suckers in the Grand Junction area from 1974 to 1976. <br />However, very few were collected during the late 1980's (summarized by <br />Osmundson and Kaeding 1990). Although some of this decline may be related to <br />habitat change at the Walker Wildlife Area where Kidd (1977) and McAda and <br />Wydoski (1980) collected most of their fish and to decreased sampling <br />intensity, the abrupt population decrease appears real. Intensive sampling by <br />the Fish and Wildlife Service and Colorado Division of Wildlife in ?_989 and <br />1990 collected only 3 razorback suckers in the Colorado River (Kaeding and <br />Osmundson 1990; Bob Burdick, personal communication). Wiltzius (1978) <br />collected one razorback sucker from the Gunnison River in 1975, but Valdez et <br />al. (1982a) did not collect any during 1979 to 1981. Although razorback <br />suckers are not presently found in the Gunnison River above Redlands Diversion <br />Dam, suitable habitat still remains (E. Wick, personal communication). <br />Humpback chub <br />No historical distribution and abundance data exist for humpback chub <br />because the species-was not described until 1946 (Miller 1946). Humpback chub <br />were first collected in the upper Colorado River in 1974 at Black Rocks, <br />upstream from the Utah-Colorado border (B. Burdick, personal communication). <br />Additional populations were later discovered in Westwater and Cataract canyons <br />(Valdez et al. 1982b). Recent studies (Kaeding et al. 1990) suggest that the <br />populations are small and disjunct, but relatively stable. Although Valdez et <br />al. (1982a) extensively sampled the Iower Gunnison River from 1979 to 1981, <br />they did not collect any humpback chub. <br />8 <br />
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