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Last modified
7/14/2009 5:01:46 PM
Creation date
5/20/2009 1:35:53 PM
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UCREFRP
UCREFRP Catalog Number
7813
Author
Vanicek, C. D., R. H. Kramer and D. R. Franklin
Title
Distribution of Green River Fishes in Utah and Colorado Following Closure of Flaming Gorge Dam
USFW Year
1970
USFW - Doc Type
The Southwestern Naturalist
Copyright Material
YES
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<br />'. . <br /> <br />~'J <br /> <br />. <br /> <br />. <br /> <br />~ <br /> <br />e <br /> <br />.- <br /> <br />.. <br /> <br />",.,..~_.-....._-_..,.,-,... .....---.---"..,-.... <br /> <br />e <br /> <br />to have occurred in Dinosaur National Monument prior to impound- <br />ment except the humpback chub, which was never common here, were <br />readily collected from the river in this lower area of the Monument. <br />Several species (in addition to rainbow and brown trout) were col- <br />lected that were not taken in the five pre-impoundment collections. <br />These were mountain whitefish, Utah chub, creek chub, white sucker, <br />and green sunfish. With the exception of mountain whitefish, these <br />species are l:Iet exotics. The occurrence of these fishes probably reflects <br />the more intensive sampling efforts in the present study rather than <br />any change in fish populations. Miller (1964) has reported finding <br />creek chub at Echo Park in 1963 and green sunfish at Island Park in <br />1962. <br />The humpback chub, whose taxonomic status needs further study <br />(Smith, 1960), was collected only in 1963, the first year of this investi- <br />gation. Three specimens were collected. One was taken at Echo Park <br />and was apparently a bona fide humpback chub. The other two were <br />extremely humped forms which closely resemble Gila cypha. One was <br />taken at Island Park and the other at Swallow Canyon, above Dinosaur <br />National Monument. Little is known of the morphological variability <br />of G. robusta or G. cypha, and the identification of these two specimens <br />remains tentative. <br />Although Azevedo (Unpublished fishery management report, Bu- <br />reau Sport Fisheries and Wildlife), Hagen (1962), and Hagen and <br />Banks (1963) reported taking humpback chubs in Dinosaur National <br />Monument before closure of Flaming Gorge Dam, none of these fish <br />was positively identified. Many of the problems related to the question <br />of the pre-impoundment distribution of the humpback chub will <br />remain unsettled until its taxonomic status is better understood and <br />criteria for positive identification are established. Humpback chubs <br />were listed, however, among the fishes collected by Gaufin, Smith, and <br />Dotson (1960) in the reservoir basin (above the present study area) <br />before inipoundment. <br />On the basis of numbers of fishes taken in the present study, the two <br />most abundant species in the Green River in Dinosaur National Monu- <br />ment were redside shiners and speckled dace, while the species com- <br />prising the greatest biomass was the flannelmouth sucker. Smith <br />(1960) reported that the redside shiner was the most common species <br />in Flaming Gorge Reservoir basin prior to impoundment, and that the <br />speckled dace was the most abundant native species. <br />The primary factor responsible for the major change in the fish <br />fauna in this area was most likely the change in water temperature <br />imposed by the dam. Since impoundment, water temperatures at least <br /> <br />312 <br /> <br />'.. " <br /> <br />to <br /> <br />, <br /> <br />, <br /> <br />'l' <br />
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