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Last modified
7/14/2009 5:01:44 PM
Creation date
5/22/2009 12:26:47 PM
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UCREFRP
UCREFRP Catalog Number
7068
Author
Bishop, B. A. and D. B. Porcella.
Title
Physical and Ecological Aspects of the Upper Colorado River Basin.
USFW Year
1980.
USFW - Doc Type
17-55
Copyright Material
YES
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<br />HDwever~ brown trout are more tolerant of degraded conditions and can <br /> <br />tolerate adverse conditions b~tter than native species. <br /> <br />Introduced species such as carp and channel catfish are ubiquitous <br /> <br />in the main channels. Although such species have more generalized habi- <br /> <br />been divided into the hydrologic subbasins specified in table 7. In the <br /> <br />table, physical characteristics, population parameters by water resources <br /> <br />subareas (U.S. Water Resources Council, 1972), potential energy deve1op- <br /> <br />ments, salinity and other water quality problems have been identified <br /> <br />tat requirements, they are not necessarily indicators of polluted con- <br /> <br />ditions either. These exotics may compete with native species when en- <br /> <br />vironmental needs are in short supply or conditions exist which are criti- <br /> <br />and related to specific land uses and habitat areas such as national <br /> <br />forests and parks, recreational activities and sites, and to endangered <br /> <br />species protected by the Endangered Species Act of 1973 (PL 93-205). <br /> <br />cal to a stage in their life cycle. Also, adults of the native species <br /> <br />The activities of society and their impacts on land and water qual- <br /> <br />may be able to survive the new conditions, but reproductive success may <br /> <br />be reduced or eliminated and the species may disappear after some lengthy <br /> <br />ity produce changes in beneficial uses as a result of chemical, biologi- <br /> <br />cal, and physical disturbances in the ecosystem. For example, in sub- <br /> <br />basin UM7 (Gunnison River above Gunnison, Colorado) there are large areas <br /> <br />interval of time. <br />Although documentary evidence is far from complete, it is clear that <br /> <br />fish and invertebrate fauna in the Colorado River Basin have undergone <br /> <br />of national forest with its multiple uses and areas of trout fishing pro- <br /> <br />viding considerable economic and recreational benefits. The problem of <br /> <br /> <br />dissolved oxygen depletion caused by wastewater discharges and the prob- <br /> <br /> <br />lem of toxic heavy metals and acid discharges from abandoned mines have <br /> <br /> <br />caused significant loss of stream habitat and hence loss of beneficial <br /> <br />dramatic alterations. Native species depletion and in some cases extinc- <br /> <br />tion is widespread throughout the basin, resulting in large-scale species <br /> <br />b t. f a These faunal changes are perhaps best evi- <br />replacement y exo ~c aun. <br />denced by the significant basin-wide increases in species diversity due <br /> <br />to alien introduction in conjunction with the changing quality of water. <br /> <br />use. <br /> <br />Examining table 7 from an overall perspective, the three major dis- <br /> <br />Environmental Research Needs for <br />the Upper Colorado River Basin <br /> <br />ruptions to environmental systems from energy development activities are <br /> <br />habitat destruction, alteration of streamflows, and pollution loading. <br /> <br />Energy Activities and Environmental Problems <br />Physical characteristics of development activities, air and water <br /> <br />discharges and their locations, and aquatic and terrestrial ecosystem <br /> <br />quality are all interrelated aspects of the environment affecting fish <br /> <br />and wildlife in the Upper Colorado River Basin. To assess problem areas <br />and corresponding research needs for the Colorado River, the basin has <br />. <br /> <br />Habitat Loss. Habitat destruction from such activities as stream <br /> <br />alteration, dam construction, water diversions, processing plants, energy <br /> <br />development, etc., will affect environmental quality. Destruction of <br /> <br />aquatic habitat will greatly affect the spawning grounds for fish. Min- <br /> <br />ing near some of the higher mountain tributaries could cause habitat des- <br /> <br />truction and metal toxicity to aquatic organisms. <br /> <br /> <br />- <br />~ <br />- <br />~ <br />, <br /> <br />~ <br />~ <br />C <br /> <br />. <br />~ <br />= <br />~ <br />> <br />- <br />~ <br />~ <br />
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