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Last modified
7/14/2009 5:01:45 PM
Creation date
5/20/2009 1:40:42 PM
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UCREFRP
UCREFRP Catalog Number
7378
Author
Wydoski, R. S.
Title
Potential Impacts of Alterations in Streamflow and Water Quality on Fish and Macroinvertebrates in the Upper Colorado River Basin.
USFW Year
1980.
USFW - Doc Type
77-147
Copyright Material
YES
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<br />- <br /> <br />_"""''''..'''''''''"....''''''''''w'''',r.,~~_._, "',,,_.,, ^-_. <br /> <br />n <br /> <br />81 <br /> <br />of allocating a flow resource in such a way as to satisfy legally pre- <br /> <br /> <br />ferred current demands without foreclosing nhe satisfaction of a differ- <br /> <br /> <br />ent set of configuration of demands in the future, When so viewed. it <br /> <br /> <br />is clear that there will be no single or final solution to the problema <br /> <br /> <br />of allocation and management in the Colorado River Basin, The time for <br /> <br /> <br />seriously addressing the emerging generation of problems. however, 1s <br /> <br />now." <br /> <br />This paper summarizes the present knowledge of the effects of var- <br /> <br />ious management practices on fish and macroinvertebrates in the Upper <br /> <br />Colorado River. attempts to identify future effects of alterations in <br /> <br />streamflow and water quality on these animals. and offers recommenda- <br /> <br />tions for future research, <br /> <br />Fish Fauna of the Upper Colorado River Basin <br /> <br />~r <br /> <br />The Colorado River Wildlife Council listed fifty species and four <br /> <br /> <br />subspecies of fish in the Upper Colorado River (Richardson. 1976). <br /> <br /> <br />Twenty of these species (40 percent) and the four subspecies are native <br /> <br />to one or more states in the upper basin. but some have been introduced <br /> <br /> <br />into other states, Thirty species (60 percent) have been introduced at <br /> <br /> <br />various times into the river system. In a recent study by the Utah <br /> <br /> <br />Cooperative Fishery Research Unit. twenty-nine species of fish were re- <br /> <br /> <br />corded in the major tributaries to the Upper Colorado River (Holden and <br /> <br /> <br />Stalnaker. 1975). Ten of these species (34,5 percent) were native to <br /> <br /> <br />tbe river and nineteen were introduced, Other investigators have re- <br /> <br /> <br />ported a bigh perce~tage of introduced species in the lower basin as <br /> <br /> <br />well (Minckley and Deacon. 1968). <br /> <br />
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