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Last modified
7/14/2009 5:02:29 PM
Creation date
5/24/2009 7:08:21 AM
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UCREFRP
UCREFRP Catalog Number
7300
Author
Tyus, H. M. and C. A. Karp.
Title
Habitat Use and Streamflow Needs of Rare and Endangered Fishes, Yampa River, Colorado.
USFW Year
1989.
USFW - Doc Type
Biological Report 89(14),
Copyright Material
NO
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Preface <br />The decline of the native Colorado River fish fauna is a biological indicator of dramatic environmental change <br />and the potential loss of a unique natural resource. This decline is associated with human population expansion <br />and associated water development in the West, limited interest in nongame fish biology, and a lack of a conservation <br />ethic for fishes of western deserts. For these and other reasons, management and recovery options have been <br />difficult to develop for rare fishes in the Colorado River basin. Only recently have substantive life cycle and habitat <br />use information of these fishes become available and their requirement for large and diverse habitats been <br />recognized. <br />Flow and nonflow management measures for the rare Colorado River fishes are currently being developed based <br />on provisions inherent in Section 7 of the Endangered Species Act. Since passage of that Aet in 1973, the <br />proliferation of literature and symposia concerning recovery of the Colorado River fishes reflects the keen interest <br />in their management and recovery. <br />Major conflicts between various water development groups, the U.S. Fish and Wildlife Service, and others <br />regarding the cumulative effects of water development projects on recovery of the rare fishes led to the formation <br />of the rnultiagency Upper Colorado River Basin Coordinating Committee in 1984. Active participants include the <br />U.S. Fish and Wildlife Service; U.S. Bureau of Reclamation; States of Colorado, Utah, and Wyoming; private water <br />development interests; and environmental groups. Cooperation of these diverse interests demonstrates the <br />complexity involved in recovery of the rare Colorado River fishes. <br />In 1987 the Upper Colorado River Basin Coordinating Committee produced a Recovery Implementation <br />Program for recovering the rare fishes of the upper Colorado River basin. The ultimate goal of this program was <br />to recover and delist the Colorado squawfish (Ptychoclaeilus hieius), humpback chub (Gila cypha), and bonytail <br />chub (G. elegafts). In addition, management options would be developed for the razorback sucker (X}~rai~cJten <br />texarttts) so that protection under the Endangered Species Act would not be needed. <br />One element of the Recovery Implementation Frogram is the protection of streamflow needs of the listed fishes. <br />In meeting this goal, the Yampa River has been assigned highest-priority for water rights acquisition. As the only <br />large river in the upper Colorado River basin in which flow patterns have not been substantially altered by water <br />development projects, the Yampa River is considered important for the maintenance and recovery of existing <br />populations of rare Colorado River fishes. <br />In 198$, the Upper Colorado River Basin Coordinating Committee requested that streamflow requirements of <br />the rare fishes in the Yampa River be quantified to aid water acquisition in line with the goals of the Recovery <br />Implementation Program. Atwo-step process was subsequently outlined, (1) evaluation of habitat use, potential <br />limiting factors, and general flow needs (i.e., relation between life cycle and annual flow events) of the four fish <br />species; and (2) quantification of the identified needs with respect to quantity, duration, and timing of flows. The <br />present report fulfills step 1: it is an evaluation of habitat use and streamflow requirements of the Colorado <br />squawfish, humpback chub, bonytail chub, and razorback sucker in the Yampa River. <br />Ouestions regarding technical material' in this report maybe addressed to the authors. Additional information <br />regarding the. Recovery Implementation Frogram may be obtained from Colorado River Coordinator (FWE), iJ.S. <br />Fish and Wildlife Service,. F.O, $o~ 25486, Denver Federal Center, Denver, Colorado 8x225. <br />iv <br />
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