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Last modified
7/14/2009 5:02:37 PM
Creation date
5/20/2009 3:06:21 PM
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UCREFRP
UCREFRP Catalog Number
9690
Author
Recovery Implementation Program
Title
Recovery Implementation Program For Endangered Fish Species In The Upper Colorado River Basin 23rd Annual Recovery Program Researchers Meeting
USFW Year
2002
USFW - Doc Type
21
Copyright Material
NO
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />(ATPase 8, 6, and ND2) to serve as our genetic marker. Preliminary results indicate three major <br />clades. The largest consists of the mainstem Colorado, Virgin, Sevier, Bill Williams, and upper <br />Little Colorado rivers. Relationships within this large clade are relatively unresolved, but three <br />distinct Virgin River haplotypes are diagnosed. Furthermore, mainstem Colorado populations are <br />undifferentiated from WY to southern Grand Canyon. The second large clade represents the Gila <br />River, and is quite distinct from the mainstem Colorado. The third clade, the Lahontan, is most <br />divergent of all. Management implications are discussed. <br /> <br />Mueller, G'., and P. Marsh2 <br /> <br />JU.S. Geological Survey; 2Arizona State University <br /> <br />Lost, a Desert River and Its Native Fishes: A historical perspective of the lower Colorado <br />River. The authors describe historical conditions ofthe lower Colorado River through old <br />photographs and records. Few people appreciate the magnitude of change that has occurred in <br />the lower basin, especially through the loss ofthe Colorado Delta. Before high dams and storage <br />reservoirs, the river periodically flooded hundreds of square kilometers of floodplain and desert <br />playa. W. L. Minckley once suggested the core populations of razorback sucker (Xyrauchen <br />texanus), bonytail (Gila elegans), and Colorado pikerninnow (Ptychocheilus lucius) emanated <br />from the broader floodplain and oxbow habitats, much of that being found in the delta. The <br />Colorado delta and lower 125 miles of river has been lost to upstream water diversions and to the <br />plow. The river that remains more closely resembles the upper Mississippi or Missouri rivers both <br />physically and biologically. Ecological conditions and biotic communities from which native fish <br />evolved have been totally lost. In fact, the lower Colorado River has the dubious distinction of <br />being among the few major rivers of the world with an entirely introduced fish fauna. Regardless, <br />both Federal and state agencies are reintroducing endangered fish into these waters. It should not <br />come to anyone's surprise these traditional approaches are proving ineffective. <br /> <br />Posters and Displays <br /> <br />Snyder, D.E. <br /> <br />Larval Fish Laboratory, Colorado State University, Ft. Collins, CO <br /> <br />Descriptive Species Account for Larval and Early Juvenile Longnose Sucker, Catostomus <br />catostomus. The current guide to larval and early juvenile suckers of the Upper Colorado River <br />Basin (UCRB; Snyder and Muth 1990) covers six of the seven species found in the basin. <br />Longnose sucker (Catostomus catostomus) was not included because of budgetary limitations and <br />the improbability of encountering its larvae or early juveniles in Recovery Program collections. <br />However, with the collection of a significant number of juvenile longnose sucker and many larvae <br />suspected to be longnose sucker or hybrids in the lower Gunnison River in 1993, confidence in <br />identification of those and other suckers was compromised, and the need to comparably describe <br />and incorporate the last of the UCRB suckers in the guide and key became evident. Accordingly, <br /> <br />19 <br />
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