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Last modified
7/14/2009 5:02:35 PM
Creation date
5/22/2009 7:27:44 PM
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UCREFRP
UCREFRP Catalog Number
9443
Author
Bestgen, K. R., G. B. Haines, R. Brunson, T. Chart, M. Trammell, R. T. Muth, G. Birchell, K. Chrisopherson and J. M. Bundy.
Title
Status of Wild Razorback Sucker in the Green River Basin, Utah and Colorado, Determined From Basinwide Monitoring and Other Sampling Programs.
USFW Year
2002.
USFW - Doc Type
Project Number 22D,
Copyright Material
NO
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<br /> <br />Basinwide monitoring program sampling (Basinwide) began in 1996 with a goal to track <br /> <br />status and trends in abundance of razorback suckers in the Green River Basin of the upper <br />Colorado River Basin (Muth 1995; Muth et al. 1997). A Basinwide monitoring program was <br />deemed necessary to determine if restoration efforts were benefitting razorback suckers in the <br />Green River. This initial effort was focused only in the Green River but sampling techniques and <br />protocols may be applicable for monitoring razorback suckers throughout the upper Colorado <br />River basin. Sampling protocols used in this study for adults and early life stages were a <br />refinement of earlier work from 1992 to 1996, the rationale for which was discussed in Muth <br />(1995). Unfortunately, Basinwide monitoring program sampling produced relatively sparse data, <br />which made evaluation of status of razorback suckers in the Green River difficult. Sparse data <br />also limited our ability to develop and evaluate a monitoring program for razorback suckers, <br />which was a primary goal of this study. To bolster limited Basinwide program data, we <br />incorporated all available information from other sampling programs conducted during 1996 to <br />1999. This allowed us to make stronger inferences about the status of wild razorback suckers in <br />the Green River, which is the primary focus of this report. <br />STUDY AREA <br />The main study area was the Green River from the confluence of the Yampa River <br /> <br />downstream to the confluence with the Colorado River. A small number of fish were also <br />sampled in the lower portion of the Yampa, Duchesne, and San Rafael rivers during the course of <br />this program and in other studies. Channel morphology varied among canyon and valley reaches <br />of the Green River. In most canyon reaches, channel gradient was high, substrate was coarse, <br />2 <br />
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