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<br />14 <br /> <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 />Research Monitoring and Data Management <br /> <br />Valdez, RI. AI., R T. Muth2, and T. Czapla2 <br /> <br />'R. A. Valdez and Associates; US. Fish and Wildlife Service, 2Colorado River Endangered Fish Recovery <br />Program Office, Lakewood, Co <br /> <br />Summary of Population Estimate Workshop. The U.S. Fish and Wildlife Service (Service) <br />released draft recovery goals for the four Colorado River endangered fishes for public review <br />through a Notice of Availability in the Federal Register (66 FR 47033-47034) on September 10, <br />2001. These recovery goals provide site-specific management actions and objective, measurable <br />criteria for downlisting and delisting the Colorado pikeminnow (Ptychocheilus lucius), humpback <br />chub (Gila cypha), razorback sucker (Xyrauchen texanus), and bonytail (Gila elegans). <br />Demographic criteria include numbers of populations and individuals necessary for recovery. <br />Reliable, precise population estimates are needed to monitor population status and trends, to <br />determine if downlisting and delisting demographic criteria are met, and to ensure demographic <br />and genetic viability. The Service has determined that mark-recapture models provide the best <br />available population estimates. A workshop was held in Fort Collins, Colorado, on December 6-7, <br />2001, to solicit input from experts on the statistical validity and precision of population and <br />recruitment estimates for Colorado pikeminnow and humpback chub necessary to meet the <br />demographic criteria of the draft recovery goals; razorback sucker and bonytail will be addressed <br />at a later date. The purpose of the workshop was to provide guidance to the Service in <br />determining acceptable population and recruitment estimates for Colorado pikeminnow and <br />humpback chub. The workshop was attended by 35 researchers, statisticians, and representatives <br />of the Biology Committee of the Upper Colorado River Recovery Program, the Biology <br />Committee of the San Juan River Basin Recovery Implementation Program, and representatives <br />ofthe Grand Canyon Monitoring and Research Center. Presentations were made by individual <br />researchers for respective regions of river where population estimates are being conducted. <br />Following the presentations, a moderator solicited input from the attendees, and all information <br />was recorded on flip charts and electronically on a word processor. The results of the workshop <br />are presently being assimilated into a working document that will provide guidance for statistically <br />valid and precise population and recruitment estimates. <br /> <br />Kitcheyan, C.l, G. B. Hainesl, T. Moddel, G. Birche1l2, R Brunson2, M. Hudson3, S. Meisme~, <br />J. Hawkins4, and K. Bestgen4. <br /> <br />'Us. Fish and Wildlife Service, Colorado River Fishery Project Office, Vernal, UT; 2Utah Division of Wildlife <br />Resources, Vernal, UT; 3Utah Division of Wildlife Resources, Moab, UT; 4Colorado State University, Ft. Collins, <br />CO <br /> <br />Colorado pikeminnow sampling in the Green, White, and Yampa rivers, 2001 Sub-adult and <br />adult Colorado pikeminnow Ptychocheilus lucius were sampled on at least three occasions in <br />sections of the Green, White, and Yampa rivers in spring 2001. The goal ofthat sampling was to <br />gather capture-recapture information to generate abundance estimates of Colorado pikeminnow in <br />each river reach. The U. S. Fish and Wildlife sampled the Green River in Desolation Canyon and <br />the White River, Utah Division of Wildlife Resources sampled the lower and middle Green River <br />