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<br />MODEL CALIBRATION <br />1 <br />The model was calibrated to existing estimates of Colorado squawfish abundance. The <br />' only estimates for adult Colorado squawfish were generated from mark-recapture <br />estimates in the Colorado River arm of the UCRB (Osmundson and Burnham 1996). <br />Estimates of abundances for the entire basin are more applicable for our purposes and <br />thou h data exists for mark-reca ture estimates for the whole basin, these estimates <br />9 p <br />' had not been made to date. Therefore, we incorporated athree-step process to <br />calibrate the model. First, we used Osmundson and Burnhams (1996) Colorado River <br />data base to determine if we could adequately model those observed dynamics. <br />Second, using the tagging data base and mark-recapture models, we estimated the <br />' total adult squawfish population for the entire Upper Basin. Finally, given the adult <br />population estimated for the Colorado River subpopulation, we recalculated the Upper <br />' Basin estimate for an upper subpopulation (those fish that spawn in the Yampa) and a <br />lower Green River subpopulation (near Green River, Utah). We then recalibrated the <br />model to give us the correct Upper Basin dynamics (in terms of population size), but in <br />a spatially explicit manner. That is, we set the model to correctly estimate all three <br />subpopulations in aggregate. <br /> <br /> <br /> <br />14 <br /> <br />