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Table 6.Backwater character variables showing significant differencesa betwee <br />used by Colorado squawfish and those not used by Colorado squawfish i <br />River at Ouray NWR: 1990-1996. <br /> Mean Value <br />Variable measured Probability ~CS present CS absent <br />uarea (m2) p<0.01 992.36 404.41 <br />percent cover p<0.01 (0.019 0.045 ~~ <br />mean depth (m)b p<0.01 0.33 0.24 <br />length (m) <0.01 <br />p <br />61.92 ~ <br />33.99 <br />mean depth of substrate (m)b p<0.01 0.07 0.04 <br />mean water temperature (°C)b <br />summer p<0.01 1 26.8 25.8 <br />difference between backwater and <br />main channel water temperature <br />( °C) b spring p<0.01 ~ <br />~ <br />~ 2.0 3.1 ~~ <br />volume (;m3) p<0.01 434.44 194.00 <br />mean width (m)b <0.01 <br />p <br />13.48 ~ <br />7.92 <br />a Wilcoxon rank-sum test <br />b all individual measures contributing to calculation of the mean were also si <br />