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TABLE 1. Comparison of zooplankton. abundance (mean number/liter) in Flaming <br />Gorge Reservoir 1965-1966 and 1983. Sample size 1965-66 = 36/month, <br />1983 = 72/month (*indicates significant difference at p < 0.05, t-test). <br /> 1965-66 1983 t-test <br />Daphnia Apr 20.9 3.8 * ` <br /> May 32.3 18.0 <br /> Jun 237.8 22.3 <br /> Jul 37.4 8.3 <br /> Aug 20.9 5.0 <br /> Sep 20.6 4.5 * <br /> Oct 22.0 5.2 <br />Diaptomus Apr 8.1 1.6 <br /> May 30.2 5.8 <br /> Jun 20.7 13.6 <br /> Jul 45.1 6.7 <br /> Aug 29.6 14.9 <br /> Sep 14.6 5.2 <br /> Oct 6.2 2.5 <br />Cyclops Apr 17.9 6.3 <br /> May 22.8 18.8 <br /> Jun 72.4 17.5 <br /> Jul 36.2 8.5 <br /> Aug 4.1 7.5 * <br /> Sep 1.6 4.8 <br /> Oct 2.8 8.7 <br />Polyartha Apr 34.3 1.3 <br /> May 82.6 5.4 <br /> Jun 32.6 36.1 <br /> Jul 30.0 8.5 <br /> Aug 6.9 14..9 <br /> Sep 9.6 8.7 <br /> Oct 7.4 10.9 <br />Kellicottia Apr 0 i.2 <br /> May 0 1.6 <br /> Jun 0 2.5 <br /> Jul 0 0.2 <br /> Aug 0 0.3 <br /> Sep 0 0.7 <br /> Oct 0 0.5 <br />16 <br />