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23 24 25 LIST OF TABLES (cont.) Tab 1 e 13 Adult insect emergence dates for the Kootenai and Fisher rivers. . . . . . . . .. . . . . . . . . . . . . . . 14 Sum of the mean daily temperatures in centigrade by month, season and year for water years 1979 and 1980 in the Kootenai and Fisher rivers. . . . . . . . . . . . . . . . . . . . . 15 Mean head capsule widths of V~unella 6lavitinea in Kootenai and Fisher rivers. The standard deviation is in parentheses after the mean and the number of head capsules measured is given below the mean. . . . . . . . . . . . . . . Shannon Diversity Indices, Kootenai River and Fisher River in sec t samp 1 e s. . . . . . . . . . . . . . . . . . . . . . . Values (mean and standard deviations of six samples) obtained on the primary axis using three community ordination techniques - detrended correspondence analysis (DECORANA), polar ordination (P.O.), and principal components analysis (P.C.A.). Eigenvalues (Eig. = amount of the variation explained by the first axis = % Ev) . . . . . . . . . . . . . . . .. ....... 16 17 18 Periphyton biomass measured as ash free dry weight (AFDW) and chlorophyll! (Chl !) . . . . . . . . . . . . . . . . . . . 19 Measurements of periphyton productivity in Kootenai, Fisher and Flathead rivers, September, 1981 in milligrams of oxygen per meter per day . . . . . . . . . . . . . . . . Four size fractions of particulate organic carbon (PaC) in the seston of three stations in Kootenai River. . . . . . . . . 20 21 Measurements of surface rocks (number measured, mean size) and subsurface rocks (mean gra i n si ze, heterogeneity index ( Sc hwoe rbe 1 1961) . . . . . . . . . . . . . . . . . . 22 Pearson correlation matrix for seasonal data, Kootenai River s ta t i on s. . . . . . . . . . . . . . . . . . . . . . . Pearson correlation matrix for seasonal data, Kootenai and Flathead rivers. . . . . . . . . . . . . . . . . Pearson correlation matrix for annual means and fall data, Kootenai and Flathead rivers. . . . . . . . Mean monthly drift densities in number of insects per 100 cubic meters of flow at Elkhorn and Pipe Creek site s on Kootena i River compared to mean daily flow for 14 days prior to insect samp 1 i ng. . . . . . . . . . . . . . . . . . . . . . . . . . . . v Page 34 38 40 42 43 46 48 51 56 59 60 62 64