at the .01 probability level in both analysis. The partial
sums of squares shows significance at .01 for the following
-variables: pH, alkalinity, nitrates, hardness, and water
depth- Significance at .05 was indicated for phosphates,
lake or stream variable, and Vogtia, The partial sums of
squares with only insect variables included showed signifi-
cance at .01 for Vogtia and no significance for Agasicles
(Table 17).
Table 17. ANOV for Stem density.
Source DF SS MS F Prob F
Regression 12 384.94 32.08 8.97 0.0001
Error 274 980.08 3.58
Corrected 286 1365.02
Total
Source DF Partial SS F Prob F
pH 1 40.77 11.40 0.00
Alkalinity 1 27.51 7.69 0.01
Iron 1 6.66 1.86 0.17
Turbidity 1 7.06 1.97 0.16
Chlorides 1 0.10 0.03 0.86
Phosphates 1 14.88 4.16 0.04
Nitrates 1 64.42 18.01 0.00
Hardness 1 71.90 20.10 0.00
Water depth 1 53.29 14.90 0.00
Lake or Stream 1 14.43 4.03 0.04