The third canonical variable indicates a negative
relationship between the number of stems and water hardness.
This, in conjunction with the second variable suggests that
water/hardness is normally associated with stems of larger
diameter and of lower density as opposed to a larger number
of stems of smaller size. Also important in this relation-
ship is the positive association between water depth and
stem density, indicating that as depth increases stem density
increases as well. Another part of this association is a
positive relationship between stem diameter and pH, phosphates
and alkalinity, indicating that as these variables increase,
the diameter of the stems increase similarly.
The fourth variable shows a negative relationship
between turbidity and internode diameter similar to the
second variable, and a positive relationship between tur-
bidity and internode length.. The .latter relationship would
be expected since a positive relationship has been shown
between turbidity and plant height. Internode length and
plant height are almost certainly related.
Comparison of lakes and streams
To determine if there was statistically significant
difference between alligaterweed growths in lakes and
streams a canonical discriminant analysis was utilized to
compare the 287 samples and group them according to their
origin (Cooley and Lohnes 1970). Three of the four plant
characteristics were significant between the two groups at
the .01 level of probability. These were: internode