57 



untransformed values did. Table 4 shows that concentrations and 

 log-transformed accumulation rates of both periphyton (Fig. 5) and 

 plankton (Fig. 6) were positively correlated with TSI(AVG). pH, an 

 important correlate of TSI, was found to be negatively correlated 

 with the proportion of periphyton and positively correlated with the 

 proportion of plankton in recent sediments of survey lakes. pH was 

 also positively correlated with the log-transformed concentrations 

 and accumulation rates of plankton. Chi a, total N and Secchi depth 

 values used to calculate TSI(AVG) are shown in Appendix 4. 

 Appendix 6 lists the proportions, sedimentary concentrations and 

 accumulation rates of periphyton and plankton in the survey lakes. 



The only macrophyte variable that demonstrated significant 

 correlation coefficients with diatom life-form variables was percent- 

 area coverage, which was positively correlated with the proportion of 

 periphyton, and negatively correlated with the proportion of 

 plankton (Table 4). Percent-area coverage was also negatively 

 correlated with the concentration of planktonic diatoms. Coefficients 

 of determination indicate that the 3 diatom life-form variables 

 correlated with percent-area coverage would each explain only 19- 

 24% of the variance in that variable. Percent loss on ignition and 

 organic matter accumulation rates (Table 5) were not significantly 

 correlated with any of the water chemistry or macrophyte variables. 



Appendix 2 lists the 47 taxonomic groupings that were used in 

 multivariate analyses. Individual taxa were combined into groupings 

 based on taxonomic and ecological affinities, and selected for 

 multivariate analyses based on the results of plots of their 

 percentages versus macrophyte variables. 



