CHAPTERS 

 RESULTS 



Thirty lakes were sampled in the surface-sediment survey 

 (Table 1). Lake Miona was removed from the data set prior to 

 statistical analyses because the lake was observed to contain 

 virtually no macrophytes despite a percent-volume infestation value 

 of 86% measured by Canfield (unpub. data). Triploid grass carp had 

 been introduced to Lake Miona by the Florida Game and Freshwater 

 Fish Commission in the time between the macrophyte and surface- 

 sediment surveys in order to control aquatic vegetation (M. Hoyer, 

 pers. comm.). 



Many correlation coefficients were used in this study to assess 

 relationships between morphometric, water-chemistry and 

 macrophyte variables and to determine which environmental 

 variables influenced specific groups of diatoms. The criterion for 

 significance of all correlation coefficients discussed below is the a = 

 0.05 level of significance. 



Water-chemistry values (Table 2a) showed that survey lakes 

 ranged from ultraoligotrophic to hypereutrophic (TSI(AVG): 4.1 to 

 88.5) as determined by water-column nutrient concentrations, and 

 from acidic to alkaline conditions (pH: 4.61 to 9.03). Total N/total P 

 ratios suggested that Lakes Wauberg and Alligator were N-limited 

 (Ruber et al. 1982). Log-transformed water-column total P was 



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