. Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie . I I I I I I I I I -100 -50 TP/FRP TKN Ammonium Nitrate' Nitrite Org N/lnorg N ^ NH'*/(NCh+N02) Orgarilc N Inorgaruc N N/P I I I I 50 100 150 200 Figure 14. Percentage change in selected nutrient variables axxd ratios pre- (1984-87) and post (1990-93) zebra mussels at the Rosehill intake s«unpling location. Those marked with an asterisk are statistically significant (Mann-Whitney D-test; P<). 16

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