Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie effectsofzebramu00ontauoft Year: 1997 76 78 80 82 84 86 88 90 92 94 Year 76 78 80 82 84 86 88 90 92 94 Year Figure. 23. ARIMA forecasts of total N-to-total P ratios (including 95 confidence intervals) relative to measured monthly means for those seasons for which ••before and after'* zebra mussel invasion data showed statistically significcmt differences. 26

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