. Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie . 0 76 78 80 82 84 86 88 90 92 94 Year : Rosehill (summer) *<Wi 1 ' \ . Pred. ' 76 78 80 82 84 86 88 90 92 94 Year 76 78 80 82 84 86 88 90 92 94 Year Figure 21. ARIMA forecasts of spring and summer ammonium-to- (nitrate + nitrite) ratios for the post zebra mussel period at the five Lake Erie seunpling locations. Measured data points lying outside the +95% confidence envelope of a forecast imply a significant deviation from those expected on the basis of the pre-zebra
. Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie . 0 76 78 80 82 84 86 88 90 92 94 Year : Rosehill (summer) *<Wi 1 ' \ . Pred. ' 76 78 80 82 84 86 88 90 92 94 Year 76 78 80 82 84 86 88 90 92 94 Year Figure 21. ARIMA forecasts of spring and summer ammonium-to- (nitrate + nitrite) ratios for the post zebra mussel period at the five Lake Erie seunpling locations. Measured data points lying outside the +95% confidence envelope of a forecast imply a significant deviation from those expected on the basis of the pre-zebra mussel data. 24
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