. Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie . 76 78 80 82 84 86 88 90 92 94 Year Figure 22. ARIMA forecasts of fall 8unmonium-to-(nitrate + nitrite) ratios and summer nitrate-N concentrations for the post zebra mussel period at the five Lake Erie sampling 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. 25

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