. 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 Appendix Figure 2. Monthly mean chlorophyll a concentrations during siommer (June, July and August) and fall (September, October and November) with ARIMA forecasts 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. 36

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