Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie effectsofzebramu00ontauoft Year: 1997 /\' ^ e. E 76 78 80 82 84 86 88 90 92 94 Year 0 - Blenheim (falQ â 1 76 78 80 82 84 86 88 90 92 94 Year ElQin (fall) \;-M]l\ 4' 4 a;. .-/i ./ 76 78 80 82 84 86 88 90 92 94 Year 76 78 80 82 84 86 88 90 92 94 Year ,^ QQ4 ^ Dunnville (fall) O) j ..oa |\ |/.Af. I â â \l \.l-. A 0 1 S^ - z a> ^ H E § - E E < 0- Rosehlll (fair I 76 78 80 82 84 86 88 90 92 94 Year 76 78 80 82 84 86 88 90 92

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Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie effectsofzebramu00ontauoft Year: 1997 /\' ^ e. E 76 78 80 82 84 86 88 90 92 94 Year 0 - Blenheim (falQ â 1 76 78 80 82 84 86 88 90 92 94 Year ElQin (fall) \;-M]l\ 4' 4 a;. .-/i ./ 76 78 80 82 84 86 88 90 92 94 Year 76 78 80 82 84 86 88 90 92 94 Year ,^ QQ4 ^ Dunnville (fall) O) j ..oa |\ |/.Af. I â â \l \.l-. A 0 1 S^ - z a> ^ H E § - E E < 0- Rosehlll (fair I 76 78 80 82 84 86 88 90 92 94 Year 76 78 80 82 84 86 88 90 92 94 Year Figure 20. ARIMA forecasts of summer and fall ammonium-N concentrations for the post zebra mussel period at the five LaXe Erie ScUQpling 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. 23

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