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 ^ Rosehill (summer) 60 J 40 20 ^ ... tm^ â xl'.\i 76 78 80 82 84 86 88 90 92 94 Year 70 60 1 50 : 40 i 30 : 20 ^ 10 76 78 80 82 84 86 88 90 92 94 Year j Dunn ville (summer)

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