Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie effectsofzebramu00ontauoft Year: 1997 Aa 76 78 80 82 84 86 88 Year 90 92 94 80 Elgin (summer) i i â ⢠60 - I--â .>'â â 40 - A i- 20 - ,--,.. ,,.;M / 'r^ Prea. 76 78 80 82 84 86 88 90 92 94 Year 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

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