Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie effectsofzebramu00ontauoft Year: 1997 50 40 ^ 30^ E 20 ^ 10 0 -10 1 2 3 4 5 6 7 8 9 10 11 12 Month Elgin PreZM PostZM - . V 5' - z e. - 0 1 1 2 3 4 5 6 7 8 9 10 11 12 Month 1 2 3 4 5 6 7 8 9 10 11 12 Month 0 - Elgin =^^<^=:-^^^'^^. 9~g-g=9-5- PostZM 1 2 3 4 5 6 7 8 9 10 11 12 Month ? I z V c o 1 -1 CO 08 H 0) <s i^ CO s

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