Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie effectsofzebramu00ontauoft Year: 1997 1 2 3 4 5 6 7 8 9 10 11 12 Month 1 - a> S. - E I o I - < Elgin PreZM / i_i-5-D-S Post ZM^^ ^~- 1 2 3 4 5 6 7 8 9 10 11 12 Month \; 5âtâ° S Z ^ ^ z â I 5 \Y^ 'fnxh^ ^ / PreZM 1 2 3 4 5 6 7 8 9 10 11 12 Month Elgin PostZM

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