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 2 3 4 5 6 7 8 9 10 11 12 Month 80 -Rosehill 60 â 40 - 20 .PostZM 5-<L Pre-JM 1 1 2 3 4 5 6 7 8 9 10 11 12 Month 70 ^â -Blenheim 60 i J

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