. Effects of zebra mussels on chlorophyll, nitrogen, phosphorus and silica in north shore waters of Lake Erie . 1 2 3 4 5 6 7 8 9 10 11 12 Month Figure. 6. Monthly means + 1 St. Dev. of chlorophyll and nutrient concentrations during pre- (1984-87) and post (1990-94) zebra mussel time periods in samples from the Elgin water intake.

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