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Chlorophyll-a <br />•Measure of chlorophyll <br />producing pigments in algae- <br />indirect measurement of algae <br />or phytoplankton <br />•Response variable to Total <br />Phosphorous <br />•State Standard for shallow <br />lakes in the North Central <br />Hardwood Forest Ecoregion is <br />20µg/l <br />Chlorphyll-a <br />in Silver Lake <br />2011-2018 <br />0.00 <br />10.00 <br />20.00 <br />30.00 <br />40.00 <br />50.00 <br />60.00 <br />2011 2012 2013 2014 2015 2016 2017 2018Chl-a (ug/l)Chl-a (ug/l)Chl-a State Standard <br />38