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algae Alkalinity Ammonia annual mean blue greens Carbon dioxide Cedar River changes in Lake chemical conditions CM CM CM CM St colorimeter Comita and Anderson Corvallis Environmental Research Daphnia Development diversion of sewage Edmondson l972a Environmental Protection Agency Environmental Research Laboratory epilimnion eutrophication Figure Health Association l960 hypolimnion i—i rH inflow input Klett Lake Washington limit of detection Limnol Limnology maximum Mean values method mg/l nitrate nutrient income Oceanog Oxygen panuT^uoo perchloric acid period of study phorus Phosphate-phosphorus Phosphorus Loading phytoplankton plankton post-recovery period PROPERTIES OF LAKE radiation recovery of Lake rH i—i rH r-l rH rH CM rH rH rH Scheffer and Robinson Seattle Secchi disc transparency Seston stratification Strickland and Parsons summer surface water total phosphorus content trophic equilibrium U.S. Environmental Protection U.S. Geological Survey U.S. Weather Bureau ug/l University of Washington variations varied Vollenweider W. T. Edmondson watershed winter yg/l zooplankton