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0O CM Algae in Lake algal blooms ammonia Aphanizomenon flos-aquae apron Blue-Green Algae chemical Cladocerans CM 0O CM CM CM CM H CM rH Copepods creek banks creekbed decrease Densities of Planktonic Diatoms in Lake Euglenoids feet and three Figure fish kill foot high gabion silt traps green algae H CM Herman During 1970 i i i i jaquinN Lake Madison long and three Madison and Herman Madison and Lake main section mg/l miles from Lake nitrate o o o CM o o o o o o o o oo CM oo oo oo organisms/ml phosphorus phytoplankton Population Densities r-l r-l r-l rH rH CM ro CM secchi disk series of gabions sewage Southeast Lake Herman species spring run-off sruoqdsoqd summer T/N-eHN three feet three inches wide ua6Axo upstream Variations in Population vertical wall