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0ept 0owa abundant amount of plankton August bottom Brachionus Burlington cent centimeters per cubic Chippewa River Cladocera CM CM CM cm.3 per cubic cochlearis content of plankton Copepoda and Cladocera Croix cross section crustaceans cubic centimeters cubic meter Daphnia Daphnia retrocurva depth detritus diatoms Difflugia distribution of plankton Fairport feet per second fishes forms Gauge read increase of plankton Iowa July JuOy Keokuk Dam Lake Keokuk Lake Pepin Leptodora lower main channel mean number Melosira crenulata meter of water miles Minn Mississippi River Nauvoo number of Copepoda numbers of stations observations pala plankton content plankton of Lake ponds Prairie du Chien productive capacity pump quantity Reads Landing Red Wing rH rH river plankton Rock Island Rapids Root River Rotifera Sept September shallow sloughs stream Sturgeon Bay tributaries upper Mississippi vertical distribution volume of plankton Wisconsin River zooplankton Zumbro River