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acid algae algal alkalinity amount analyses Apparatus and Supplies aquatic bacteria bacterial basin benthic biomass bottles calculated cell chamber chemical chemostat chlorophyll coefficient collection color compounds concentrations counting curve Daphnia decomposition density depth determined dilute dissolved organic dissolved oxygen distilled water drainage drainage basin dry weight Ecology ecosystems electrode epilimnion estimate evaluation Exercise factor filter filtration Fish flask fresh waters G.E. Likens glass heat hypolimnetic hypolimnion incubation inorganic interval invertebrates laboratory light Limnol Limnology littoral zone macrophytes measured membrane metabolism meter method Mirror Lake nitrogen nutrient obtained Oceanogr OPTION organic carbon organic matter particulate phenolphthalein phosphorus photosynthesis phytoplankton pigment pipet plankton plot population predators primary productivity procedures quantitative radioassay rates reagent sampler sediments solution species spectrophotometer standard stopper stream substrate surface Table techniques temperature thermocline titration tube uptake values versus vertical volume water samples Wetzel zooplankton