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ammonification amount anaerobic fermentation anaerobic waters analyses were performed analytical procedure approximately constant basin chemical species chemocline concen conductivity values decrease denitrification determine diffusion dissolved gas analysis dissolved oxygen distribution endpoint gas partitioner gas-stripping chamber gases ground water heat holomictic ice cover increase indicate ions Juday and Birge Lake Adelaide Lake Mary water Lake Rose lake sediments lake's Mary and Rose measured meromictic lake methane method mg/l mixing mixolimnetic waters mixolimnion monimolimnetic waters monimolimnion monimolimnion of Lake nitrogen fixation nitrogen species occurred organic carbon organic compounds organic materials organic-N orthophosphate oxidation percent phosphorus phosphorus species plankton potentiometer present produced saline sample bottles saturation sediments sludge digester specific conductance substrates sulfate sulfide surface waters Table temperature thermal conductivity tion titration total phosphorus total sulfide tration Vilas County water column water layer water mass water samples waters of Lake