. The ecology of algae : a symposium held at the Pymatuning Laboratory of Field Biology on June 18 and 19, 1959 . BOD OF SOLUBLE MATTER EXCESS PRODUCED IN CONTINUOUS LIGHT 1. SAMPLE AS RECEIVED; INCUBATED IN DARK 2. SAMPLE CENTRIFUGED; INCUBATED IN DARK 3. SAMPLE AS RECEIVED; INCUBATED IN LIGHT 6 TIME 8 DAYS lU EFFECT OF NATURALLY OCCURRING PHYTOPLANKTON ON RATE OF OXIDATION IN A FOX RIVER SAMPLE STATION C. JULY 25. 195G Fiqure 6 Modified from Wisniewski, 1958 volume, or some other expression. Toward this end the Sanitary Engineering Center is continuing to study photosynthetic oxygen pro
. The ecology of algae : a symposium held at the Pymatuning Laboratory of Field Biology on June 18 and 19, 1959 . BOD OF SOLUBLE MATTER EXCESS PRODUCED IN CONTINUOUS LIGHT 1. SAMPLE AS RECEIVED; INCUBATED IN DARK 2. SAMPLE CENTRIFUGED; INCUBATED IN DARK 3. SAMPLE AS RECEIVED; INCUBATED IN LIGHT 6 TIME 8 DAYS lU EFFECT OF NATURALLY OCCURRING PHYTOPLANKTON ON RATE OF OXIDATION IN A FOX RIVER SAMPLE STATION C. JULY 25. 195G Fiqure 6 Modified from Wisniewski, 1958 volume, or some other expression. Toward this end the Sanitary Engineering Center is continuing to study photosynthetic oxygen production in rivers and sewage stabilization ponds and also is co- operating with the Tennessee Valley Authority on similar studies on rivers immediately below large impoundments . Costs of Dissolved Oxygen from Algal Photosynthesis Oxygen production by algae is not a free ben- efit to the aquatic habitat. At times, in fact, it is probable that the benefits do not outweigh the costs . Stimulation of algal production by nutrients derived from sewage, other organic wastes, and their decomposition products can lead to formation of a mass of organic matter greater than that of the original waste (Renn, 1954) . This result is demon- strable in the laboratory. It was also observed by Renn at two study stations on the Potomac River that, during the bright light period, rise and fall of concentrations were parallel with rise and fall of dissolved oxygen. This observation was interpreted to indicate accelerated production of algae that became a part of the total 62
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