The ecology of algae The ecology of algae : a symposium held at the Pymatuning Laboratory of Field Biology on June 18 and 19, 1959 ecologyofalgaesy00tryo Year: 1960 n — e Cl d 3 — 2 — OHIO RIVER WATER-DARK OHIO RIVER WATER-DAYLIGHT 2 U 6 8 10 12 t, DAYS INFLUENCE OF ILLUMINATION ON OF SAMPLE CONTAINING ALGAE AUGUST 26, 1955 Figure 10 m period may give an unduly high value because of algal respiration, death, and decay; (b) incubation with illumination as an attempt at improvement may give unduly low or negative (Figure 6) be- cause of the addition of oxygen by photosynthesis;
The ecology of algae The ecology of algae : a symposium held at the Pymatuning Laboratory of Field Biology on June 18 and 19, 1959 ecologyofalgaesy00tryo Year: 1960 n — e Cl d 3 — 2 — OHIO RIVER WATER-DARK OHIO RIVER WATER-DAYLIGHT 2 U 6 8 10 12 t, DAYS INFLUENCE OF ILLUMINATION ON OF SAMPLE CONTAINING ALGAE AUGUST 26, 1955 Figure 10 m period may give an unduly high value because of algal respiration, death, and decay; (b) incubation with illumination as an attempt at improvement may give unduly low or negative (Figure 6) be- cause of the addition of oxygen by photosynthesis; and (c) incubation with intermittent illumination, although superficially attractive, does not suffi- ciently simulate stream conditions in terms of tem- perature, illumination, availability of nutrients , and other factors. A number of attempts have been made to mod- ify the procedure to make the result more meaningful with samples containing algae . Abbott (1948) incubated duplicate samples in bot- tles for 48 hours, one bottle of the pair in darkness and the other exposed to light at a north window. Test results were expressed as a ratio, L ~ D Oo- Od when Oq is initial dissolved oxygen, Ol and Od are concentrations after light and dark incubation respectively. Later, the procedure was modified further (Abbott, 1952) to measure the light energy during incubation with a hydrogen iodide actino- meter. In studying the influence of blue-green algae on the result, Wisniewski (1958) modified the test to determine separately the influence of living, dead, and variable concentrations of algae. Further studies on this problem are in progress at theUniversity of Wisconsin,the Sanitary Engineering 66
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