Abstract
Measurements of biochemical composition and photosynthetic carbon metabolism were used to determine the physiological state of a metalimnetic population of Oscillatoria rubescens in Crooked Lake, Indiana, during 1979 and 1980. The percentage of photosynthetically fixed CO2 incorporated into protein did not vary diurnally, but the variation observed over 3‐day periods was as large as that found seasonally, which suggested that changes in environmental conditions occurred during these intervals. Several of the biochemical measurements did not change during the year, including the ratios of chlorophyll a or phycoerythrin to protein and protein to dry weight; the ratios of carbohydrate or RNA to protein were more promising indicators of long term changes in the physiological state of the population because there were seasonal changes in these. Alkaline phosphatase activities were measured in the epilimnion and metalimnion as an index of phosphate limitation. In the epilimnion levels were similar to those found in phosphate‐limited algal cultures, whereas in the Oscillatoria layer the activities were sevenfold lower.
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