Abstract

The growth response of Anacystis nidulans to sodium and phosphate was studied in batch culture under controlled laboratory conditions. Sodium (range=0–10 mg/l) significantly enhanced growth, most notably, after sodium and phosphate starvation. The magnitude of the increase in growth was dependent on the initial cell density, external concentrations of phosphate, sodium, and potassium, and the nutritional status of the algal inoculum. The increase in ambient sodium levels in many lakes may provide a competitive advantage to some blue-green algae.

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