Abstract
Dependence of specific growth rate of the planktic blue-green alga Anabaena solitaria on light intensity (continuous light) was described using modified Mitscherlich-equation. Deficiency of combined nitrogen does not remarkably influence either maximum specific growth rate or parameters of light utilization efficiency (i 0, k I). Growth rates at any light intensities are lower by only 10% if only elemental N 2 is available. Whereas nitrogenase activity is suppressed by ammonium nitrate supply to a very low level, heterocysts are still present under the same conditions. The results are discussed with respect to the adaptability of A. solitaria to changing but limiting nitrogen supply.
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