Light/Dark Cycle and Temperature‐Their Impact on Phosphate‐Limited Growth ofOscillatoria redekeiV AN G OOR in Semicontinuous Culture

Phosphate‐limited growth ofOscillatoria redekeiin semicontinuous culture has been studied under conditions of continuous illumination at 20 °C as well as in a 12/12 hours light‐dark cycle at temperatures between 5 °C and 20 °C. The subsistence quota (q0) amounted to 0.052 μmol mm−3under all conditions, when the phosphate quota was expressed on the basis of cell volume. The interaction between temperature and phosphate quota and its impact on growth rate are described by the following model: equation image Parameter values aretopt=24.5 °C,tmin=0.95 °C, μmax=0.873 d−1. The maximum phosphate quota was found to depend on temperature and to increase along with declining temperature.