SUMMARY: Chlamydomonas reinhardii populations in nitrite-limited chemostat culture exhibited damped oscillations in cell number following sharp changes in dilution rate. These oscillations had a period of about 70 h and damped out after not more than two clearly observable cycles. Residual nitrogen in the culture medium during these cycles remained very low (less than 1 μmol N 1−1). The oscillations were apparently caused by the presence of a complex delay of two distinct physiological components in the relationship between cell division rate and environmental limiting nutrient concentration.
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