Effects of growth parameters on induction of sexual reproduction in <i>T</i>. <i>pseudonana</i> CCMP1335, <i>T</i>. <i>weissflogii</i> and <i>C</i>. <i>cryptica</i>.

Oogonia and auxospores always appeared in stationary phase. The percentage of the total population (at least 300 cells counted per replicate) differentiated into oogonia or auxospores when grown in nitrate or ammonium is shown for the day they were at their maximum number; data are mean values ± s.d., biological replicates n = 3.