Figure 3. Effect of quinine sulfate (QS) on a co-culture of C. kessleri and B. calyciflorus. (A) Effect of
quinine sulfate on B. calyciflorus. (Circles stand for the rotifer mortality at different quinine sulfate
concentrations); (B) Effect of quinine sulfate on C. kessleri. (Circles stand for the algae growth rates at
different quinine sulfate concentrations).
The persistence of QS over 10 days was confirmed by re-inoculating the 26 M QS experiment
with newly hatched rotifers. 100% rotifer mortality was observed after 24 h which shows that QS
remains toxic to rotifers for at least 10 days in solution.