Resource competition of Cyanobacteria, Chlorococcalesa and diatoms for ammonium ions under steady and non-steady state

Cyanobacteria, Chlorococcalesa, and diatoms were investigated on competing characteristics under limited ammonium in steady and non steady state. Results showed that M. aeruginosa, S. quadricauda, and N. palea coexisted at all series of ammonium concentration in steady state. M. aeruginosa and S. quadricauda coexisted at per day, per-2-day, and per-4-day supply modes. M. aeruginosa dominated at per-8-day mode where S. quadricauda and N. palea were washed out. Monod model can predict the competing results only at quite low N concentration, while Droop model can exactly explain the results at most of N concentrations in laboratory.