Figure 4.

Cell counts (A–C), cell diameter (D–F) and total biovolume (G–I) of Microcystis PCC 7806 at 24 h after addition of different H₂O₂ concentrations. Microcystis PCC 7806 was exposed to H₂O₂ at three different light intensities: (A,D,G) 0 µmol photons·m⁻²·s⁻¹, (B,E,H) 15 µmol photons·m⁻²·s⁻¹ and (C,F,I) 100 µmol photons·m⁻²·s⁻¹. The bars represent the average of two independent biological replicates per treatment at 24 h after H₂O₂ addition. For comparison, horizontal, dashed lines indicate the cell counts (A–C), cell diameter (D–F) and total biovolume (G–I) prior to H₂O₂ addition (t = 0 h).