From the beginning of May, an increase of green algae was recorded (with higher Chl-a concentrations).
On 24 May, cyanobacteria started to develop and from 4 June, their concentrations (10 mg L1) were higher than those of green algae leading to a visible bloom of Aphanizomenon flos-aquae. This sharp view of algal succession clearly evidenced that the growth rate of each algal species took place at the timescale of the day. For instance, diatoms and cyanobacteria species were only significantly detected over approximately 12 weeks in May and June 2010 and their amounts were multiplied by 1020 within 23 days.