A method based on the geometric shape of the cells was used for
the biomass calculation (Kiselev, 1969; Moncheva and Parr, 2010).
Biomass was expressed in units of wet weight (mg/m3) and carbon
units (mg C/m3). Recalculation of raw biomass into carbon units was
performed using a formula that takes into account the systematic identity
of algae (Menden-Deuer and Lessard, 2000). Dominant species
were determined as reported previously (Kiselev, 1969; Moncheva
and Parr, 2010).