Fig. 4

Projection of the studied variables and observations onto the factorial plane PC 1 and PC 2 for Dinophyta and Haptophyta. Indicators (variables): light intensity (µmol photons m^− 2 s^− 1); cultivation time (days); lipid content (% DW); lipid productivity (mg L^− 1 day^− 1); total nitrogen (g L^− 1); total phosphorus (g L^− 1); N:P (unit). Observations: species or strain numbers (circles): Akashiwo sanguinea (1); Alexandrium affine (2); Polykrikos geminatum (3); Prorocentrum minimum strain a (4); Prorocentrum minimum strain b (5); Prorocentrum triestinum strain a (6); Prorocentrum triestinum strain b (7); Scrippsiella rotunda (8); Isochrysis aff. galbana clone T-Iso CCAP 927/14 (9); Isochrysis galbana (10); Isochrysis sp. (11–13); Isochrysis sp. (T-ISO) CS 177 (14); Isochrysis sp. F&M-M37 (15); Diacronema lutheri CS 182 (16); Rebecca salina CS 49 (17); Pavlova sp. (18, 19)