Salt and species-dependent concentration thresholds (in mM, except for the BG11 medium) above which irreversible blooms form.

Reference concentration of 1 is that of BG11 specified in Material and Methods. The reported concentrations of BG11 are the final relative values while the concentrations of all other salt are the amount added to the samples and are expressed in mM. For comparison, the BG11 at 1X contains 17.65 mM NaNO3, ∼ 18 mM Na+, ∼ 0.2 mM K+, ∼ 0.25 mM Ca2+ and ∼ 0.3 mM Mg2+Salt and species-dependent concentration thresholds (in mM, except for the BG11 medium) above which irreversible blooms form.