Table 2. Growth physiology parameters in cultures of UWO 241 and SAG 49.72 grown under control versus long-term stress conditions. Values are means with standard deviations (n=3 biological replicates). Superscript letters - a, statistical significance between control vs. stress within one algal species;b, statistical significance between UWO 241 vs. SAG 49.72 when grown under same treatment (p<0.05). FV/FM, maximum photochemical efficiency; qL, photochemical quenching, measured at growth irradiance (see Table 1).