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P. ambiguum and M. aeruginosa were exposed to varying lights peaking at 300 or 600 PAR (in 6hours) and reached to 0 in 6h. H2O2 and antioxidants of two species were proportionate and neither species were stressed. M. aeruginosa was exposed to ~900 PAR found that M. aeruginosa stress recovery ability was improved with increasing stress duration. Findings revealed that the continuous suppression of with high light exposure alone is difficult and should be combined with other factors. The macrophyte allelopathy and flow velocities combined with the light stress were tested. The Egeria densa and Myriophyllum spicatum successfully suppressed the M. aeruginosa. M. aeruginosa allelopathy also affecting negatively on E. densa. low flow velocity can help M. aeruginosa to escape from light stress.
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