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The article discusses a study regarding non-photochemical chlorophyll fluorescence quenching (NPQ) and xanthophyll cycle responses resulting from photosynthetically active radiation (PAR) and ultraviolet radiation (UVR) in certain coastal phytoplanktons from Potter Cove on King George Island in Antarctica. The study involving Chaetoceros brevis and Phaeocystis antarctica cultures aims to determine whether photoinhibition plays a role in taxon dominance and moderate phytoplankton biomass in the region during summer. Results show that high light acclimation has led to significant NPQs and a decrease in excess PAR and UVR effects on photosynthesis. Another finding indicates that P. antarctica was more dependent on chloroplast protein synthesis under protein synthesis inhibition.