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We studied the photophysiological responses to ultraviolet radiation (UVR) of\udtwo diatoms, isolated from different environmental niches. Both species\udshowed the highest sensitivity to UV radiation under relatively low\udtemperature, while they were less inhibited under moderately increased\udtemperature. Under the highest temperature applied in this study, the benthic\uddiatom Nitzschia sp. showed minimal sensitivity to UV radiation,\udwhile inhibition of the planktonic species, Skeletonema sp.,\udincreased further compared with that at the growth temperature. These\udphotochemical responses were linked to values for the repair and damage\udprocesses within the cell; higher damage rates and lower repair rates were\udobserved for Skeletonema sp. under suboptimal temperature, while for\udNitzschia sp., repair rates increased and damage rates were stable\udwithin the applied temperature range. Our results suggested that the response\udof the microalgae to UV radiation correlated with their niche environments,\udthe periodic exposure to extreme temperatures promoting the resistance of the\udbenthic species to the combination of high temperature and UV radiation

Differential photosynthetic responses of marine planktonic and benthic diatoms to ultraviolet radiation under various temperature regimes