Abstract
The effects of solar and artificial ultraviolet radiation on pigment composition and photosynthetic oxygen production were studied in three strains of the dinoflagellate Prorocentrum. Extended exposure to UV radiation caused bleaching of the photosynthetic pigments; the carotenoids were less resistant than chlorophyll c 2 but more than chlorophyll a. In addition, there was a bathochromic shift in the chlorophyll a absorption after extended UV irradiation. Photosynthesis was impaired by solar radiation in all three strains, however Prorocentrum micans isolated from the Atlantic off Portugal was much more resistant than the Prorocentrum strains isolated from Kattegat or from the Baltic Sea. In contrast, respiration was hardly affected by exposure to solar radiation and even increased in two of the strains.
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