Abstract:
The photopigment content of 3 clones of the Florida (USA) red tide marine dinoflagellate Karenia brevis (Davis) G. Hansen
and Moestrup (Daugbjerg et al., 2000), isolated from natural bloom events in 1953, 1996, and 2001, were analyzed after
acclimating cultures to high and low irradiance treatments. Photosynthetic pigment and carotenoid concentrations in each
clone decreased with increasing irradiance. Multiple carotenoid/chlorophyll (chI) ratios differed within and between
clones and irradiance treatments. However, the gyroxanthin-diester/chl a ratios were not significantly different within each
clone exposed to high and low light.
