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photochemical efficiency of Cylindrotheca closterium f. minutissima that is grown
under at 1000 μatm CO 2 and solar radiation on the initial day of exposure; even when
the organisms had been acclimated for 9 days, the coupling effect of OA and UV still
significantly lowered its electron transport rate, though there was no significant difference in growth (Wu et al. 2012). For Phaeocystis globosa grown at 1000 μuatm CO 2
(with constant pH) and solar radiation, its photochemical efficiency varied with the
intensity of solar radiation (a negative correlation with light intensity), indicating
the lowest values at noon, and there was a coupling effect of UV and OA on its
Fig. 12.3 The carbon fixation rate (a) of coastal phytoplankton of the South China Sea under
different intensities of UVR (without visible light) and the ratio (b) of photosynthetic carbon fixation rates under unfiltered solar radiation or PAR + UV-A to that rate under visible light under
different weather conditions (Gao et al. 2007a, b)
12 Effects of Ocean Acidification and UV Radiation on Marine Photosynthetic…