Photosynthetic efficiency of D. salina cultured in seawater (complete
nutrient deprivation) showed the greatest reduction over the
12-day cultivation (Fv/Fm, a, rETR and Ik were reduced by 17%, 5%,
32% and 36%, respectively) (Fig. 3). These results indicate that complete
nutrition deprivation results in the greatest physiological
stress for D. salina, while the nitrogen deprivation was the greatest
nutrient stress for C. muelleri (Fig. 2). Previous studies have also
shown that the nitrogen deprivation had the greatest effect on
photosynthetic parameters for Chlorella sp. (White et al., 2011).