Figure 2.

Contents of Chl a (a), Chl b (b) and carotenoids (c) after C. pyrenoidosa cells were exposed to various concentrations of Hg²⁺ for 24 h. Data are means ± S.E. (n = 3). Significant differences between different treatments were shown as different letters (p < 0.05, ANOVA, Duncan’s test).