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The effective quantum yield (ΔF/Fm′) of PS II measured for three limestone (J06, J07, J11) and three sandstone (P05, P08, P09) strains of Klebsormidium at five different pH levels (4–8). The values plotted represent means of four replicated measurements. Differences were evaluated by post hoc comparisons of nonparametric Friedman two-way ANOVA tests (see Figs 8–13). Standard deviations of those measurements are given in Tables S1–S2.
