Figure 5: GeO2-dependent total diatom density present on the surfaces of Plexiglass water tanks after 14 days of large-scale cultivation of Ulva fenestrata. Data are means of three replicates per treatment (n = 3) and error bars represent standard deviations. Lowercase letters above columns indicate statistically significant differences between the treatments (P <0.001, 1-way ANOVA, Tukey-Kramer HSD post-hoc test).