Fragilariopsis oceanica

Rautenberger, Ralf, 2024, Germanium dioxide as agent to control the biofouling diatom Fragilariopsis oceanica for the cultivation of Ulva fenestrata (Chlorophyta), Botanica Marina (Warsaw, Poland) 67 (2), pp. 93-100 : 95

3.1 Dose-response relationship in Fragilariopsis oceanica

After 22 days of seawater cultivation in 1 l glass beakers, brown biofilms of Fragilariopsis oceanica became clearly visible on the bottom and walls of the beakers of both the control (0 mg l −1) and the lowest GeO 2 concentration ( 0.003 mg l −1) with 27.13 mg DW m −2 and 24.23 mg DW m −2, respectively. In contrast, all GeO 2 concentrations ≥ 0.014 mg l −1 had lower diatom biomass ( 6.56 mg DW m −2) than the control and 0.003 mg GeO 2 l −1 ( P <0.0001, 1-way ANOVA; Figure 2 ).

Figures

Figure 2: Total diatom biomass at different GeO2 concentrations after 22 days of cultivation at 137 µmol photons m−2 s−1 and 9 °C. 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).