Figure 2. Productivity, growth rates, FW:DW ratios and ash contents of macroalgae cultures.

Mean (±S.E.) ash-free dry weight productivity (g m⁻² day⁻¹) (A), specific growth rate (SGR, % day) (B), FW:DW ratio (C) and ash content (D) of three macroalgae grown under three aeration levels. CL: Cladophora; SP: Spirogyra; OE: Oedogonium. Data are pooled across CO₂ treatments. Standard errors are calculated as the variation in means between the three weeks of the experiment (n  = 3).