Fig. 4.

Boxplots depicting concentrations of metabolites affected by CO₂ (direct or interactive effects, relative to total creatine (tCr)) in the brain of Gadus morhua at different temperatures and CO₂ partial pressures. White shading indicates control, grey shading high CO₂ partial pressure. Each box contains median, first and third quartile as well as respective standard deviation. Different letters (a, b) indicate significant differences between treatment groups detected by Tukey HSD post hoc analysis (p < 0.05)