Physiological parameters of C. aculeata and D. muscorum samples representing control and experimental groups (dot = mean, box = SE, whisker = 95% confidence interval; n = 8): a membrane lipid peroxidation (TBARS = Thiobarbituric Acid Reactive Substances), b cell membrane integrity (EC = relative electrical conductivity), c dehydrogenase activity (A485 = absorbance of formazan at 485 nm) and d hydrogen peroxide level. The different lowercase letters relate to significant interaction effect and indicate significant differences (p < 0.05). For details see Suppl. material 1: table S1.