Metabolic and thermal tolerance trait variation among individual Fundulus heteroclitus. Relative physiological trait performance at 12 °C (blue) and 28 °C (red) acclimation and assay temperatures for A)Whole animal metabolic rate versus thermal plasticity between acclimation temperatures, B critical thermal maximum versus thermal plasticity between acclimation temperatures, and C-F cardiac metabolism under 12 °C and 28 °C acclimation and assay temperatures with substrates C glucose, D fatty acids, E lactate ketones and ethanol (LKA), and F endogenous (no substrate). Previously, difference between individuals when acclimated and assayed at 12 °C (blue) and 28 °C (red) revealing up to 14-fold variance in mass corrected whole animal metabolism (for the most plastic individual), 0.25-fold variance in critical thermal maximum, and 13-fold variance in fatty acid cardiac metabolism (the most variable substrate). Adapted from Drown et. al. 2021.