Fig. 2. Substrate-specific metabolic rates. Displayed are the residuals from log-regression of metabolism versus body mass. The identification number of each individual is shown on the x-axes (M, Maine population; G, Georgia population). (A) Substrate-specific metabolism. (B) Metabolism for all three substrates. Negative values indicate metabolic rate below the value predicted by log Body mass regression. The numbers at the top of the graph are group numbers (see text). FA, fatty acid; LKA, lactate, ketones and alcohol. Data from Oleksiak et al. (Oleksiak et al., 2005).