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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).