Generalized nonlinear models relating measured E. propertius CO2 production rate to measured body temperature.

All models provided a better fit than a linear model (CO2 = S×T; log-likelihood test, p2: CO2 production rate, ml·min−1; T: Temperature, °C; M: body mass, mg. Coefficients estimated by maximum likelihood: S: an overall scaling factor; Ms: a mass scaling factor; Ts: a temperature scaling factor (i.e. thermal sensitivity). Lmet: theoretical minimum life-supporting metabolic rate. AIC: Akaike's Information Criterion; df: degrees of freedom.