Table 3.

Parameter estimates for the hygric model

	Estimate	SE	P	ΔAIC
Intercept	−1.216	0.821	>0.05
M	0.795	0.117	<0.01	36.74
V̇CO2	−0.714	0.130	<0.01	25.42
Tm	−0.012	0.006	<0.05	1.60
Ta	0.066	0.029	<0.05	<0.001
P	0.712	0.368	>0.05	<0.001
Ta∗P	−0.035	0.018	>0.05	2.01

Factors are log mass (M, mg), log rate of CO₂ production (V̇CO₂, ml·h⁻¹), measurement temperature (T_m, °C), ambient (habitat) temperature (T_a, °C), log precipitation (P, mm·yr⁻¹), and ambient oxygen (O₂). T_a^∗P is the interaction between ambient temperature and log precipitation, and ΔAIC is the change in model AIC (64) when the parameter is removed from the model.