Comparison of functions used to describe the thermal performance curves of the three populations of the land snail <i>Cornu aspersum</i> across the latitudinal gradient, using Akaike’s information criterion (AIC).

The function with the lowest AIC is the one that best describes the data. K = number of parameters in the function, λi = difference between a given model’s AIC and the lowest AIC, wi = Akaike weight. Models in boldface were selected for analyses.