Comparison of linear regression models describing the relationship between RBC δ13C and δ15N and geographic location of summer non-breeding foraging areas for the 14 loggerheads fitted with satellite tags.

Model selection used Akaike’s Information Criterion, corrected for small sample sizes (AICc). Abbreviations are as follow: RSS = residual sum of squares, N = number of observations, K = number of parameters, ΔAICc = difference between each model and the best model, AICc weight = relative information content, P = probability associated with the best model, lat = average latitude of foraging ground based on tracking data, dist shore = distance from shore (in km) calculated from the point having as coordinates average latitude and longitude of foraging ground, lat * dist shore = lat + dist shore + lat * dist shore.