Forest plot of estimates (with 95% confidence intervals) of the environmental variables predicting the local CPUE of red swamp crayfish: A) small (R2m = 0.54), B) large crayfish (R2m = 0.57, model-averaging procedure). Values were calculated from the model selection ΔAICc < 2 (provided in Suppl. material 1: table S4). The sign of the relationship between a predictor and crayfish CPUE was ascertained when its 95% confidence interval did not include zero. No estimate was provided for some predictors because they were not in the model selection.