Summary of model selection.

Given are the predictor and the response variables with VIP>1 in PLS included in each model, the model equations (Model), the direction of the relationship (Direction), number of parameters included in each model (k), degrees of freedom (df), second-order Akaike’s information criterion (AICc) as an estimation of model fit, the adjusted R2 and the p-value. cf = condition factor, copep = contribution of copepods to diet, clad = contribution of cladocerans to diet, roach.lit = littoral CPUE of roach, pisc.lit = littoral CPUE of piscivores.