Comparison between GAMM with single smooth effect (SSE) vs. GAMM with multiple smooth effect (MSE) on year using catchment for each taxon. * indicates the best model. Scores are fREML scores. EDF: estimated degree of freedom. Diff.: difference between scores of the models. DF: difference between EDF of the models. AIC diff.: difference in the Akaike Information Criterion (AIC) between models. ** indicates the model with the lowest AIC. P = probability of χ 2 test.
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