EC descriptive (hurdle) model.

The first two columns list each environmental variable and the associated lag with the strongest Spearman correlation to log10-transformed EC concentration. daytime and hours_from_noon were excluded from the temporal lag process. chl and turb values were log10-transformed and all variables were normalized (i.e. made unitless) prior to model fitting. The Binary Model column shows the non-zero permutation feature importances (i.e. the change in model accuracy upon fitting a model after randomly shuffling the variable’s data five times) of the random forest model. The Concentration Model columns show the variable coefficients and associated p-values of the generalized least squares regression model; values where p-value is less than 0.05 are bolded and variables with no value were removed from the model due to high variance inflation factor (VIF).