Fig. 5

Conditional effects on Chinook salmon bathymetric depth ratio (zero at surface and one at sea floor) of: bottom depth a, bottom slope b, day of detection c, maturity stage/fork length/lipid content d, day/night e, and easting-northing f. Conditional effects represent median random forest regression model predictions (lines or point), assuming all other variables are fixed to reference values (i.e., medians for continuous covariates and 0.5 for dummy variables). Predictions based on maturity stage assume stage-specific mean values for fork length and lipid content. Predictions based on location exclude the effect of spatially correlated variables (i.e., mean bottom depth, mean bottom slope, distance to shore, dynamic oceanographic features). Ribbons and whiskers represent 95% jackknife confidence intervals