Fig. 4

Predicted effect of the position of the sun with respect to the horizon on the depth use of each acoustically tagged post-smolt (presented as individual lines) for each combination of fjord zone (A-D, see Fig. 1) and river. The thick black line shows the mean predicted effect of sun position on depth use across individuals within each facet. Modeling did not indicate that there were significant differences between rivers; the panels shown here are only meant to aid in visualization. Predictions were made from the selected depth-use model presented in Table 2 and include both the fixed effect of sun position, the fixed effects of fjord zone, and the random intercept and slope effects with respect to sun position per individual