Proportion (+SE) of large (40–60 mm t.d.) green sea urchins (<i>Strongylocentrotus droebachiensis</i>) feeding on kelp (<i>Alaria esculenta</i>), underneath the kelp canopy, on the tiles outside of the area swept by kelp, and on the tank walls, at the end of trials at null, low, intermediate, and high wave velocity (0.0, 0.1, 0.2, and 0.3 m s^-1, respectively) in two seasons (Spring and Summer) (Experiment 2).

<p>Wave treatments not bracketed by the same horizontal line are different (data pooled across seasons, LS means, <i>p</i><0.05, n = 15 for each velocity). Panels with an asterisk indicate a significant difference in proportions between seasons (Summer>Spring for urchins underneath the kelp canopy and Spring>Summer for urchins on non-swept tiles) (data pooled across wave velocities, LS means, <i>p</i><0.05, n = 32 and n = 28 for Spring and Summer, respectively).