Fig. 2

Epilithic biofilm abundance at both the lower (white squares) and upper (gray squares) high intertidal zones in the different experimental plots (C controls, EC experimental controls, E exclusions). Different letters indicates differences among heights and treatments (two-way ANOVA on log transformed data; Tuckey HSD test; P < 0.001 in all of the cases). Rectangles represent 25th and 75th percentiles, bars are 1st and 99th percentiles, and squares within rectangles are the median