Details of field-based experimental design and setup, and tables with statistical results.

Exclusion/enclosure method and effectiveness: Preliminary experiments, experimental design and procedures (Figure A). Repeated measures ANOVA of a) bare rock and b) ephemeral algae (i.e. Ulva compressa, U. rigida, Pyropia sp.) found inside the experimental plots of the field experiment (Table A). Split-plot analysis of variance of D. antarctica plantlets fronds length a), and wet weight b) transplanted into acrylic plates in different grazer treatments in the field experiment 2 (Table B). (PDF)