Experiment 1. Test diameter of Loxechinus albus juveniles fed with different natural
foods for 90 days. The values represent the mean of 9 replicates (standard error bars
have beenomitted to simplify the figure). The vertical bars at the right of the graph overlap
treatments that did not differ significantly (P N 0.05, Tukey's test) at the end of the 90-day
experiment.