There were
significant differences between months in Phaeophyceae,
calcified Rhodophyta and Chlorophyta (Kruskal-Wallis
test, p<0.01), but this is not the case of non-calcified
Rhodophyta (p>0.05). Of these algal groups, only Phaeophyceae
showed significant seasonal differences
(p<0.01); indeed, this is the only algal group in which
seasonal abundance seems to be determinant in the sea
urchin feeding behavior. The monthly analysis identified
significant differences in the different items: Di, Br and
Ca (one–way ANOVA, p<0.01), Ge and Ch (Kruskal-
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