In three bar plots (Figs 4, 5 and 7), the species labels for Calliarthron tuberculosum and Corallina officinalis were swapped. Calliarthron tuberculosum should be the second presented species in all three figures, and Corallina officinalis should be the third. The correct figures are shown below, and both the online full-text and PDF versions of the article have been updated.

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