Table S1 The twenty-five taxonomic groups used throughout community analyses. Digital photographs were analyzed in ImageJ 1.41 (U.S. National Institutes of Health, Bethesda, MD, USA) for percent cover of taxonomic groups using a 100-point overlay grid.

Table S2 Mann-Whitney U tests comparing the density of ascidians on the two anthropogenic habitats surveyed (i.e. dock floats and pilings).

Data S1 Bibliography list of the 108 references used during the literature survey analysis.

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