Density of invertebrates found living inside mussel matrix at the main experimental sites.

<p>Densities of amphipods, snails and limpets all consisted of aggregates of 2 species (i.e., <i>a</i> and <i>b</i>); scientific names of taxa not found in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0024502#pone-0024502-g002" target="_blank">Fig. 2</a> are <i>Oulactis muscosa</i>, <i>Aulactinia sp.</i> and <i>Phymactis sp.</i> (anemone), <i>Mytilus edulis</i> (mussel) Nemertea (ribbon worm), Nudibranchia (nudibranchs), Ophiuiridea (brittle star), <i>Balanus glandula</i> and <i>B. laevis</i> (barnacle). All other x-axis labels correspond directly to species names listed in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0024502#pone-0024502-g002" target="_blank">Fig. 2</a> legend. Bars are +/−1 SE.