Fig. 5

Polychaete density, species richness, and diversity (H′) per quadrat for the different habitats. Uppercase letters refer to median values arranged in descending order. Groups of underlined letters indicate non-significant differences between pairs of means according to “a posteriori” Dunn’s tests following a significant Kruskal–Wallis ANOVA on ranks. Asterisks indicate under-sampled habitats that were not considered in the statistical analyses. For abbreviations, see Methods