Fig. 3From: Environmental factors structuring polychaete communities in shallow rocky habitats: role of physical stress versus habitat complexityPolychaete density, species richness, and diversity (H′) per quadrat for the different depth levels. Bars represent means + SD values. Uppercase letters (A–E) refer to mean 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 ranksBack to article page