Fig. 4

Classification (a) and ordination diagrams (b) based on the presence/absence of Syllids. The clusters (A1, A2, B) are overlaid on the ordination diagram, which also represent the substrate type for each sample. Spearman’s correlation vectors of environmental data are provided as supplementary variables. The species with the highest Spearman’s correlation (ρ > 0.4) are represented as vectors in a separate ordination