Fig. 4

Dendrogram of the five habitats surveyed in 1984 and 2002, plus the Mytilus-zone sampled only in 2002, using group-average clustering from Bray–Curtis similarity on non-transformed data. The groups distinguished at the 50% similarity threshold (continuous line) are marked A–C, and the sub-groups distinguished at the 70% similarity threshold (dashed line) are marked 1A–4A, 1C and 2C. (Ent Enteromorpha-, Myt Mytilus edulis-, Fuc Fucus serratus-zone, chan channels, L. dig Laminaria digitata, Lam Laminaria-zone)