Fig. 4

Non-metric multi-dimensional scaling ordination of the sampled hydroid assemblages at Chafarinas Islands in 1991 (triangle) and 2007 (square). 0 = 0/−5 m; 5 = −5/−10 m; 10 = −10/−15 m and 15 = −15/−20 m (stress = 0.11)