The syllids inhabiting 12 hard bottom macrobenthic habitats were studied. A total of 38 species belonging to 19 genera were identified. Differences in density, species richness, and diversity among, habitats were analysed, its well its the relationships between these ecological parameters and depth range, slope and in-bay/out-bay gradient. The effect of environmental variables on syllid distribution wits studied using, canonical ordination. A high faunistic homogeneity has been found, since all biotopes were dominated by a low number of eurytopic species (Syllis armillaris. S. gracilis and S. variegata). Habitat complexity, determined by physical disturbance, is the main structuring factor in syllid populations. Biotopes with the hi-hest structural complexity displayed it high number of companion species increasing ecological indices and denoting a well-structured habitat. On the other hand, communities such as in upper intertidal habitats, mainly controlled by physical environmental variables, showed it poorer syllid fauna, dominated by ubiquitious species and a few stenotopic species well-adapted to those environments. However, this is not the case in some other intertidal biotopes, such as in Corallina, whose tangled structure prevents drying and provides shelter from predation, allowing a richer and more diverse syllid fauna.
Serrano, A., San Martín, G., & López, E. (2006). Ecology of Syllidae (Annelida: Polychaeta) from shallow rocky environments in the Cantabrian Sea (South Bay of Biscay). Scientia Marina, 70(S3), 225–235. https://doi.org/10.3989/scimar.2006.70s3225