Sertularia argentea, S. cupressina and Hydrallmania falcata on tide-swept circalittoral cobbles and pebbles
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Circalittoral cobbles and pebbles amongst clean sand or shell gravel in strong tides were covered in hydroids over Balanus crenatus. Sabella pavonina and Lanice conchilega were often common in the coarse sediment around the stones. With increased scouring S. cupressina becomes more common (see ScupHyd) although eventually, as tidal stream strength increases to a point at which the stones are kept mobile, all hydroids are scoured off leaving just Pomatoceros, bryozoan crusts, Balanus crenatus and coralline algae (PomByC).
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