Pomatoceros triqueter, Balanus crenatus and bryozoan crusts on mobile circalittoral cobbles and pebbles
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Cobbles and pebbles with Balanus crenatus, Pomatoceros and a few bryozoan and coralline algal crusts are often found at the base of exposed cliff faces where scour action prevents colonisation by more delicate species. Occasionally in tide-swept conditions tufts of hydroids such as Sertularia argentea and Hydrallmania falcata are present. This biotope often grades into Flu.SerHyd which is characterised by large amounts of the above hydroids on stones also covered in Pomatoceros and barnacles. The main difference here is that Flu.SerHyd seems to develop on more stable, consolidated cobbles and pebbles in moderate tides - these stones may be disturbed in the winter and therefore long-lived species are not found.
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