Coralline crusts and crustaceans on mobile boulders or cobbles in surge gullies
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Highly mobile and scoured boulders and cobbles found on cave and gully floors often appear bare. Where there is sufficient light, however, the boulders are encrusted by coralline algal crusts. Decapods such as Pagurus spp., Cancer pagurus and Carcinus maenas also occur, often beneath and between the rocks. The slightly less-scoured walls often found above this biotope in caves and gullies are generally characterised by a similar, but richer community of scour-tolerant Balanus crenatus, Pomatoceros triqueter, coralline crusts and spirorbid worms (EIR.CC.BalPom). This impoverished biotope may form an intermediate between barren gravel and slightly more stable larger pebbles and cobbles which are covered by algae that are often found in the mouths of caves (EIR.FoSwCC).
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