Balanus crenatus and/or Pomatoceros triqueter with spirorbid worms and coralline crusts on severely scoured vertical infralittoral rock
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Severely scoured bedrock in wave-surged caves, tunnels or gullies often look bare, but are characterised by a limited scour-tolerant fauna of Balanus crenatus and / or Pomatoceros triqueter with spirorbid polychaetes. In areas where sufficient light is available, the rock surface is covered by encrusting coralline algae and non-calcareous crusts, giving a pink appearance. This biotope most commonly occurs at the bottom of walls in caves and gullies, where abrasion by cobbles and stones is severe, especially during winter. In some gullies, extreme scouring and abrasion may produce a narrow band of bare coralline algal crust at the very bottom of the walls, with a band of Pomatoceros and or B. crenatus immediately above. Other scour-tolerant species, such as encrusting bryozoans may also be common. Crevices and cracks in the rock provide a refuge for sponge crusts, small Mytilus edulis and occasional Actinia equina, Urticina felina and Sagartia spp. During periods of relative stability in the summer, small quantities of foliose red seaweeds and opportunistic kelps may occur where sufficient light is available; The seaweeds however do not dominate (compare with EIR.FoSwCC).|
|Has Current Version||1|
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