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Concept

Coralline crusts in surge gullies and scoured infralittoral rock

URI http://vocab.nerc.ac.uk/collection/M20/current/JNCCMNCR00001105/1/
Within Vocab Marine Habitat Classification for Britain and Ireland Version 04.05
Alternative Labels IR.FIR.SG.CC
Definition Scoured rock in wave-surged caves, tunnels or gullies often looks rather bare, and may be characterised by a limited scour-tolerant fauna of Balanus crenatus and/or Pomatoceros triqueter with spirorbid polychaetes. In areas where sufficient light is available and scour is severe, encrusting coralline algae and non-calcareous crusts cover the rock surface, 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 produces a narrow band of bare coralline algal crust at the very bottom of the walls, with a band of P. triqueter 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 such as Halichondria panicea and occasional anemones Urticina felina and Sagartia elegans. More mobile fauna is usually restricted to the echinoderms Asterias rubens and Echinus esculentus as well as the crab Cancer pagurus. Two variants have been identified: Wave-surged bedrock with coralline crust, B. crenatus and P. triqueter (CC.BalPom) and coralline crusts on mobile boulders in severely scoured caves (CC.Mo).
Date 2018-02-13T18:42:27
Identifier SDN:M20::JNCCMNCR00001105
Note accepted
Is Version Of JNCCMNCR00001105
version 1

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