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  4. MC1-213 - Tapis de bryozoaires et éponges dressées sur roche du circalittoral soumise aux courants de marée en Atlantique
  5. Description
MC1-213 - Tapis de bryozoaires et éponges dressées sur roche du circalittoral soumise aux courants de marée en Atlantique

Bryozoan turf and erect sponges on tide-swept Atlantic circalittoral rock
MC1-212 - Tubularia indivisa sur roche du circalittoral soumise aux courants de marée en Atlantique
MC1-214 - Corynactis viridis et tapis mixte de crisiidés, Bugula, Scrupocellaria et Cellaria sur roche du circalittoral exposée modérément soumise aux courants de marée en Atlantique

Classification des habitats EUNIS 2022

Descriptif de l'habitat

This biotope is typically found on wave-exposed circalittoral bedrock or boulders subject to tidal streams ranging from moderately strong to strong. It often has a thin layer of silt covering the seabed, and is characterised by a bryozoan/hydroid turf with erect sponges. Typical bryozoans to be found include crisiids, Alcyonidium diaphanum, Flustra foliacea, Pentapora foliacea, Bugula plumosa and Bugula flabellata, while typical hydroids include Nemertesia antennina, Nemertesia ramosa and Halecium halecinum. The soft coral Alcyonium digitatum is frequently recorded on the tops of boulders and rocky outcrops. Characteristic erect sponges include Raspailia ramosa, Stelligera stuposa and Stelligera rigida ; other sponges present include Cliona celata, Dysidea fragilis, Pachymatisma johnstonia, Polymastia boletiformis, Hemimycale columella, Esperiopsis fucorum, Polymastia mamillaris and Tethya aurantium. Other species present include Caryophylia smithii, Actinothoe sphyrodeta, Corynactis viridis, Urticina felina, Balanus crenatus, Asterias rubens, Marthasterias glacialis, Henricia oculata, Echinus esculentus, Clavelina lepadiformis, Calliostoma zizyphinum and Necora puber. Three variants of this biotope have been described, but all are characterised by a bryozoan turf with erect sponges. MC1-2131 is found primarily on circalittoral bedrock and is dominated by the seafan Eunicella verrucosa. Unit MC1-2132 is found under slightly stronger tide-swept conditions, and is characterised particularly by the sponge D. fragilis and the anemone A. sphyrodeta. Finally unit MC1-2133 is characterised by the anemone Sagartia elegans.

Bibliography

European Topic Centre on Biological Diversity 2022. EUNIS marine habitat classification 2022 including crosswalks. Table Excel. (Source)