2. Données et outils
  3. Rechercher un habitat
  4. MC1-252 - Tubes de Polydora sp. sur roche tendre du circalittoral modérément exposée en Atlantique
  5. Description
MC1-252 - Tubes de Polydora sp. sur roche tendre du circalittoral modérément exposée en Atlantique

Polydora sp. tubes on moderately exposed Atlantic circalittoral soft rock
MC1-251 - Pholades avec faune associée clairsemée sur de la craie très tendre ou de l'argile du circalittoral en Atlantique
MC1-253 - Paroi rocheuse calcaire verticale du circalittoral creusée par Hiatella en Atlantique

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Large patches of chalk and soft limestone are occasionally covered entirely by Polydora sp. tubes to the exclusion of almost all other species. This tends to occur in highly turbid conditions and spans the infralittoral and circalittoral in limestone areas such as the Great and Little Ormes (North Wales) and Gower (South Wales). It is even present on the lower shore in the Severn estuary. The boring form of the sponge Cliona celata often riddles the surface layer of the stone. Other sponges present include Halichondria panicea, Haliclona oculata and Hymeniacidon perleve. Polydora sp. also frequently occurs in small patches as part of other biotopes (e.g. unit MC1-216). Other species present include Alcyonium digitatum, Sarcodictyon roseum, the hydroids Halecium halecinum, Abietinaria abietina and Tubularia indivisa, the ascidians Clavelina lepadiformis, Botryllus schlosseri and Morchellium argus, the anemones Urticina felina, Metridium senile and Sagartia elegans and the bryozoans Flustra foliacea and a crisiid turf. The starfish Asterias rubens, the crabs Inachus phalangium and Carcinus maenas, the polychaete Pomatoceros triqueter, the barnacle Balanus crenatus and the brittlestar Ophiothrix fragilis may also be seen. Please note: this biotope may extend into the infralittoral and littoral zone in areas where water turbidity is sufficiently high.

Bibliographie

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