MC2-233 - Moulières à Modiolus modiolus avec fins hydraires et grandes ascidies solitaires sur substrat hétérogène très abrité du circalittoral en Atlantique (EUNIS 2022)

MC2-233 - Moulières à Modiolus modiolus avec fins hydraires et grandes ascidies solitaires sur substrat hétérogène très abrité du circalittoral en Atlantique

Modiolus modiolus beds with fine hydroids and large solitary ascidians on very sheltered Atlantic circalittoral mixed substrata

MC2-232 - Moulières à Modiolus modiolus sur sédiment hétérogène du circalittoral en milieu ouvert en Atlantique

MC2-234 - Moulières à Modiolus modiolus à Mimachlamys varia (anciennement Chlamys varia), éponges, hydraires et bryozoaires sur substrat hétérogène du circalittoral très abrité et soumis à de faibles courants de marée en Atlantique

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Beds or scattered clumps of Modiolus modiolus in generally sheltered conditions with only slight tidal movement. Typically occurs in sealochs and the Shetland voes. Brittlestars Ophiothrix fragilis and Ophiocomina nigra, as well as Ophiopholis aculeata are often frequent, sometimes forming a dense bed as described in MC4-215. The queen scallop Aequipecten opercularis is often present in moderate abundances. Large solitary ascidians (Ascidiella aspersa, Corella parallelogramma, Dendrodoa grossularia) and fine hydroids (Kirchenpaueria pinnata) are present attached to the mussel shells. Decapods such as hermit crabs (Pagurus bernhardus) and spider crabs (Hyas araneus) are typically present. Coralline algal crusts may be found on the mussel shells, with some red seaweeds in shallower water such as Phycodrys rubens. Little information on the infaunal component is given here although it is likely that it is very rich and may highlight more subtle differences in the Modiolus biotopes.

Bibliography

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