Modiolus modiolus beds with fine hydroids and large solitary ascidians on very sheltered circalittoral mixed substrata
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Beds or scattered clumps of Modiolus modiolus in generally sheltered conditions with only slight tidal movement. Typically occurs in sealochs and the Shetland voes. Large solitary ascidians (Ascidiella aspersa, Corella parallelogramma, Ciona intestinalis) and fine hydroids (Bougainvillia ramosa, Kirchenpaueria pinnata) present attached to the mussel shells. Decapods such as spider crabs and Munida rugosa typically present. Coralline algal crusts on the mussel shells, with some red seaweeds in shallower water. Aequipecten opercularis often present in moderate abundances. The much richer version of this biotope ModCvar has far more sponges and hydroids growing on and amongst the Modiolus and large numbers of Chlamys varia. Brittlestars Ophiothrix fragilis and Ophiocomina nigra, as well as Ophiopholis aculeata are often common, sometimes forming a dense bed as described in Oph. The biotope ModHo, characterised by Modiolus and holothurians occurs in similar physiographic features, although seems to be in softer sediment in some cases. There may some overlap in these two biotopes as several of the holothurians extend their tentacles above the surface of the sediment for only a limited amount of time during the year.|
|Has Current Version||1|
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