Antedon spp., solitary ascidians and fine hydroids on sheltered circalittoral rock
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Typically found in sheltered parts of sealochs which might be subject to slight tidal currents. No one phyla or species dominates the rock but the most conspicuous comprise featherstars (Antedon bifida, Antedon petasus and more rarely Leptometra celtica), solitary ascidians (e.g. Ascidia mentula) and fine hydroids (Kirchenpaueria pinnata, Halecium halecinum and Bougainvillia ramosa). In the sealochs, where the three species of featherstar are found at the same site Antedon petasus is often the more abundant featherstar in deeper water whereas A. bifida tends to dominate the shallower regions. Leptometra celtica tends to occur in deep water and is also found on rocks on mud plains. Caryophyllia smithii, serpulid worms, Balanus balanus, Munida rugosa, brachiopods, some brittlestars, and algal crusts are all typically present. Crustose sponges such as Hymedesmia paupertas may occur on vertical faces. In deep water at some sites in sealochs Mycale lingua and Leptometra celtica are found on upward facing rock. This biotope has some overlaps with the solitary ascidian biotopes (As) although these tend to occur is slightly more sheltered conditions with little or no tidal flow.|
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