Cushion sponges, hydroids and ascidians on very tide-swept sheltered circalittoral rock
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Often turbid variable salinity water in straits or sounds with low wave exposure where circalittoral communities occur in relatively shallow water. This biotope seems to have close links with the sponge and Alcyonium-rich biotope AlcTub but has been modified by high turbidity, possible organic enrichment and some (slight?) freshwater influence which when combined encourage luxuriant, fast-growing sponges. Large growths of Halichondria bowerbanki, often with Haliclona oculata (although large H. oculata are characteristic of slightly more sheltered conditions in the biotope Flu.Hocu) and Esperiopsis fucorum, various hydroids (particularly Nemertesia spp. and Tubularia indivisa) and ascidians. Typically this biotope occurs where hard substrata is present in the tide-swept narrows / sounds of marine inlets and in particular in the Menai Strait.|
|Has Current Version||1|
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