Serpula vermicularis reefs on very sheltered circalittoral muddy sand
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Large clumps (mini 'reefs') of the calcareous tubes of Serpula vermicularis, typically attached to stones on muddy sediment in very sheltered conditions in sealochs. A rich associated biota attached to the calcareous tube may include Esperiopsis fucorum, thin encrusting sponges, the ascidians Ascidiella aspersa, Pyura microcosmus and Diplosoma listerianum and fine hydroids such as Halopteris catharina. In shallow water dense Phycodrys rubens may grow on the 'reefs'. Reefs from Loch Creran have been recently studied (Moore 1996). The only other known site in UK for these reefs is Loch Sween, where they are reported to have deteriorated. Otherwise only known from Salt Lake, Cliffden and Killary Harbour, Co. Galway.
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