Abra alba, Nucula nitida and Corbula gibba in circalittoral muddy sand or slightly mixed sediment
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Muddy sands or slightly mixed sediments in sheltered or slightly reduced salinity environments may be characterised by the presence of the bivalves Abra alba, Nucula nitidosa and Corbula gibba as well as N. nucleus, Lagis koreni and Nephtys sp. The echinoderms Echinocardium cordatum, Ophiura albida and Ophiura ophiura may also be present. Sandier habitats contain the CMS.AfilEcor biotope and increasing silt (and depth) gives rise to the CMU.BriAchi biotope. The relative density of the characterising species in this biotope is known to vary from year to year (Molander 1962); Nucula nitidosa can, in some cases, be at least if not more prevalent than Abra alba (Salzwedel, Rachor & Gerdes 1985).
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