Macoma balthica and Abra alba in infralittoral muddy sand or mud
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Near-shore shallow muddy sands and muds, and sometimes mixed sediments, may be characterised by the presence of the bivalve Macoma balthica. Abra alba, Lagis koreni and Donax vittatus may also be significant components although they may not necessarily all occur simultaneously. Fabulina fabula, Nephtys cirrosa, Echinocardium cordatum and Crangon crangon may also be present. The community is especially stable (Dewarumez et al. 1992). The substratum is typically rich in organic content and the community may occur in small patches or swathes in shallow waters parallel to the shore (Jones 1950; Cabioch & Glaçon 1975). This biotope is known to occur in patches between Denmark and the western English Channel. This community has been included in the 'Boreal Offshore Muddy Sand Association' of Jones (1950) and is also described by several other authors (Petersen 1918; Cabioch & Glaçon 1975). A similar community may occur in deep water in the Baltic (Thorson 1957). This biotope may occur in slightly reduced salinity estuarine conditions where Mya sp. may become a significant member of the community (Thorson 1957). Sites with IMS.MacAbr may give over to neighbouring Amphiura biotopes with time (E.I.S. Rees pers. comm. 1996).|
|Has Current Version||1|
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