Polydora ciliata, Mya truncata and solitary ascidians in variable salinity infralittoral mixed sediment
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Variable salinity mixed muddy sediment characterised by the polychaetes Polydora ciliata, Aphelochaeta marioni, the bivalve molluscs Abra nitida and Mya truncata and the ascidians Ascidiella aspersa, Ascidiella scabra, Molgula sp. and Dendrodoa grossularia (the ascidians may not be recorded adequately by remote infaunal surveys). This biotope occurs in lower estuary mixed muddy sediments which are relatively stable, even though subject to moderate tidal streams. It may be found adjacent to IMU.AphTub, IMX.CreAph, IMX.Ost and IMX.MytV. It may also (as yet unproven) represent the infaunal component of SCR.Aasp. It is similar to IMU.AphTub, separated by a combination of sediment characteristics and the abundance of A. marioni. Some difficulty may arise in distinguishing this biotope from reduced versions of IMX.CreAph, IMX.Ost and IMX.MytV as it is unclear at what density the characterising molluscs have to occur to divide a 'bed' from shell debris. This biotope may be associated with IMX.VsenMtru.|
|Has Current Version||1|
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