Biodiversity & Conservation

Polydora ciliata, Mya truncata and solitary ascidians in variable salinity infralittoral mixed sediment.

SS.IMX.EstMx.PolMtru


<i>%Polydora ciliata%</i>, <i>%Mya truncata%</i> and solitary ascidians in variable salinity infralittoral mixed sediment.
Distribution map

SS.IMX.EstMx.PolMtru recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)


  • EC_Habitats

Text page icon Habitat description

Map icon Distribution of biotope in Britain and Ireland Found off Hartlepool on the north east coast, in several river channels of the south coast of Britain and Milford Haven, Wales.
National importance Not available

Text page icon Description of biotope

For a full description of this biotope including characterizing species, distribution, survey information and references visit JNCC

Variable salinity mixed muddy sediment characterized 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 Aphelochaeta 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 characterizing molluscs have to occur to divide a 'bed' from shell debris. This biotope may be associated with IMX.VsenMtru. (Information taken from the Marine Biotope Classification for Britain and Ireland, Version 97.06: Connor et al., 1997a, b).

Additional information icon Additional information

None entered


This review can be cited as follows:

Tyler-Walters, H. 2002. Polydora ciliata, Mya truncata and solitary ascidians in variable salinity infralittoral mixed sediment.. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 25/10/2014]. Available from: <http://www.marlin.ac.uk/habitatsbasicinfo.php?habitatid=114&code=1997>