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Marine Habitat Classification


Description of biotope or habitat type

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   Polychaete-rich deep Venus community in offshore mixed sediments


Habitat (physical) description

Salinity Full (30-35 ppt)
Wave exposure Moderately exposed, Sheltered
Tidal streams Weak (>1 kn)
Substratum Gravelly sand and muddy mixed sediment
Zone Circalittoral
Depth Band 20-30 m, 30-50 m, 50-100 m
Other Features

Download comparative physical and biological data. The comparative tables enable a rapid comparison of the species composition and principal physical characteristics between a given set of biotopes.

Distribution of habitat SS.SMx.OMx.PoVen Polychaete-rich deep <I>Venus</I> community in offshore mixed sediments

  • Records used to define the biotope (core records)
  • Other records assigned to this biotope, marked as 'certain'
  • Other records assigned to this biotope, marked as 'uncertain'
  • Predicted extent of the level 3 (for sublittoral rock & deep sea) or 4 (for sublittoral sediment) habitat

Point data based on records in the UK Marine Recorder Snapshot. Predicted habitat extent is from UKSeaMap.

Description

In offshore circalittoral slightly muddy mixed sediments, a diverse community particularly rich in polychaetes with a significant venerid bivalve component may be found. Typical species include the polychaetes Glycera lapidum, Aonides paucibranchiata, Laonice bahusiensis, Mediomastus fragilis, Lumbrineris gracilis, Pseudomystides limbata, Protomystides bidentata and syllid species and bivalves such as Timoclea ovata, Glycymeris glycymeris, Spisula elliptica and Goodallia triangularis. This biotope has been recorded on surveys of the Lambay and Codling Deeps and other areas of the Irish Sea and collectively with MedLumVen comprise the 'Deep Venus Community' and the 'Boreal Off-Shore Gravel Association' as defined by other workers (Ford 1923; Jones 1950). Some examples of this biotope may have abundant juvenile Modiolus modiolus

Situation

No situation data available.

Temporal variation

No temporal data available.

Characterising Species

Taxon Typical abundance - SACFOR scale % of core records where taxon was recorded
Nemertea Abundant 81-100 %
Golfingia 61-80 %
Harmothoe Common 81-100 %
Protomystides bidentata Common 81-100 %
Pseudomystides limbata 81-100 %
Eumida sanguinea Abundant 81-100 %
Nereiphylla lutea Abundant 61-80 %
Glycera lapidum Common 81-100 %
Glycera oxycephala 41-60 %
Syllis 81-100 %
Eusyllis blomstrandi Frequent 81-100 %
Streptosyllis bidentata Frequent 41-60 %
Exogone hebes Frequent 61-80 %
Exogone verugera Frequent 81-100 %
Sphaerosyllis Frequent 61-80 %
Sphaerosyllis bulbosa Frequent 61-80 %
Sphaerosyllis tetralix 81-100 %
Lumbrineris gracilis Common 81-100 %
Aricidea Common 61-80 %
Paradoneis lyra Common 81-100 %
Aonides paucibranchiata Common 81-100 %
Laonice bahusiensis Common 81-100 %
Polydora caulleryi Frequent 81-100 %
Spiophanes kroyeri Frequent 61-80 %
Cirratulidae 61-80 %
Caulleriella alata Frequent 41-60 %
Caulleriella zetlandica Common 61-80 %
Mediomastus fragilis Frequent 81-100 %
Notomastus 81-100 %
Praxillella affinis Common 81-100 %
Asclerocheilus Frequent 81-100 %
Scalibregma inflatum Abundant 41-60 %
Polycirrus Common 81-100 %
Hydroides norvegica Frequent 81-100 %
Grania Common 61-80 %
Anoplodactylus petiolatus 81-100 %
Ampelisca spinipes Frequent 81-100 %
Gammaropsis Frequent 81-100 %
Leptochiton asellus Common 81-100 %
Glycymeris glycymeris Abundant 61-80 %
Modiolus modiolus Super abundant 81-100 %
Mysella bidentata Frequent 61-80 %
Spisula elliptica Common 61-80 %
Abra alba Common 61-80 %
Timoclea ovata Common 81-100 %
Amphipholis squamata Abundant 61-80 %
Polycarpa fibrosa Common 41-60 %

Similar biotopes

Not applicable or unknown.


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