Description of biotope or habitat type
Arenicola marina in infralittoral fine sand or muddy sand
Habitat (physical) description
|Salinity||Full (30-35 ppt), Variable (18-35 ppt)|
|Wave exposure||Moderately exposed, Sheltered, Very sheltered, Extremely sheltered|
|Tidal streams||Moderately strong (1-3 kn), Weak (>1 kn), Very weak (negligible)|
|Substratum||Fine to very fine sand and muddy sand|
|Depth Band||0-5 m, 5-10 m, 10-20 m|
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.
- 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
In shallow fine sand or non-cohesive muddy sand in fully marine conditions (or occasionally in variable salinity) a community characterised by the polychaete Arenicola marina may occur. This biotope appears quite faunally sparse. Those other taxa present however, include scavenging crustacea such as Pagurus bernhardus and Liocarcinus depurator, terebellid polychaetes such as Lanice conchilega and the burrowing anemone Cerianthus lloydii. Occasional Sabella pavonina and frequent Ensis spp. may also be observed in some areas. The majority of records for this biotope are derived from epifaunal surveys and consequently there is little information available for the associated infaunal species. It is possible that this biotope, like EcorEns (to which it is broadly similar) is an epibiotic overlay on other biotopes from the SSA complex.
No situation data available.
At certain times of the year a diatom film may be present on the sediment surface.
|Taxon||Relative importance of taxon for defining this community (%)||Typical abundance - SACFOR scale||% of core records where taxon was recorded|
|Hydractinia echinata||1||Occasional||21-40 %|
|Cerianthus lloydii||2||Frequent||21-40 %|
|Capitella capitata||91||Common||61-80 %|
|Arenicola marina||9||Abundant||61-80 %|
|Arenicola marina||55||Common||81-100 %|
|Lanice conchilega||5||Occasional||41-60 %|
|Sabella pavonina||1||Occasional||21-40 %|
|Pagurus bernhardus||10||Occasional||61-80 %|
|Liocarcinus depurator||2||Occasional||21-40 %|
|Carcinus maenas||2||Occasional||21-40 %|
|Diatoms - film||9||Common||21-40 %|