Description of biotope or habitat type
Sabellaria alveolata on variable salinity sublittoral mixed sediment
Habitat (physical) description
|Salinity||Variable (18-35 ppt)|
|Wave exposure||Exposed, Moderately exposed, Sheltered|
|Tidal streams||Strong (3-6 kn), Weak (>1 kn)|
|Substratum||Mixed sandy sediment with pebble and cobbles|
|Depth Band||0-5 m, 5-10 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
Tide-swept sandy mixed sediments with cobbles and pebbles, in variable salinity or fully marine conditions, may be characterised by surface accumulations of the reef building polychaete Sabellaria alveolata. The presence of Sabellaria sp. has a strong influence on the associated infauna as the tubes bind the surface sediments together and provide increased stability. Such reefs may form large structures up to a metre in height although they are considerably less extensive than the intertidal reefs formed by this species (Salv). Other associated species may include the polychaete Melinna cristata, itself often as dense aggregations, mobile surface feeding polychaetes including Typosyllis armillary and Eulalia tripunctata. Other polychaetes may include Mediomastus fragilis and Pygospio elegans whilst amphipods such as Harpinia pectinata and tubificid oligochaetes may also be found.
No situation data available.
No temporal data available.
|Taxon||Relative importance of taxon for defining this community (%)||Typical abundance - SACFOR scale||Typical abundance - (count per m2)||% of core records where taxon was recorded|
|Golfingia vulgaris vulgaris||2||56||41-60 %|
|Eulalia tripunctata||7||Abundant||74||61-80 %|
|Typosyllis armillaris||66||Frequent||4||41-60 %|
|Pygospio elegans||1||Frequent||15||21-40 %|
|Mediomastus fragilis||4||Common||168||41-60 %|
|Sabellaria alveolata||66||Super abundant||1646||81-100 %|
|Melinna cristata||2||Abundant||79||41-60 %|
|Harpinia pectinata||2||Frequent||34||21-40 %|