Description of biotope or habitat type
Nephtys cirrosa and Macoma balthica in variable salinity infralittoral mobile sand
Habitat (physical) description
|Salinity||Variable (18-35 ppt)|
|Wave exposure||Moderately exposed, Sheltered|
|Tidal streams||Moderately strong (1-3 kn), Weak (>1 kn)|
|Substratum||Medium to very fine sand|
|Depth Band||0-5 m, 5-10 m, 10-20 m|
|Other Features||Surface veneer of mud may be present at slack water|
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
Mobile sand in variable salinity conditions where tidal currents create an unstable shifting habitat. Characteristic species include the polychaetes Nephtys cirrosa and Scoloplos armiger along with amphipods of the genus Bathyporeia and Haustorius arenarius. The bivalve Macoma balthica may occur in more stable examples of this biotope, although not in the abundances found in the NhomMac. The biotope contains relatively few species, each typically in low to moderate abundance. It is found in tidal channels with moderate tidal streams. Care should be taken in identification of this biotope due to the presence juveniles and species washed in during slack water.
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|
|Nephtys cirrosa||59||Common||22||61-80 %|
|Scoloplos armiger||6||Abundant||5||21-40 %|
|Capitella capitata||2||4||21-40 %|
|Bathyporeia pelagica||2||Frequent||9||1-20 %|
|Bathyporeia pilosa||13||Frequent||90||21-40 %|
|Haustorius arenarius||4||Frequent||14||21-40 %|
|Macoma balthica||5||Frequent||7||21-40 %|