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Marine Habitat Classification


Description of biotope or habitat type

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   Laminaria saccharina with Psammechinus miliaris and/or Modiolus modiolus on variable salinity infralittoral mixed sediment


Habitat (physical) description

Salinity Full (30-35 ppt), Variable (18-35 ppt)
Wave exposure Sheltered, Very sheltered, Extremely sheltered
Tidal streams Moderately strong (1-3 kn), Weak (>1 kn), Very weak (negligible)
Substratum Stoney mixed sediment
Zone Infralittoral, Sublittoral fringe
Depth Band 0-5 m, 5-10 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.SMp.KSwSS.LsacMxVS <I>Laminaria saccharina</I> with <I>Psammechinus miliaris</I> and/or <I>Modiolus modiolus</I> on variable salinity infralittoral mixed sediment

  • 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

Shallow kelp community found on stoney mixed sediment, in full or variable salinity, in sheltered or moderately exposed conditions, with weak or very weak tidal currents. The community is characterised by a dense covering of Laminaria saccharina. Beneath the kelp canopy, frequent Psammechinus miliaris may be found grazing the algal turf and scattered Modiolus modiolus are characteristic of this biotope. Encrusting the suface of stones and pebbles are Pomatoceros triqueter and in the sediment between the stones, the burrowing anemone Cerianthus lloydii may also be present. Small patches of Lithothamnion glaciale may be found in this biotope, although these patches do not form distict beds as in SBR.Lgla. In addition, a more ubiquitous fauna such as Asterias rubens and Pagurus bernhardus are also present. This biotope is generally found in sealochs.

Situation

No situation data available.

Temporal variation

No temporal data available.

Characterising Species

Taxon Relative importance of taxon for defining this community (%) Typical abundance - SACFOR scale % of core records where taxon was recorded
Cerianthus lloydii 5 Common 41-60 %
Metridium senile 2 Occasional 21-40 %
Pomatoceros triqueter 8 Frequent 61-80 %
Pagurus bernhardus 9 Occasional 61-80 %
Carcinus maenas 2 Occasional 41-60 %
Buccinum undatum 3 Occasional 41-60 %
Modiolus modiolus 5 Occasional 61-80 %
Mya truncata 1 Occasional 21-40 %
Asterias rubens 8 Occasional 61-80 %
Psammechinus miliaris 10 Frequent 61-80 %
Gobiusculus flavescens 2 Common 21-40 %
Corallinaceae 3 Frequent 41-60 %
Lithothamnion glaciale 3 Frequent 41-60 %
Phycodrys rubens 3 Frequent 41-60 %
Polysiphonia elongata 1 Occasional 21-40 %
Chorda filum 2 Occasional 41-60 %
Laminaria saccharina 20 Common 81-100 %

Similar biotopes

Not applicable or unknown.

Biotope history

Classification Habitat code
96.7 SCR.MetAs

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