Skip to Content

Marine Habitat Classification


Description of biotope or habitat type

To understand more about what this page is describing, see How to use the classification. See also How to cite.

   Sublittoral coarse sediment in variable salinity (estuaries)


Physical habitat description

Salinity Reduced (18-30ppt), Variable (18-35 ppt)
Wave exposure Moderately exposed, Sheltered, Very sheltered
Tidal streams Strong (3-6 kn), Moderately strong (1-3 kn), Weak (>1 kn), Very weak (negligible)
Substratum Pebbles and gravel with a minor sand fraction
Zone Circalittoral, Infralittoral
Depth Band 0-5 m, 5-10 m, 10-20 m
Other Features

Biotope origin

Derived using data from Video/Day Grab
Faunal group Epifauna/Infauna

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.SCS.SCSVS Sublittoral coarse sediment in variable salinity (estuaries)

  • 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

Clean gravels that occur in the upper reaches of marine inlets, especially estuaries, where water movement is sufficiently strong to remove the silt content of the sediment. The habitat typically lacks a significant seaweed component and is characterised by a sparse but very robust brackish-water tolerant fauna.

Situation

No situation data available.

Temporal variation

No situation data available.

Characterising species

Taxon Relative importance of taxon for defining this community (%) Typical abundance - SACFOR scale % of core records where taxon was recorded
Carcinus maenas 33 Rare 41-60%
Pomatoschistus 67 Occasional 41-60%

Similar biotopes or habitat types

Not applicable or unknown.

Classification history of this biotope or habitat type

Classification version Code Habitat name
2015 (15.03) SS.SCS.SCSVS Sublittoral coarse sediment in variable salinity (estuaries)
2004 (04.05) SS.SCS.SCSVS Sublittoral coarse sediment in variable salinity (estuaries)
1997 (97.06) Part of SS.IGS.EstGS Estuarine sublittoral gravels and sands

Back to top