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Marine Habitat Classification


Description of biotope or habitat type

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   Sublittoral mixed sediment in variable salinity (estuaries)


Habitat (physical) description

Salinity 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 Muddy gravelly mixed sediment with stones and shells
Zone Infralittoral
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.SMx.SMxVS Sublittoral mixed 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

Shallow sublittoral mixed sediments in estuarine conditions, often with surface shells or stones, enabling the development of diverse epifaunal communities, e.g. Crepidula fornicata (IMX.CreAph), as well as infaunal communities. This biotope complex is therefore often quite species rich, compared with purer sediments.

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
Lepidonotus squamatus 1 41-60 %
Eteone longa 1 41-60 %
Exogone naidina 2 Frequent 41-60 %
Sphaerosyllis 2 Frequent 21-40 %
Nephtys hombergii 6 Common 61-80 %
Scoloplos armiger 2 Common 41-60 %
Polydora ciliata 5 Abundant 41-60 %
Aphelochaeta marioni 22 Common 61-80 %
Caulleriella zetlandica 3 Common 21-40 %
Capitella capitata 1 Frequent 41-60 %
Mediomastus fragilis 6 Frequent 61-80 %
Melinna palmata 2 Common 41-60 %
Tubificoides 1 Frequent 21-40 %
Tubificoides benedii 3 Common 41-60 %
Tubificoides swirencoides 1 Common 21-40 %
Cirripedia 7 Common 21-40 %
Carcinus maenas 7 Occasional 21-40 %
Crepidula fornicata 5 Abundant 61-80 %
Crepidula fornicata 58 Frequent 61-80 %
Cardiidae 20 21-40 %
Abra alba 1 Common 21-40 %
Abra nitida 1 Common 21-40 %

Similar biotopes

Not applicable or unknown.

Biotope history

Classification Habitat code
97.06 IMX.EstMx

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