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Marine Habitat Classification


Description of biotope or habitat type

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   Sagartiogeton undatus and Ascidiella aspersa on infralittoral sandy mud


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 sandy mud
Zone Circalittoral, Infralittoral
Depth Band 0-5 m, 5-10 m, 10-20 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.SMu.ISaMu.SundAasp <I>Sagartiogeton undatus</I> and <I>Ascidiella aspersa</I> on infralittoral sandy mud

  • 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

Sheltered sublittoral mud or sandy mud in shallow water with relatively few conspicuous species may be characterised by the anemone Sagartiogeton undatus in low numbers and the tunicate Ascidiella aspersa. Other taxa may include Carcinus maenas, Pagurus bernhardus and terebellid polychaetes. The burrowing anemones Cerianthus lloydii may also be found occasionally. The status of this biotope is uncertain at present as it is not known whether it is an impoverished, disturbed or epifaunal variant of other sheltered, shallow mud biotopes such as PhiVir or if the areas in which it has been recorded have been incompletely surveyed.

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
Hydractinia echinata 3 Occasional 21-40 %
Cerianthus lloydii 3 Occasional 21-40 %
Metridium senile 2 Rare 21-40 %
Sagartiogeton undatus 24 Occasional 61-80 %
Terebellidae 4 Occasional 41-60 %
Myxicola infundibulum 2 Occasional 21-40 %
Pagurus bernhardus 6 Occasional 41-60 %
Liocarcinus depurator 3 Occasional 21-40 %
Carcinus maenas 18 Occasional 61-80 %
Buccinum undatum 1 Rare 21-40 %
Asterias rubens 3 Occasional 41-60 %
Ascidiella aspersa 7 Frequent 41-60 %
Gobius niger 1 Occasional 21-40 %
Pomatoschistus 3 Occasional 21-40 %
Pomatoschistus minutus 1 Occasional 21-40 %

Similar biotopes

Not applicable or unknown.


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