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Marine Habitat Classification

Description of biotope or habitat type

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   Potamogeton pectinatus community

Physical habitat description

Salinity Variable (18-35 ppt), Low (<18ppt)
Wave exposure Extremely sheltered
Tidal streams Very weak (negligible)
Substratum Mud and sandy mud (often with some stones and shells)
Zone Infralittoral, Sublittoral fringe
Depth Band 0-5 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.Ang.NVC A12 <I>Potamogeton pectinatus</I> community

  • 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.


Low and variable salinity infralittoral mud with beds of Potamogeton pectinatus. Other associated species are broadly similar to that of Rup, with blankets of filamentous green algae such as Enteromorpha intestinalis, Cladophora liniformis and Rhizoclonium riparium. The grazing gastropod Potamopyrgus antipodarum is found in this biotope and juvenile Mytilus edulis have been observed settled on Potamogeton leaves and amongst the algae. The nationally scarce charaphyte Lamprothamnium papulosum may be found to some extent in this biotope but more often in neighbouring habitats (see Plaza & Sanderson 1997). Mysids, trout (Salmo trutta), and sticklebacks Gasterosteus aculeatus can be found swimming amongst the vegetation. Mya arenaria may be found in some examples of this biotope, but the infaunal component of this biotope requires further investigation but is likely to contain oligochaetes, Arenicola marina, Corophium volutator and Gammarus spp.


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
Potamogeton pectinatus 8 Common 21-40 %
Mysidae 25 Frequent 41-60 %
Hydrobia ulvae 1 Occasional 1-20 %
Potamopyrgus antipodarum 23 Frequent 41-60 %
Mytilus edulis 4 Occasional 21-40 %
Salmo trutta 2 Occasional 1-20 %
Gasterosteus aculeatus 1 Occasional 21-40 %
Enteromorpha intestinalis 2 Frequent 1-20 %
Cladophora liniformis 4 Frequent 21-40 %
Filamentous green algae 2 Occasional 1-20 %
Chara aspera 3 Frequent 1-20 %
Potamogeton 26 Frequent 61-80 %

Similar biotopes or habitat types

Similar associated species but Ruppia, if present in NVC A12, does not form distinct beds.

Classification history of this biotope or habitat type

Classification version Code
97.06 IMU.NVC A12
96.7 IMU.Pot

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