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Marine Habitat Classification


Description of biotope or habitat type

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   Halcampa chrysanthellum and Edwardsia timida on sublittoral clean stone gravel


Habitat (physical) description

Salinity Full (30-35 ppt)
Wave exposure Moderately exposed, Sheltered, Extremely sheltered
Tidal streams Strong (3-6 kn), Moderately strong (1-3 kn), Weak (>1 kn)
Substratum Clean stone gravel with pebbles
Zone 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.SCS.ICS.HchrEdw <I>Halcampa chrysanthellum</I> and <I>Edwardsia timida</I> on sublittoral clean stone gravel

  • 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

Periodically (seasonally?) disturbed sublittoral stone gravel with small pebbles characterised by the presence of the anemones Halcampa chrysanthellum and Edwardsia timida. Associated species are often typical of a hydroid/bryozoan turf with polychaetes such as Pomatoceros spp. encrusting larger pebbles and low numbers of syllid and phyllodocid polychaetes living interstitially. In some areas this biotope may also contain opportunistic red seaweeds and infauna such as Sabella pavonina. It should be noted that this habitat may show considerable variation in community composition and it is possible that it is a sub-biotope of other gravel biotopes.

Situation

This biotope tends to occur at the entrance to marine inlets where tidal currents are moderately strong.

Temporal variation

The faunal composition and species richness of this biotope may vary seasonally as a result of disturbance from increased wave or tidal action.

Characterising Species

Taxon Relative importance of taxon for defining this community (%) Typical abundance - SACFOR scale % of core records where taxon was recorded
Eudendrium 1 Rare 21-40 %
Nemertesia antennina 1 Rare 21-40 %
Obelia 2 Occasional 21-40 %
Obelia geniculata 2 21-40 %
Alcyonium digitatum 1 Occasional 21-40 %
Cerianthus lloydii 2 Occasional 21-40 %
Urticina felina 2 Occasional 21-40 %
Sagartia elegans 6 Occasional 41-60 %
Halcampa chrysanthellum 11 Rare 61-80 %
Edwardsia claparedii 2 21-40 %
Edwardsia timida 18 Frequent 61-80 %
Eupolymnia nebulosa 1 21-40 %
Lanice conchilega 4 Occasional 41-60 %
Sabella pavonina 1 Rare 21-40 %
Pomatoceros triqueter 6 Frequent 41-60 %
Pagurus bernhardus 4 Rare 41-60 %
Carcinus maenas 2 Occasional 21-40 %
Gibbula cineraria 1 21-40 %
Pecten maximus 1 Rare 21-40 %
Bryozoa 2 Occasional 21-40 %
Alcyonidium diaphanum 5 Occasional 41-60 %
Crossaster papposus 1 21-40 %
Asterias rubens 6 Occasional 41-60 %
Amphipholis squamata 1 21-40 %
Clavelina lepadiformis 1 Rare 21-40 %
Pholis gunnellus 3 Frequent 21-40 %
Dilsea carnosa 1 21-40 %
Chondrus crispus 1 21-40 %
Cryptopleura ramosa 1 21-40 %
Nitophyllum punctatum 1 21-40 %
Polysiphonia stricta 1 21-40 %
Desmarestia aculeata 1 21-40 %
Chorda filum 1 21-40 %
Laminaria saccharina 1 21-40 %

Similar biotopes

Not applicable or unknown.


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