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Marine Habitat Classification


Description of biotope or habitat type

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   Anemones, including Corynactis viridis, crustose sponges and colonial ascidians on very exposed or wave surged vertical infralittoral rock


Habitat (physical) description

Salinity Full (30-35 ppt)
Wave exposure Extremely exposed, Very exposed, Exposed, Moderately exposed
Tidal streams Moderately strong (1-3 kn), Weak (>1 kn), Very weak (negligible)
Substratum Bedrock
Zone Infralittoral
Depth Band 0-5 m, 5-10 m, 10-20 m, 20-30 m
Other Features Wave surged vertical rock; in surge gullies and caves.

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 IR.FIR.SG.CrSpAsAn Anemones, including <I>Corynactis viridis</I>, crustose sponges and colonial ascidians on very exposed or wave surged vertical infralittoral rock

  • 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

Vertical very exposed and exposed bedrock gullies, tunnels and cave entrances subject to wave-surge dominated by sponge crusts such as Clathrina coriacea, Myxilla incrustans, Pachymatisma johnstonia and Halichondria panicea and anthozoans such as Sagartia elegans, Urticina felina, Alcyonium digitatum, Corynactis viridis and dwarf Metridium senile generally dominate the area; the anthozoans often appearing to protrude through the sponge layer. There may be dense aggregations of the hydroid Tubularia indivisa, the cup coral Caryophyllia smithii and the colonial ascidians Botrylloides leachi and Polyclinum aurantium. There may be a short crisiid turf, interspersed with Scrupocellaria reptans. Encrusting coralline algae may occur on well-illuminated rock faces. The echinoderms Asterias rubens, Marthasterias glacialis, Echinus esculentus, Antedon bifida and Ophiothrix fragilis, the topshell Calliostona zizphinum and the calcareous tubeworm Pomatoceros triqueter may also be present on the rock face. The crabs Cancer pagurus and Necora puber may also be recorded. Due to the wave-surged nature and vertical orientation of these biotopes, kelps are rare and certainly never dominate.

Situation

No situation data available.

Temporal variation

Unknown.

Characterising Species

Taxon Relative importance of taxon for defining this community (%) Typical abundance - SACFOR scale % of core records where taxon was recorded
Clathrina coriacea 3 Occasional 61-80 %
Pachymatisma johnstonia 3 Occasional 21-40 %
Halichondria panicea 1 Frequent 41-60 %
Myxilla incrustans 2 Frequent 41-60 %
Porifera indet crusts 2 Frequent 41-60 %
Tubularia indivisa 4 Frequent 61-80 %
Alcyonium digitatum 5 Occasional 61-80 %
Urticina felina 1 Occasional 41-60 %
Metridium senile 4 Frequent 41-60 %
Sagartia elegans 5 Frequent 61-80 %
Corynactis viridis 14 Common 81-100 %
Caryophyllia smithii 2 Occasional 41-60 %
Pomatoceros triqueter 1 Occasional 21-40 %
Cancer pagurus 3 Occasional 61-80 %
Necora puber 1 Occasional 41-60 %
Calliostoma zizyphinum 4 Occasional 61-80 %
Crisiidae 2 Frequent 41-60 %
Scrupocellaria reptans 2 Common 41-60 %
Bryozoa indet crusts 3 Frequent 41-60 %
Antedon bifida 1 Occasional 41-60 %
Asterias rubens 4 Occasional 61-80 %
Marthasterias glacialis 1 Occasional 41-60 %
Ophiothrix fragilis 1 Occasional 21-40 %
Echinus esculentus 2 Occasional 41-60 %
Polyclinum aurantium 1 Frequent 41-60 %
Didemnidae 2 Frequent 21-40 %
Botrylloides leachi 2 Occasional 41-60 %
Corallinaceae 3 Frequent 41-60 %

Similar biotopes

Not applicable or unknown.

Biotope history

Classification Habitat code
96.7 ELR.BPat.Lpyg
6.95 LRK.LPYG

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