Alcyonium digitatum, Pomatoceros triqueter, algal and bryozoan crusts on wave-exposed circalittoral rock
Description (English)
This variant is typically found on the vertical, steep and upper faces of wave-exposed circalittoral bedrock or boulders subject to varying amounts of current. The variant has a very grazed, sparse appearance, dominated only by the presence of Alcyonium digitatum and large expanses of encrusting red alage and bryozoan crusts particularly (Parasmittina trispinosa). The sparse appearance can be attributed to the frequently observed sea urchin Echinus esculentus. The polychaete Pomatoceros triqueter can be locally abundant, and may in some cases cover far more rock surface than A. digitatum, especially on vertical faces. Clumps of robust hydroids such as Abietinaria abietina occur occasionally. Other species present include the echinoderms Asterias rubens, Henricia sanguinolenta, Ophiothrix fragilis, the anemone Urticina felina, Calliostoma zizyphinum and Cancer pagurus.
Situation: Shallower than this biotope, dense kelp forest is typically found, containing species such as Laminaria hyperborea and Alaria esculentus. Occasionally, this biotope may be found on rocky outcrops surrounding by coarse sand. With this increased scour, A4.213 may develop at the rock/sand interface. Below this biotope, coarse sediments, muddy gravel and sand are typically recorded.
Source: EUNIS habitat classification
Quick facts
EUNIS habitat type | code A4.2142 |
---|---|
Bern Convention | Included in a Resolution 4 habitat type at a higher level (A4) |
Vegetation types
Relation to vegetation types (syntaxa)
Not availableSpecies mentioned in habitat description
Species scientific name | English common name | Species group |
---|---|---|
Laminaria hyperborea | Algae | |
Abietinaria abietina | Invertebrates | |
Alcyonium digitatum | Invertebrates | |
Asterias rubens | Invertebrates | |
Calliostoma zizyphinum | Invertebrates | |
Cancer pagurus | Invertebrates | |
Echinus esculentus | Invertebrates | |
Ophiothrix fragilis | Invertebrates |
Other classifications
Classification | Code | Habitat type name | Relationship type |
---|---|---|---|
Marine Habitat Classification Britain/Ireland 0405 | CR.MCR.EcCr.FaAlCr.Adig | <I>Alcyonium digitatum</I>, <I>Pomatoceros triqueter</I>, algal and bryozoan crusts on wave-exposed circalittoral rock | source |
CORINE Land Cover | 5.2.3. | Sea and ocean | n/a |
History
Classification | Code | Habitat type name | Relationship type |
---|---|---|---|
EUNIS Habitat Classification 200410 | A4.2142 | Alcyonium digitatum, Pomatoceros triqueter, algal and bryozoan crusts on wave-exposed circalittoral rock | same |
EUNIS Habitat Classification 200308 | A3.524 | Alcyonium digitatum, Pomatoceros triqueter, algal and bryozoan crusts on vertical exposed circalittoral rock | narrower |
EUNIS Habitat Classification 200308 | A3.241 | Alcyonium digitatum and a bryozoan, hydroid and ascidian turf on vertical moderately exposed infralittoral rock | overlap |
EUNIS Habitat Classification 200202 | A3.524 | Alcyonium digitatum, Pomatoceros triqueter, algal and bryozoan crusts on vertical exposed circalittoral rock | narrower |
EUNIS Habitat Classification 200202 | A3.241 | Alcyonium digitatum and a bryozoan, hydroid and ascidian turf on vertical moderately exposed infralittoral rock | narrower |
EUNIS Habitat Classification 199910 | A3.241 | Alcyonium digitatum and a bryozoan, hydroid and ascidian turf on vertical moderately exposed infralittoral rock | narrower |
EUNIS Habitat Classification 199910 | A3.524 | Alcyonium digitatum, Pomatoceros triqueter, algal and bryozoan crusts on vertical exposed circalittoral rock | narrower |
MNCR BioMar 97.06 (Britain & Ireland) | ECR.Alc.AlcC | Alcyonium digitatum, Pomatoceros triqueter, algal and bryozoan crusts on vertical exposed circalittoral rock | narrower |
MNCR BioMar 97.06 (Britain & Ireland) | IR.FaSwV.AlcByH | Alcyonium digitatum and a bryozoan, hydroid and ascidian turf on vertical moderately exposed vertical infralittoral rock | narrower |