Mixed Laminaria hyperborea and Laminaria ochroleuca forest on exposed infralittoral rock
Quick facts
EUNIS habitat type | code A3.1153 |
---|---|
Bern Convention | Included in a Resolution 4 habitat type at a higher level (A3) |
Description (English)
Mixed Laminaria hyperborea and Laminaria ochroleuca forests on upper infralittoral exposed rock with a dense community of foliose red seaweeds such as Cryptopleura ramosa, and Plocamium cartilagineum as well as small filamentous red seaweeds including Bonnemaisonia asparagoides, Heterosiphonia plumosa, Pterosiphonia parasitica and Brongniartella byssoides. L. hyperborea has a rough stipe which allow dense assemblages of epiphytic red seaweeds to form including the foliose Callophyllis laciniata, Delesseria sanguinea and Hypoglossum hypoglossoides. Unlike L. hyperborea, however, L. ochroleuca has a smooth stipe and so it lacks dense assemblages of epiphytic seaweeds L. ochroleuca has a smooth stipe. Encrusting coralline algae often cover much of the rock surface along with a few brown seaweeds including Dictyota dichotoma, Dictyopteris polypodioides and Desmarestia aculeata present as well. In mixed kelp forest L. ochroleuca may predominate with L. hyperborea more common at shallower depths. Whilst foliose red seaweeds dominate the upward-facing rock beneath the kelp canopy, much of the fauna is restricted to crevices or vertical faces, possibly due to grazing pressure. Echinoderms are often common in this biotope, in particular the sea urchin Echinus esculentus and the starfish Asterias rubens and Marthasterias glacialis. Verticals are colonised by anthozoans including the anthozoans Corynactis viridis, Caryophyllia smithii, Actinothoe sphyrodeta and Alcyonium digitatum, while the bryozoan Membranipora membranacea colonise the Laminaria sp. fronds. This biotope is restricted to the coast of Cornwall and the Isles of Scilly. L. ochroleuca occurs at low abundance in other kelp biotopes (sheltered through to exposed) from Dorset to Lundy Island. In such cases, records should be treated as regional variations of these biotopes. Records should only be assigned to this unit when the canopy is dominated by L. ochroleuca alone, or (more usually) by a mixture of both L. hyperborea and L. ochroleuca (at similar abundance). Both this biotope and unit A3.311 are common on the Brittany and Normandy coasts of France.
Situation: Since L. ochroleuca is less tolerant of wave action than L. hyperborea this biotope commonly occurs below exposed kelp forests (unit A3.1151). On occasion it is found below Alaria esculenta in the sublittoral fringe (units A3.1111 or A3.1112). At some sites a band of dense foliose seaweeds, with no kelp, occurs below the kelp forest (A3.116 or A3.1161) whilst at other sites L. hyperborea kelp park occurs below (A3.1152).
Source: EUNIS habitat classification
Vegetation types
Relation to vegetation types (syntaxa)
Not availableSpecies mentioned in habitat description
Species scientific name | English common name | Species group |
---|---|---|
Delesseria sanguinea | Algae | |
Dictyopteris polypodioides | Algae | |
Dictyota dichotoma | Algae | |
Hypoglossum hypoglossoides | Algae | |
Laminaria hyperborea | Algae | |
Laminaria ochroleuca | Algae | |
Plocamium cartilagineum | Algae | |
Alcyonium digitatum | Invertebrates | |
Asterias rubens | Invertebrates | |
Caryophyllia smithii | Invertebrates | |
Corynactis viridis | Invertebrates | |
Echinus esculentus | Invertebrates | |
Marthasterias glacialis | Invertebrates |
Other classifications
Classification | Code | Habitat type name | Relationship type |
---|---|---|---|
Marine Habitat Classification Britain/Ireland 0405 | IR.HIR.KFaR.LhypR.Loch | Mixed <I>Laminaria hyperborea</I> and <I>Laminaria ochroleuca</I> forest on exposed infralittoral 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 | A3.1153 | Mixed Laminaria hyperborea and Laminaria ochroleuca forest on exposed infralittoral rock | same |
EUNIS Habitat Classification 200308 | A3.2125 | Mixed Laminaria hyperborea and Laminaria ochroleuca forest on moderately exposed or sheltered infralittoral rock | narrower |
EUNIS Habitat Classification 200308 | A3.1153 | Mixed Laminaria hyperborea and Laminaria ochroleuca forest on exposed infralittoral rock | narrower |
EUNIS Habitat Classification 200202 | A3.2125 | Mixed Laminaria hyperborea and Laminaria ochroleuca forest on moderately exposed or sheltered infralittoral rock | overlap |
EUNIS Habitat Classification 200202 | A3.1153 | Mixed Laminaria hyperborea and Laminaria ochroleuca forest on exposed infralittoral rock | overlap |
EUNIS Habitat Classification 199910 | A3.1153 | Mixed Laminaria hyperborea and Laminaria ochroleuca forest on exposed infralittoral rock | overlap |
EUNIS Habitat Classification 199910 | A3.2125 | Mixed Laminaria hyperborea and Laminaria ochroleuca forest on moderately exposed or sheltered infralittoral rock | overlap |
MNCR BioMar 97.06 (Britain & Ireland) | EIR.KFaR.LhypR.Loch | Mixed Laminaria hyperborea and Laminaria ochroleuca forest on exposed infralittoral rock | overlap |
MNCR BioMar 97.06 (Britain & Ireland) | MIR.KR.Lhyp.Loch | Mixed Laminaria hyperborea and Laminaria ochroleuca forest on moderately exposed or sheltered infralittoral rock | overlap |