Mixed Laminaria hyperborea and Laminaria ochroleuca forest on exposed infralittoral rock

English name: 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 available

Species mentioned in habitat description

Invertebrates Actinothoe sphyrodeta
Invertebrates Alcyonium digitatum
Invertebrates Asterias rubens
Algae Bonnemaisonia asparagoides
Algae Brongniartella byssoides
Algae Callophyllis laciniata
Invertebrates Caryophyllia smithii
Invertebrates Corynactis viridis
Algae Cryptopleura ramosa
Algae Delesseria sanguinea
Algae Desmarestia aculeata
Algae Dictyopteris polypodioides
Algae Dictyota dichotoma
Invertebrates Echinus esculentus
Algae Heterosiphonia plumosa
Algae Hypoglossum hypoglossoides
Algae Laminaria hyperborea
Algae Laminaria ochroleuca
Invertebrates Marthasterias glacialis
Invertebrates Membranipora membranacea
Algae Plocamium cartilagineum
Algae Pterosiphonia parasitica
Species scientific name English common name Species group
Actinothoe sphyrodeta Invertebrates
Alcyonium digitatum Invertebrates
Asterias rubens Invertebrates
Bonnemaisonia asparagoides Algae
Brongniartella byssoides Algae
Callophyllis laciniata Algae
Caryophyllia smithii Invertebrates
Corynactis viridis Invertebrates
Cryptopleura ramosa Algae
Delesseria sanguinea Algae
Desmarestia aculeata Algae
Dictyopteris polypodioides Algae
Dictyota dichotoma Algae
Echinus esculentus Invertebrates
Heterosiphonia plumosa Algae
Hypoglossum hypoglossoides Algae
Laminaria hyperborea Algae
Laminaria ochroleuca Algae
Marthasterias glacialis Invertebrates
Membranipora membranacea Invertebrates
Plocamium cartilagineum Algae
Pterosiphonia parasitica Algae

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
For relation to plant communities (syntaxa), see Vegetation types

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
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