Laminaria hyperborea forest, foliose red seaweeds and a diverse fauna on tide-swept upper infralittoral rock

English name: Laminaria hyperborea forest, foliose red seaweeds and a diverse fauna on tide-swept upper infralittoral rock

Quick facts

EUNIS habitat type code A3.2121
Bern Convention Included in a Resolution 4 habitat type at a higher level (A3)

Description (English)

Exposed to moderately exposed, tide-swept bedrock and boulders, with dense Laminaria hyperborea forest, characterised by a rich under-storey and stipe flora of foliose seaweeds. The kelp stipes support epiphytes such as Callophyllis laciniata, Corallina officinalis, Cryptopleura ramosa, Membranoptera alata, and Phycodrys rubens. At some sites, instead of being covered by red seaweeds, the kelp stipes are heavily encrusted by the ascidians Botryllus schlosseri and in the south-west Distomus variolosus. Epilithic seaweeds (Dilsea carnosa, Hypoglossum hypoglossoides, Delesseria sanguinea, Plocamium cartilagineum, Brongniartella byssoides, and Dictyota dichotoma ) and crustose seaweeds commonly occur beneath the kelp. The kelp fronds are often covered with growth of the hydroid Obelia geniculata or the bryozoan Membranipora membranacea. Although these species are also found in most kelp forests, in this biotope they are particularly dense. On the rock surface, a rich fauna comprising of the sponges Pachymatisma johnstonia, Halichondria panicea, Esperiopsis fucorum and Dysidea fragilis, anthozoans such as Urticina felina, Alcyonium digitatum and Caryophilia smithii, the barnacle Balanus crenatus, colonial ascidians such as Clavelina lepadiformis, and the gastropods Calliostoma zizyphinum and Gibbula cineraria, occur. Also found on the rock is the echinoderm Asterias rubens and the crab Cancer pagurus.
Situation: This biotope occurs below Alaria esculenta (unit A3.111) at exposed sites or L. digitata (unit A3.2111) at moderately exposed locations. With increasing depth the kelp density diminishes to become tide-swept kelp park (unit A3.2122).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Alaria esculenta
Algae Brongniartella byssoides
Algae Callophyllis laciniata
Algae Corallina officinalis
Algae Cryptopleura ramosa
Algae Delesseria sanguinea
Algae Dictyota dichotoma
Algae Dilsea carnosa
Algae Hypoglossum hypoglossoides
Algae Laminaria hyperborea
Algae Membranoptera alata
Algae Phycodrys rubens
Algae Plocamium cartilagineum
Invertebrates Alcyonium digitatum
Invertebrates Asterias rubens
Invertebrates Balanus crenatus
Invertebrates Botryllus schlosseri
Invertebrates Calliostoma zizyphinum
Invertebrates Cancer pagurus
Invertebrates Clavelina lepadiformis
Invertebrates Distomus variolosus
Invertebrates Dysidea fragilis
Invertebrates Esperiopsis fucorum
Invertebrates Gibbula cineraria
Invertebrates Halichondria panicea
Invertebrates Membranipora membranacea
Invertebrates Obelia geniculata
Invertebrates Pachymatisma johnstonia
Invertebrates Urticina felina
Species scientific name English common name Species group
Alaria esculenta Algae
Brongniartella byssoides Algae
Callophyllis laciniata Algae
Corallina officinalis Algae
Cryptopleura ramosa Algae
Delesseria sanguinea Algae
Dictyota dichotoma Algae
Dilsea carnosa Algae
Hypoglossum hypoglossoides Algae
Laminaria hyperborea Algae
Membranoptera alata Algae
Phycodrys rubens Algae
Plocamium cartilagineum Algae
Alcyonium digitatum Invertebrates
Asterias rubens Invertebrates
Balanus crenatus Invertebrates
Botryllus schlosseri Invertebrates
Calliostoma zizyphinum Invertebrates
Cancer pagurus Invertebrates
Clavelina lepadiformis Invertebrates
Distomus variolosus Invertebrates
Dysidea fragilis Invertebrates
Esperiopsis fucorum Invertebrates
Gibbula cineraria Invertebrates
Halichondria panicea Invertebrates
Membranipora membranacea Invertebrates
Obelia geniculata Invertebrates
Pachymatisma johnstonia Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 IR.MIR.KR.LhypT.Ft <I>Laminaria hyperborea</I> forest, foliose red seaweeds and a diverse fauna on tide-swept upper 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 A3.2121 Laminaria hyperborea forest, foliose red seaweeds and a diverse fauna on tide-swept upper infralittoral rock same
EUNIS Habitat Classification 200308 A3.2123 Laminaria hyperborea forest, foliose red seaweeds and diverse fauna on tide-swept upper infralittoral rock same
EUNIS Habitat Classification 200202 A3.2123 Laminaria hyperborea forest, foliose red seaweeds and diverse fauna on tide-swept upper infralittoral rock same
EUNIS Habitat Classification 199910 A3.2123 Laminaria hyperborea forest, foliose red seaweeds and diverse fauna on tide-swept upper infralittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) MIR.KR.Lhyp.TFt Laminaria hyperborea forest, foliose red seaweeds and diverse fauna on tide-swept upper infralittoral rock same
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