Alcyonium digitatum with dense Tubularia indivisa and anemones on strongly tide-swept circalittoral rock

English name: Alcyonium digitatum with dense Tubularia indivisa and anemones on strongly tide-swept circalittoral rock

Description (English)

This variant is typically found on exposed circalittoral bedrock and boulders in sounds, narrows and around tide-swept promontories in accelerated tidal streams. It is dominated by aggregations of dead man's fingers Alcyonium digitatum, and dense clumps or continuous cover of the robust hydroid Tubularia indivisa, particularly on prominent ledges and ridges. Anemones such as Sagartia elegans, Urticina felina, Metridium senile, Actinothoe sphyrodeta and Corynactis virdis form a prominent component of the community. Occasionally, massive sponges such as Pachymatisma johnstonia and Esperiopsis fucorum may be present. Encrusting species such as the polychaete Pomatoceros triqueter and the barnacle Balanus crenatus may be dotted around the rocks, and the top shell Calliostoma zizyphinum may also be observed. Clumps of the bryozoan Flustra foliacea are occasionally seen. The starfish Asterias rubens may be seen amongst a patchy turf of Crisia denticulata and the bryozoan Alcyonidium diaphanum. This variant may also be found on tideswept wrecks and other artificial sustratum.
Situation: Above this biotope, it is usual to find well-developed kelp forest in the upper infralittoral, dominated by Laminaria hyperborea (unit A3.115). In the lower infralittoral, it is usual to find a tide-swept turf of hydroids and red algae.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A4.1122
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Actinothoe sphyrodeta
Invertebrates Alcyonidium diaphanum
Invertebrates Alcyonium digitatum
Invertebrates Asterias rubens
Invertebrates Balanus crenatus
Invertebrates Calliostoma zizyphinum
Invertebrates Crisia denticulata
Invertebrates Esperiopsis fucorum
Invertebrates Flustra foliacea
Algae Laminaria hyperborea
Invertebrates Metridium senile
Invertebrates Pachymatisma johnstonia
Invertebrates Pomatoceros triqueter
Invertebrates Sagartia elegans
Invertebrates Tubularia indivisa
Invertebrates Urticina felina
Species scientific name English common name Species group
Actinothoe sphyrodeta Invertebrates
Alcyonidium diaphanum Invertebrates
Alcyonium digitatum Invertebrates
Asterias rubens Invertebrates
Balanus crenatus Invertebrates
Calliostoma zizyphinum Invertebrates
Crisia denticulata Invertebrates
Esperiopsis fucorum Invertebrates
Flustra foliacea Invertebrates
Laminaria hyperborea Algae
Metridium senile Invertebrates
Pachymatisma johnstonia Invertebrates
Pomatoceros triqueter Invertebrates
Sagartia elegans Invertebrates
Tubularia indivisa Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.HCR.FaT.CTub.Adig <I>Alcyonium digitatum</I> with dense <I>Tubularia indivisa</I> and anemones on strongly tide-swept circalittoral 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 A4.1122 Alcyonium digitatum with dense Tubularia indivisa and anemones on strongly tide-swept circalittoral rock same
EUNIS Habitat Classification 200308 A3.533 Balanus crenatus, Halichondria panicea and Alcyonidium diaphanum on extremely tide-swept sheltered circalittoral rock narrower
EUNIS Habitat Classification 200308 A3.521 Alcyonium digitatum with dense Tubularia indivisa and anemones on strongly tide-swept circalittoral rock same
EUNIS Habitat Classification 200202 A3.533 Balanus crenatus, Halichondria panicea and Alcyonidium diaphanum on extremely tide-swept sheltered circalittoral rock narrower
EUNIS Habitat Classification 200202 A3.521 Alcyonium digitatum with dense Tubularia indivisa and anemones on strongly tide-swept circalittoral rock narrower
EUNIS Habitat Classification 199910 A3.521 Alcyonium digitatum with dense Tubularia indivisa and anemones on strongly tide-swept circalittoral rock narrower
EUNIS Habitat Classification 199910 A3.533 Balanus crenatus, Halichondria panicea and Alcyonidium diaphanum on extremely tide-swept sheltered circalittoral rock narrower
MNCR BioMar 97.06 (Britain & Ireland) ECR.Alc.AlcTub Alcyonium digitatum with dense Tubularia indivisa and anemones on strongly tide-swept circalittoral rock narrower
MNCR BioMar 97.06 (Britain & Ireland) ECR.BS.BalHpan Balanus crenatus, Halichondria panicea and Alcyonidium diaphanum on extremely tide-swept sheltered circalittoral rock narrower
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