Cushion sponges, hydroids and ascidians on turbid tide-swept sheltered circalittoral rock

English name: Cushion sponges, hydroids and ascidians on turbid tide-swept sheltered circalittoral rock

Quick facts

EUNIS habitat type code A4.2511
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Description (English)

This sub-biotope typically occurs in a mixture of turbid, full and variable salinity water, on wave-sheltered and moderately exposed bedrock or boulders. Tidal streams are typically moderately strong but may vary considerably. This sub-biotope occurs in relatively shallow water (typically 5m to 11m water depth) and is dominated by cushion sponges, hydroids and ascidians. On the silty, rocky substrata, large growths of sponge are usually associated with this biotope (Suberites ficus, Hymeniacidon perleve, Cliona celata, Halichondria panicea, Raspailia ramosa). The tasselled form of Esperiopsis fucorum is also notably present. Other epifauna present includes silty hydroids such as Nemertesia antennina, Nemertesia ramosa, Plumularia setacea, Hydrallmania falcata and Halecium halecinum. Individual colonies of dead mans fingers Alcyonium digitatum and plumose anemones Metridium senile may be seen attached to the tops of boulders and ridges. At some sites, whole sides of rocks may be colonised by the anemones Sagartia elegans, Sagartia troglodytes and Actinothoe sphyrodeta. Within crevices in the rocky substratum and at the base of boulders Urticina felina and Cereus pedunculatus may be found. Ascidians such as Clavelina lepadiformis, Morchellium argus, Dendrodoa grossularia, Diplosoma listerianum and Distomus variolosus may all be observed. Other ubiquitous species which may be recorded include Polydora, terebellid worms, Balanus crenatus, Alcyonidium diaphanum and Asterias rubens.

Source: EUNIS habitat classification

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 Cereus pedunculatus
Invertebrates Clavelina lepadiformis
Invertebrates Cliona celata
Invertebrates Dendrodoa grossularia
Invertebrates Diplosoma listerianum
Invertebrates Distomus variolosus
Invertebrates Esperiopsis fucorum
Invertebrates Halichondria panicea
Invertebrates Hydrallmania falcata
Invertebrates Metridium senile
Invertebrates Nemertesia antennina
Invertebrates Nemertesia ramosa
Invertebrates Plumularia setacea
Invertebrates Raspailia ramosa
Invertebrates Sagartia elegans
Invertebrates Sagartia troglodytes
Invertebrates Suberites ficus
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
Cereus pedunculatus Invertebrates
Clavelina lepadiformis Invertebrates
Cliona celata Invertebrates
Dendrodoa grossularia Invertebrates
Diplosoma listerianum Invertebrates
Distomus variolosus Invertebrates
Esperiopsis fucorum Invertebrates
Halichondria panicea Invertebrates
Hydrallmania falcata Invertebrates
Metridium senile Invertebrates
Nemertesia antennina Invertebrates
Nemertesia ramosa Invertebrates
Plumularia setacea Invertebrates
Raspailia ramosa Invertebrates
Sagartia elegans Invertebrates
Sagartia troglodytes Invertebrates
Suberites ficus Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.MCR.CFaVS.CuSpH.As Cushion sponges, hydroids and ascidians on turbid tide-swept sheltered 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 A4.2511 Cushion sponges, hydroids and ascidians on turbid tide-swept sheltered circalittoral rock same
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