Mixed turf of bryozoans and erect sponges with Sagartia elegans on tide-swept ciraclittoral rock

English name: Mixed turf of bryozoans and erect sponges with Sagartia elegans on tide-swept ciraclittoral rock

Quick facts

EUNIS habitat type code A4.1313
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Description (English)

This variant is typically found on wave-exposed circalittoral bedrock and boulders, on steep slopes and upper faces in moderate tidal streams. This species-rich biotope is characterised by a dense sponge, hydroid and bryozoan turf and frequent Alcyonium digitatum. There are frequently large growths of Cliona celata and Pachymatisma johnstonia. Other species present in this diverse sponge community include Polymastia boletiformis, Haliclona viscosa, Polymastia mamilliaris, Scypha ciliata, Hemimycale columella and Dysidea fragilis. Axinellid sponges such as Stelligera stuposa and Raspailia ramosa may be present in low abundance, and are usually more abundant in deeper water. A dense hydroid turf forms a significant part of this biotope, with tufts of large hydroids such as Nemertesia antennina and Nemertesia ramosa frequently recorded. Other hydroid turf component species include Halecium halecinum, Aglaophenia tubulifera and Abietinaria abietina. Anemones are also well represented, with species such as Urticina felina, Sagartia elegans and Metridium senile recorded. The cup coral Caryophyllia smithii and the anemone Corynactis viridis are also frequently seen. The bryozoan turf is composed predominantly of Alcyonidium diaphanum and Flustra foliacea, whilst crustose species such as Parasmittina trispinosa contribute to a lesser extent. The delicate Bugula plumosa may also be present. There is a significant echinoderm component in this biotope. Species such as the starfish Asterias rubens, Henricia oculata, Marthasterias glacialis and Luidia ciliaris, the sea urchin Echinus esculentus and the crinoid Antedon bifida are all regularly recorded. Other species which may be observed include the top shell Calliostoma zizyphinium, the colonial ascidian Clavelina lepadiformis and the barnacle Balanus crenatus. The crab Cancer pagurus is typically found under boulders. This variant has been recorded from from various sites including Pembrokeshire, the Calf of Man and the west coast of Ireland.
Situation: Dense kelp forests containing L. hyperborea and S. polyschides are typically found above A4.1313.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Abietinaria abietina
Invertebrates Aglaophenia tubulifera
Invertebrates Alcyonidium diaphanum
Invertebrates Alcyonium digitatum
Invertebrates Antedon bifida
Invertebrates Asterias rubens
Invertebrates Balanus crenatus
Invertebrates Bugula plumosa
Invertebrates Cancer pagurus
Invertebrates Caryophyllia smithii
Invertebrates Clavelina lepadiformis
Invertebrates Cliona celata
Invertebrates Corynactis viridis
Invertebrates Dysidea fragilis
Invertebrates Echinus esculentus
Invertebrates Flustra foliacea
Invertebrates Haliclona viscosa
Invertebrates Hemimycale columella
Invertebrates Henricia oculata
Invertebrates Luidia ciliaris
Invertebrates Marthasterias glacialis
Invertebrates Metridium senile
Invertebrates Nemertesia antennina
Invertebrates Nemertesia ramosa
Invertebrates Pachymatisma johnstonia
Invertebrates Parasmittina trispinosa
Invertebrates Polymastia boletiformis
Invertebrates Raspailia ramosa
Invertebrates Sagartia elegans
Invertebrates Stelligera stuposa
Invertebrates Urticina felina
Species scientific name English common name Species group
Abietinaria abietina Invertebrates
Aglaophenia tubulifera Invertebrates
Alcyonidium diaphanum Invertebrates
Alcyonium digitatum Invertebrates
Antedon bifida Invertebrates
Asterias rubens Invertebrates
Balanus crenatus Invertebrates
Bugula plumosa Invertebrates
Cancer pagurus Invertebrates
Caryophyllia smithii Invertebrates
Clavelina lepadiformis Invertebrates
Cliona celata Invertebrates
Corynactis viridis Invertebrates
Dysidea fragilis Invertebrates
Echinus esculentus Invertebrates
Flustra foliacea Invertebrates
Haliclona viscosa Invertebrates
Hemimycale columella Invertebrates
Henricia oculata Invertebrates
Luidia ciliaris Invertebrates
Marthasterias glacialis Invertebrates
Metridium senile Invertebrates
Nemertesia antennina Invertebrates
Nemertesia ramosa Invertebrates
Pachymatisma johnstonia Invertebrates
Parasmittina trispinosa Invertebrates
Polymastia boletiformis Invertebrates
Raspailia ramosa Invertebrates
Sagartia elegans Invertebrates
Stelligera stuposa Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.HCR.XFa.ByErSp.Sag Mixed turf of bryozoans and erect sponges with <I>Sagartia elegans</I> on tide-swept ciraclittoral 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 A4.1313 Mixed turf of bryozoans and erect sponges with Sagartia elegans on tide-swept ciraclittoral rock same
EUNIS Habitat Classification 200308 A3.522 Mixed turf of bryozoans and erect sponges with Sagartia elegans on tide-swept ciraclittoral rock same
EUNIS Habitat Classification 200202 A3.522 Alcyonium digitatum with massive sponges (Cliona celata and Pachymatisma johnstonia), and Nemertesia antennina on moderately tide-swept exposed circalittoral rock same
EUNIS Habitat Classification 199910 A3.522 Alcyonium digitatum with massive sponges (Cliona celata and Pachymatisma johnstonia), and Nemertesia antennina on moderately tide-swept exposed circalittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) ECR.Alc.AlcMaS Alcyonium digitatum with massive sponges (Cliona celata and Pachymatisma johnstonia), and Nemertesia antennina on moderately tide-swept exposed circalittoral rock same
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