Bryozoan turf and erect sponges on tide-swept circalittoral rock

English name: Bryozoan turf and erect sponges on tide-swept circalittoral rock

Quick facts

EUNIS habitat type code A4.131
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Description (English)

This biotope is typically found on wave-exposed circalittoral bedrock or boulders subject to tidal streams ranging from moderately strong to strong. It often has a thin layer of silt covering the seabed, and is characterised by a bryozoan/hydroid turf with erect sponges. Typical bryozoans to be found include crisiids, Alcyonidium diaphanum, Flustra foliacea, Pentapora foliacea, Bugula plumosa and Bugula flabellata, while typical hydroids include Nemertesia antennina, Nemertesia ramosa and Halecium halecinum. The soft coral Alcyonium digitatum is frequently recorded on the tops of boulders and rocky outcrops. Characteristic erect sponges include Raspailia ramosa, Stelligera stuposa and Stelligera rigida; other sponges present include Cliona celata, Dysidea fragilis, Pachymatisma johnstonia, Polymastia boletiformis, Hemimycale columella, Esperiopsis fucorum, Polymastia mamillaris and Tethya aurantium. Other species present include Caryophylia smithii, Actinothoe sphyrodeta, Corynactis viridis, Urticina felina, Balanus crenatus, Asterias rubens, Marthasterias glacialis, Henricia oculata, Echinus esculentus, Clavelina lepadiformis, Calliostoma zizyphinum and Necora puber. Three variants of this biotope have been described, but all are characterised by a bryozoan turf with erect sponges. A4.1311 is found primarily on circalittoral bedrock and is dominated by the seafan Eunicella verrucosa. Unit A4.1312 is found under slightly stronger tide-swept conditions, and is characterised particularly by the sponge D. fragilis and the anemone A. sphyrodeta. Finally unit A4.1313 is characterised by the anemone Sagartia elegans.

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 Bugula flabellata
Invertebrates Bugula plumosa
Invertebrates Calliostoma zizyphinum
Invertebrates Clavelina lepadiformis
Invertebrates Cliona celata
Invertebrates Corynactis viridis
Invertebrates Dysidea fragilis
Invertebrates Echinus esculentus
Invertebrates Esperiopsis fucorum
Invertebrates Eunicella verrucosa
Invertebrates Flustra foliacea
Invertebrates Hemimycale columella
Invertebrates Henricia oculata
Invertebrates Marthasterias glacialis
Invertebrates Necora puber
Invertebrates Nemertesia antennina
Invertebrates Nemertesia ramosa
Invertebrates Pachymatisma johnstonia
Invertebrates Polymastia boletiformis
Invertebrates Polymastia mamillaris
Invertebrates Raspailia ramosa
Invertebrates Sagartia elegans
Invertebrates Stelligera rigida
Invertebrates Stelligera stuposa
Invertebrates Tethya aurantium
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
Bugula flabellata Invertebrates
Bugula plumosa Invertebrates
Calliostoma zizyphinum Invertebrates
Clavelina lepadiformis Invertebrates
Cliona celata Invertebrates
Corynactis viridis Invertebrates
Dysidea fragilis Invertebrates
Echinus esculentus Invertebrates
Esperiopsis fucorum Invertebrates
Eunicella verrucosa Invertebrates
Flustra foliacea Invertebrates
Hemimycale columella Invertebrates
Henricia oculata Invertebrates
Marthasterias glacialis Invertebrates
Necora puber Invertebrates
Nemertesia antennina Invertebrates
Nemertesia ramosa Invertebrates
Pachymatisma johnstonia Invertebrates
Polymastia boletiformis Invertebrates
Polymastia mamillaris Invertebrates
Raspailia ramosa Invertebrates
Sagartia elegans Invertebrates
Stelligera rigida Invertebrates
Stelligera stuposa Invertebrates
Tethya aurantium Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.HCR.XFa.ByErSp Bryozoan turf and erect sponges on 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 A4.131 Bryozoan turf and erect sponges on tide-swept circalittoral rock same
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