EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A4 - Circalittoral rock and other hard substrata > A4.1 - Atlantic and Mediterranean high energy circalittoral rock > A4.13 - Mixed faunal turf communities on circalittoral rock > A4.131 - Bryozoan turf and erect sponges on tide-swept circalittoral rock > A4.1312 - Mixed turf of bryozoans and erect sponges with Dysidia fragilis and Actinothoe sphyrodeta on tide-swept wave-exposed circalittoral rock

Mixed turf of bryozoans and erect sponges with Dysidia fragilis and Actinothoe sphyrodeta on tide-swept wave-exposed circalittoral rock

English name: Mixed turf of bryozoans and erect sponges with Dysidia fragilis and Actinothoe sphyrodeta on tide-swept wave-exposed circalittoral rock

Quick facts

EUNIS habitat type code A4.1312
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Description (English)

This variant typically occurs on exposed and moderately wave-exposed bedrock and boulders subject to a variety of tidal regimes (from strong through to weak). It is found mainly in the 10-20m depth range and does not usually occur deeper than 30 m. It therefore often straddles the upper circalittoral and lower infralittoral. It often has a light covering of silt and sand may be in the vicinity. Sponges form a dominant part of this variant, although cover usually appears patchy, with no single species dominating. Species present include Dysidea fragilis, Pachymatisma johnstonia, Esperiopsis fucorum, Hemimycale columella, Cliona celata, Stelligera rigida, Polymastia boletiformis, Stelligera stuposa, Raspailia ramosa, Tethya aurantium, Polymastia mamillaris and Axinella dissimilis. Tufts of large hydroids such as Nemertesia antennina, frequently recorded on the tops of outcrops and boulders, stand out more clearly than the understorey of finer hydroid and bryozoan turf such as Aglaophenia pluma, Bugula flabellata, Bugula plumosa, crisiids, Cellaria sinuosa and Bugula turbinata. Other bryozoans such as Alcyonidium diaphanum and Flustra foliacea are also frequently recorded. Other more widespread species present include Asterias rubens, Actinothoe sphyrodeta, Balanus crenatus, Caryophyllia smithii, Corynactis viridis, Necora puber and Clavelina lepadiformis. This variant has been recorded off the south east coast of Ireland, the welsh coast and Lundy Island.
Situation: This biotope is typically found on exposed coasts, with exposed kelp forest in the infralittoral zone, characterised by species such as Laminaria hyperborea and Saccorhiza polyschides. The A4.1312 variant is usually found below A4.1311, with similar geographic range.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Laminaria hyperborea
Algae Saccorhiza polyschides
Invertebrates Actinothoe sphyrodeta
Invertebrates Aglaophenia pluma
Invertebrates Alcyonidium diaphanum
Invertebrates Asterias rubens
Invertebrates Axinella dissimilis
Invertebrates Balanus crenatus
Invertebrates Bugula flabellata
Invertebrates Bugula plumosa
Invertebrates Bugula turbinata
Invertebrates Caryophyllia smithii
Invertebrates Cellaria sinuosa
Invertebrates Clavelina lepadiformis
Invertebrates Cliona celata
Invertebrates Corynactis viridis
Invertebrates Dysidea fragilis
Invertebrates Esperiopsis fucorum
Invertebrates Flustra foliacea
Invertebrates Hemimycale columella
Invertebrates Necora puber
Invertebrates Nemertesia antennina
Invertebrates Pachymatisma johnstonia
Invertebrates Polymastia boletiformis
Invertebrates Polymastia mamillaris
Invertebrates Raspailia ramosa
Invertebrates Stelligera rigida
Invertebrates Stelligera stuposa
Invertebrates Tethya aurantium
Species scientific name English common name Species group
Laminaria hyperborea Algae
Saccorhiza polyschides Algae
Actinothoe sphyrodeta Invertebrates
Aglaophenia pluma Invertebrates
Alcyonidium diaphanum Invertebrates
Asterias rubens Invertebrates
Axinella dissimilis Invertebrates
Balanus crenatus Invertebrates
Bugula flabellata Invertebrates
Bugula plumosa Invertebrates
Bugula turbinata Invertebrates
Caryophyllia smithii Invertebrates
Cellaria sinuosa Invertebrates
Clavelina lepadiformis Invertebrates
Cliona celata Invertebrates
Corynactis viridis Invertebrates
Dysidea fragilis Invertebrates
Esperiopsis fucorum Invertebrates
Flustra foliacea Invertebrates
Hemimycale columella Invertebrates
Necora puber Invertebrates
Nemertesia antennina Invertebrates
Pachymatisma johnstonia Invertebrates
Polymastia boletiformis Invertebrates
Polymastia mamillaris Invertebrates
Raspailia ramosa Invertebrates
Stelligera rigida Invertebrates
Stelligera stuposa Invertebrates
Tethya aurantium Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.HCR.XFa.ByErSp.DysAct Mixed turf of bryozoans and erect sponges with <I>Dysidia fragilis</I> and <I>Actinothoe sphyrodeta</I> on tide-swept wave-exposed 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 A4.1312 Mixed turf of bryozoans and erect sponges with Dysidia fragilis and Actinothoe sphyrodeta on tide-swept wave-exposed circalittoral rock same
EUNIS Habitat Classification 200308 A3.613 Mixed turf of bryozoans and erect sponges with Dysidia fragilis and Actinothoe sphyrodeta on tide-swept, wave-exposed circalittoral rock same
EUNIS Habitat Classification 200202 A3.613 Cushion sponges (Polymastia boletiformis, Tethya), stalked sponges, Nemertesia spp. and Pentapora foliacea on moderately exposed circalittoral rock same
EUNIS Habitat Classification 199910 A3.613 Cushion sponges (Polymastia boletiformis, Tethya), stalked sponges, Nemertesia spp. and Pentapora foliacea on moderately exposed circalittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) MCR.XFa.ErSPbolSH Cushion sponges (Polymastia boletiformis, Tethya), stalked sponges, Nemertesia spp. and Pentapora foliacea on moderately exposed circalittoral rock same
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