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Concept: Mixed turf of bryozoans and erect sponges with [Dysidia fragilis] and [Actinothoe sphyrodeta] on tide-swept wave-exposed circalittoral rock in the eunishabitats vocabulary

Concept URI http://eunis.eea.europa.eu/eunishabitats/A4.1312
Preferred label Mixed turf of bryozoans and erect sponges with [Dysidia fragilis] and [Actinothoe sphyrodeta] on tide-swept wave-exposed circalittoral rock
Definition 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 ByErSp.DysAct variant is usually found below ByErSp.Eun, with similar geographic range.
Notation A4.1312
Status Valid
Status Modified 2014-01-31
Accepted Date 2014-01-31
Not Accepted Date
Has broader
Has exact match