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Concept: [Tubularia indivisa] on tide-swept circalittoral rock in the eunishabitats vocabulary

Concept URI http://eunis.eea.europa.eu/eunishabitats/A4.112
Preferred label [Tubularia indivisa] on tide-swept circalittoral rock
Definition This biotope is typically found on the vertical and upper faces of strongly tide-swept, wave-exposed circalittoral bedrock and boulders. It is characterised by a dense carpet of the robust hydroid [Tubularia indivisa]. The barnacle [Balanus crenatus], where present, is recorded as common. The accompanying species in the community are determined by tidal stream strength. On the more sheltered sides of headlands, where tidal streams are accelerated, sponges such as [Pachymatisma johnstonia], [Esperiopsis fucorum], [Myxilla incrustans] and [Halichondria panicea] proliferate forming the CTub.CuSp sub-biotope. There may also be a scattered bryozoan turf, formed by criisid bryozoans. However, where tidal streams are slightly reduced, but on more wave-exposed coasts, anthozoans such as [Alcyonium digitatum] become more prominent forming the CTub.Adig biotope. Other species recorded in this biotope include the anemones [Sagartia elegans], [Actinothoe sphyrodeta], [Corynactis virdis] and [Urticina felina]. There may be scattered clumps of hydroids such as [Sertularia argentea] and [Nemertesia antennina]. Where `relative shelter' is afforded by the topography of the seabed, the bryozoans [Flustra foliacea], [Alcyonidium diaphanum] and the crab [Cancer pagurus] may be found. More ubiqutous species such as [Asterias rubens] and [Calliostoma zizyphinum] may also be present.
Notation A4.112
Status Valid
Status Modified 2014-01-31
Accepted Date 2014-01-31
Not Accepted Date
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