EUNIS habitat classification 2017 > M - Marine benthic habitats > MC1 - Circalittoral rock > MC12 - Atlantic circalittoral rock > MC121 - Faunal turf communities on Atlantic circalittoral rock > MC1212 - Tubularia indivisa on tide-swept Atlantic circalittoral rock

Tubularia indivisa on tide-swept Atlantic circalittoral rock

Description (English)

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 MC1-2121 sub-unit. 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 biotope MC1-2122. 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.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MC1212
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

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 Calliostoma zizyphinum
Invertebrates Cancer pagurus
Invertebrates Esperiopsis fucorum
Invertebrates Flustra foliacea
Invertebrates Halichondria panicea
Invertebrates Myxilla incrustans
Invertebrates Nemertesia antennina
Invertebrates Pachymatisma johnstonia
Invertebrates Sagartia elegans
Invertebrates Sertularia argentea
Invertebrates Tubularia indivisa
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
Calliostoma zizyphinum Invertebrates
Cancer pagurus Invertebrates
Esperiopsis fucorum Invertebrates
Flustra foliacea Invertebrates
Halichondria panicea Invertebrates
Myxilla incrustans Invertebrates
Nemertesia antennina Invertebrates
Pachymatisma johnstonia Invertebrates
Sagartia elegans Invertebrates
Sertularia argentea Invertebrates
Tubularia indivisa Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A4.112 Tubularia indivisa on tide-swept circalittoral rock same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A4.112 Tubularia indivisa on tide-swept circalittoral rock same
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