EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A4 - Circalittoral rock and other hard substrata > A4.7 - Features of circalittoral rock > A4.72 - Circalittoral fouling faunal communities > A4.721 - Alcyonium digitatum and Metridium senile on moderately wave-exposed circalittoral steel wrecks

Alcyonium digitatum and Metridium senile on moderately wave-exposed circalittoral steel wrecks

English name: Alcyonium digitatum and Metridium senile on moderately wave-exposed circalittoral steel wrecks

Description (English)

This biotope is found on moderately wave-exposed circalittoral steel wrecks that are subject to moderately strong to weak tidal streams. The vertical and upward facing sides of the wreck stand proud of the seabed, and may be colonised by dense aggregations of Alcyonium digitatum, Metridium senile and Actinothoe sphyrodeta. Caryophyllia smithii and Corynactis viridis are also recorded with varying abundance. A mixed faunal turf may also be present on the vertical sides, with Nemertesia antennina, Flustra foliacea and Bugula plumosa. Where tidal stream strength is elevated, for example if the wreck is situated in a straight or sound, the hydroid Tubularia indivisa may prevail. Crustaceans such as the crabs Necora puber, Maja squinado and Cancer pagurus, the lobster Homarus gammarus and barnacles are all recorded. The top shell Calliostoma zizyphinum is also recorded.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A4.721
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Actinothoe sphyrodeta
Invertebrates Alcyonium digitatum
Invertebrates Bugula plumosa
Invertebrates Calliostoma zizyphinum
Invertebrates Cancer pagurus
Invertebrates Caryophyllia smithii
Invertebrates Corynactis viridis
Invertebrates Flustra foliacea
Invertebrates Homarus gammarus
Invertebrates Maja squinado
Invertebrates Metridium senile
Invertebrates Necora puber
Invertebrates Nemertesia antennina
Invertebrates Tubularia indivisa
Species scientific name English common name Species group
Actinothoe sphyrodeta Invertebrates
Alcyonium digitatum Invertebrates
Bugula plumosa Invertebrates
Calliostoma zizyphinum Invertebrates
Cancer pagurus Invertebrates
Caryophyllia smithii Invertebrates
Corynactis viridis Invertebrates
Flustra foliacea Invertebrates
Homarus gammarus Invertebrates
Maja squinado Invertebrates
Metridium senile Invertebrates
Necora puber Invertebrates
Nemertesia antennina Invertebrates
Tubularia indivisa Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.FCR.FouFa.AdigMsen <I>Alcyonium digitatum</I> and <I>Metridium senile</I> on moderately wave-exposed circalittoral steel wrecks 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 A4.721 Alcyonium digitatum and Metridium senile on moderately wave-exposed circalittoral steel wrecks same
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