EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A4 - Circalittoral rock and other hard substrata > A4.2 - Atlantic and Mediterranean moderate energy circalittoral rock > A4.24 - Mussel beds on circalittoral rock > A4.241 - Mytilus edulis beds with hydroids and ascidians on tide-swept exposed to moderately wave-exposed circalittoral rock

Mytilus edulis beds with hydroids and ascidians on tide-swept exposed to moderately wave-exposed circalittoral rock

English name: Mytilus edulis beds with hydroids and ascidians on tide-swept exposed to moderately wave-exposed circalittoral rock

Description (English)

This biotope typically occurs on the upper faces of tide-swept circalittoral bedrock, boulders and mixed substrata exposed to varying amounts of wave action. The mussel Mytilus edulis forms dense beds, to the exclusion of other species. The starfish Asterias rubens is frequently recorded, and it predates heavily on the mussels. Occasionally, the anemone Urticina felina may be seen within crevices in the rock or on gravel patches. Crabs such as Necora puber and Carcinus maenas may be seen on the rock or mussels whilst fauna observed in crevices typically consists of the lobster Homarus gammarus and the crab Cancer pagurus. The anemone Sargatia elegans can be seen attached to bedrock and cobbles, whereas the barnacle Balanus crenatus may be seen attached to the mussels themselves.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A4.241
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 Asterias rubens
Invertebrates Balanus crenatus
Invertebrates Cancer pagurus
Invertebrates Carcinus maenas
Invertebrates Homarus gammarus
Invertebrates Mytilus edulis
Invertebrates Necora puber
Invertebrates Urticina felina
Species scientific name English common name Species group
Asterias rubens Invertebrates
Balanus crenatus Invertebrates
Cancer pagurus Invertebrates
Carcinus maenas Invertebrates
Homarus gammarus Invertebrates
Mytilus edulis Invertebrates
Necora puber Invertebrates
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.MCR.CMus.CMyt <I>Mytilus edulis</I> beds with hydroids and ascidians on tide-swept exposed to moderately 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 A4.241 Mytilus edulis beds with hydroids and ascidians on tide-swept exposed to moderately wave-exposed circalittoral rock same
EUNIS Habitat Classification 200308 A3.641 Mytilus edulis beds with hydroids and ascidians on tide-swept moderately exposed circalittoral rock same
EUNIS Habitat Classification 200202 A3.641 Mytilus edulis beds with hydroids and ascidians on tide-swept moderately exposed circalittoral rock same
EUNIS Habitat Classification 199910 A3.641 Mytilus edulis beds with hydroids and ascidians on tide-swept moderately exposed circalittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) MCR.M.MytHAs Mytilus edulis beds with hydroids and ascidians on tide-swept moderately exposed circalittoral rock same
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