EUNIS habitat classification 2012 > A - Marine habitats > A1 - Littoral rock and other hard substrata > A1.2 - Moderate energy littoral rock > A1.22 - Mussels and fucoids on moderately exposed shores

Mussels and fucoids on moderately exposed shores

English name: Mussels and fucoids on moderately exposed shores

Quick facts

EUNIS habitat type code A1.22
Bern Convention Resolution 4 habitat type (used for designation of Emerald sites)
Relation to Annex I habitat types (EU Habitats Directive)

Description (English)

Mid and lower eulittoral exposed to moderately exposed bedrock, often with nearby sediment, may be densely covered by large individuals of the mussel Mytilus edulis. Three biotopes have been described: In the mid eulittoral, the mussels may form a band or large patches with scattered bladder wrack Fucus vesiculosus (A1.221). In the lower eulittoral a range of red seaweeds including Mastocarpus stellatus and Palmaria palmata occur amongst the mussels (in higher abundance than the mid eulittoral) (A1.222). Clay outcrops in the mid to lower eulittoral may be bored by a variety of piddocks including Pholas dactylus, Barnea candida and Petricola pholadiformis, while the surface is characterised by small clumps of the mussel M. edulis, the barnacle Elminius modestus and the winkle Littorina littorea (A1.223). Ephemeral green seaweeds such as Enteromorpha intestinalis and Ulva lactuca commonly occur on the shells of the mussels. Barnacles are common on both the mussel valves and on patches of bare rock, where the limpet Patella vulgata is found as well, often at high abundance. The whelk Nucella lapillus and a range of littorinids also occur within the mussel bed. A dense M. edulis community may be found on more sheltered coasts on mixed substrata (A2.721).
Situation: Above this habitat type is a M. edulis and S. balanoides dominated zone or a F. vesiculosus dominated biotope (A1.213). In the lower eulittoral zone below is a zone dominated by the wrack Fucus serratus, M. edulis and a variety of red seaweeds (A1.21) while kelp dominate the sublittoral fringe.

Source:
EUNIS habitat classification
Interpretation Manual of the habitats targeted by Resolution No. 4

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.MLR.MusF Mussels and fucoids on moderately exposed shores source
Palaearctic Habitat Classification 200112 11.254 Mussel beds wider
CORINE Land Cover 4.2.3. Intertidal flats n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A1.22 Mytilus edulis and fucoids on moderately exposed shores same
EUNIS Habitat Classification 200308 A1.25 Mussels and fucoids on moderate energy shores same
EUNIS Habitat Classification 200202 A1.25 Mussels and fucoids on moderately exposed littoral rock same
EUNIS Habitat Classification 199910 A1.24 Mussels and fucoids on moderately exposed littoral rock same
EUNIS Habitat Classification 199811 A1.24 Mussel beds and fucoids on moderately exposed rock same
EUNIS Habitat Classification 199712 A1.34 Mussel beds on moderately exposed rock same
Palaearctic Habitat Classification 199905 11.254 Part of Mussel beds narrower
Palaearctic Habitat Classification 1997 11.254 Part of Mussel beds narrower
Palaearctic Habitat Classification 1996 11.254   narrower
Palaearctic Habitat Classification 1993 11.254   narrower
CORINE Biotopes Classification 1991 11.254   narrower
MNCR BioMar 97.06 (Britain & Ireland) MLR.MF Mytilus (mussels) and fucoids (moderately exposed shores) same
MNCR BioMar 96.7 (Britain & Ireland) SLR.MytX   same
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