Mytilus edulis beds on littoral sand

English name: Mussel beds on littoral sand

Quick facts

EUNIS habitat type code A2.7212
Bern Convention Included in a Resolution 4 habitat type at a higher level (A2.72)

Description (English)

This sub-biotope occurs on mid to lower shore sand and muddy sand. Mussels Mytilus edulis grow attached to shell debris and live cockles Cerastoderma edule, forming patches of mussels on consolidated shell material, and often growing into extensive beds. The mussel valves are usually encrusted with barnacles such as Elminius modestus and Semibalanus balanoides, and the mussel bed provides a habitat for a range of species including Littorina littorea. The sediment infaunal community is usually rich and very similar to that of cockle beds (A2.242), including cockles Cerastoderma edule, the baltic tellin Macoma balthica, and a range of burrowing crustaceans and polychaetes typical for A2.242. Further species may be present are the sand mason Lanice conchilega, the sand gaper Mya arenaria, the peppery furrow shell Scrobicularia plana, Nephtys spp., and the ragworm Hediste diversicolor. Scattered fronds of eelgrass Zostera noltii may occur.
Situation: This biotope often occurs in large sandy estuaries, or on enclosed shores, alongside other sand and muddy sand biotopes, most notably unit A2.242. It is possible that Lanice beds (unit A2.245) occur lower down on the shore.
Temporal variation: Where this sub-biotope occurs in very sheltered conditions on muddy sand, it could change to A2.7213 over time as pseudofaeces build up forming a layer of mud. This cannot happen where wave action or tidal streams wash away pseudofaeces and prevent a build up. In areas where mussel spat ("mussel crumble") settles on the surface shell layer of cockle beds, the mussel cover may be ephemeral, as is the case in the Burry Inlet (south Wales, UK).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Cerastoderma edule
Invertebrates Elminius modestus
Invertebrates Lanice conchilega
Invertebrates Littorina littorea
Invertebrates Macoma balthica
Invertebrates Mya arenaria
Invertebrates Mytilus edulis
Invertebrates Scrobicularia plana
Invertebrates Semibalanus balanoides
Flowering Plants Zostera noltii
Species scientific name English common name Species group
Cerastoderma edule Invertebrates
Elminius modestus Invertebrates
Lanice conchilega Invertebrates
Littorina littorea Invertebrates
Macoma balthica Invertebrates
Mya arenaria Invertebrates
Mytilus edulis Invertebrates
Scrobicularia plana Invertebrates
Semibalanus balanoides Invertebrates
Zostera noltii Flowering Plants

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LS.LBR.LMus.Myt.Sa <I>Mytilus edulis</I> beds on littoral sand source
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 A2.7212 Mytilus edulis beds on littoral sand same
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