Mytilus edulis and piddocks on eulittoral firm clay

English name: Mytilus edulis and piddocks on eulittoral firm clay

Description (English)

Clay outcrops in the mid to lower eulittoral which are bored by a variety of piddocks including Pholas dactylus, Barnea candida and Petricola pholadiformis. The surface of the clay is characterised by small clumps of the mussel Mytilus edulis, the barnacle Elminius modestus and the winkle Littorina littorea. Seaweeds are generally sparse on the clay, although small patches of the red seaweeds Mastocarpus stellatus, Halurus flosculosus and Ceramium spp. can occur, usually attached to loose-lying cobble or mussel shells. Also the green seaweeds Enteromorpha spp. and Ulva lactuca may be present. The sand mason Lanice conchilega can sometimes be present in the clay, while the shore crab Carcinus maenas is present as well. More data are required to validate this description.
Situation: This unit can usually be found beneath a M. edulis or barnacle and Littorina spp.-dominated biotope (A2.721; A2.431). It is found above a Laminaria digitata and piddocks-dominated biotope (unit A3.2113).
Temporal variation: The C. maenas population may migrate offshore during the winter season.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A1.223
Bern Convention Included in a Resolution 4 habitat type at a higher level (A1.22)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Barnea candida
Invertebrates Carcinus maenas
Invertebrates Elminius modestus
Algae Halurus flosculosus
Algae Laminaria digitata
Invertebrates Lanice conchilega
Invertebrates Littorina littorea
Algae Mastocarpus stellatus
Invertebrates Mytilus edulis
Invertebrates Petricola pholadiformis
Invertebrates Pholas dactylus
Algae Ulva lactuca
Species scientific name English common name Species group
Barnea candida Invertebrates
Carcinus maenas Invertebrates
Elminius modestus Invertebrates
Halurus flosculosus Algae
Laminaria digitata Algae
Lanice conchilega Invertebrates
Littorina littorea Invertebrates
Mastocarpus stellatus Algae
Mytilus edulis Invertebrates
Petricola pholadiformis Invertebrates
Pholas dactylus Invertebrates
Ulva lactuca Algae

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.MLR.MusF.MytPid <I>Mytilus edulis</I> and piddocks on eulittoral firm clay 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 A1.223 Mytilus edulis and piddocks on eulittoral firm clay same
EUNIS Habitat Classification 200308 A1.253 Mytilus edulis beds and piddocks on eulittoral firm clay same
EUNIS Habitat Classification 200202 A1.253 Mytilus edulis beds and piddocks on eulittoral firm clay same
EUNIS Habitat Classification 199910 A1.243 Mytilus edulis beds and piddocks on eulittoral firm clay same
MNCR BioMar 97.06 (Britain & Ireland) MLR.MF.MytPid Mytilus edulis beds and piddocks on eulittoral firm clay same
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