Cerastoderma edule and polychaetes in littoral muddy sand
Quick facts
EUNIS habitat type | code A2.242 |
---|---|
Bern Convention | Included in a Resolution 4 habitat type at a higher level (A2.2) |
Description (English)
Extensive clean fine sand or muddy sand shores with abundant cockles Cerastoderma edule. The community consists of the polychaetes Eteone longa, Scoloplos armiger, Pygospio elegans, Spio filicornis and Capitella capitata, the crustaceans Bathyporeia sarsi, Bodotria arenosa arenosa and Crangon crangon, the spire shell Hydrobia ulvae, as well as the cockle C. edule and the baltic tellin Macoma balthica. This biotope carries commercially viable stocks of C. edule, and it is therefore possible to find areas of this habitat where the infauna may have been changed through recent cockle dredging. Cockle dredging can result in a reduced bivalve abundance and reduced densities of some polychaete species, including P. elegans (Moore, 1991). At the outer edges of large flats, there may be a zone between the cockle beds and more exposed sands, where there are fewer cockles and B. sarsi is the commoner species.
Situation: The community is found mainly on the mid and lower shore where the sediment is water-saturated most of the time. Where it occurs in muddy sand, this unit has broad transition areas with units A2.241 and the A2.31, and where it occurs on clean sand shores, it may have broad transition areas with A2.7212. Higher on the shore, adjacent to this biotope, BatCare is found, with fewer polychaete and bivalve species due to the drier sediment found on the upper shore.
Temporal variation: A layer of mud with dense spionid polychaetes may build up on cockle beds in sheltered areas, creating a cohesive muddy layer 10-15 cm thick overlying the whole area. This may break up leaving a series of pits and patches with miniature cliffs, giving it an appearance similar to a stony shore when seen from a distance. It should be noted that where it occurs, Hydrobia ulvae tends to move a lot and may be highly variable in abundance.
Source: EUNIS habitat classification
Vegetation types
Relation to vegetation types (syntaxa)
Not availableSpecies mentioned in habitat description
Species scientific name | English common name | Species group |
---|---|---|
Bathyporeia sarsi | Invertebrates | |
Cerastoderma edule | Invertebrates | |
Crangon crangon | Invertebrates | |
Macoma balthica | Invertebrates | |
Scoloplos armiger | Invertebrates |
Other classifications
Classification | Code | Habitat type name | Relationship type |
---|---|---|---|
Marine Habitat Classification Britain/Ireland 0405 | LS.LSa.MuSa.CerPo | <I>Cerastoderma edule</I> and polychaetes in littoral muddy sand | source |
CORINE Land Cover | 4.2.3. | Intertidal flats | n/a |
History
Classification | Code | Habitat type name | Relationship type |
---|---|---|---|
EUNIS Habitat Classification 200410 | A2.242 | Cerastoderma edule and polychaetes in littoral muddy sand | same |
EUNIS Habitat Classification 200308 | A2.252 | Cerastoderma edule and polychaetes in littoral muddy sand | same |
EUNIS Habitat Classification 200202 | A2.252 | Polychaetes and Cerastoderma edule in fine sand and muddy sand shores | same |
EUNIS Habitat Classification 199910 | A2.222 | Polychaetes and Cerastoderma edule in fine sand and muddy sand shores | same |
MNCR BioMar 97.06 (Britain & Ireland) | LMS.MS.PCer | Polychaetes and Cerastoderma edule in fine sand and muddy sand shores | same |