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LR.MLR.MusF.MytPid
Mytilus edulis and piddocks on eulittoral firm clay

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Habitat (physical) description

Distribution

 Salinity: Full (30-35 ppt) 
 Wave exposure: Exposed, Moderately exposed 
 Tidal streams:  
 Substratum: Clay; cobbles 
 Zone: Eulittoral 
 Depth Band: Lower shore 
 Other Features:  

Download comparative physical and biological data. The comparative tables enable a rapid comparison of the species composition and principal physical characteristics between a given set of biotopes.

Previous code

This biotope occurred in previous versions of the classification as:
MLR.MytPid - Version: 97.06
MLR.Myt.Pid - Version: 96.7
LRK.PID.CLY - Version: 6.95

Distribution of habitat LR.MLR.MusF.MytPid  Mytilus edulis and piddocks on eulittoral firm clay
Distribution of habitat LR.MLR.MusF.MytPid Mytilus edulis and piddocks on eulittoral firm clay, based on records on the UK Marine Recorder database and EUSeaMap. Red dots represent records on which the biotope is based. Blue dots show other certain records, black dots show records tentatively assigned to this biotope. Yellow areas show level 2 and 3 sublittoral and deep-sea habitats prediced by EUSeaMap within UK waters.

Biotope description

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

MytPid can usually be found beneath a M. edulis or barnacle and Littorina spp.-dominated biotope (Myt.Myt; BLitX). It is found above a Laminaria digitata and piddocks-dominated biotope (Ldig.Pid).

Temporal variation

The C. maenas population may migrate offshore during the winter season.

Similar biotopes

LR.HLR.FR.RPidOccurs on fossilised peat and chalk. It has a higher density of ephemeral seaweeds such as Enteromorpha intestinalis and Ceramium spp. while M. edulis and E. modestus are usually absent.

Characterising Species

Taxa Frequency Typical Abundance % Contribution to similarity
Lanice conchilega R 1
Elminius modestus O 5
Carcinus maenas F 16
Littorina littorea F 5
Mytilus edulis F 24
Petricola pholadiformis F 4
Pholas dactylus F 1
Barnea candida F 11
Mastocarpus stellatus O 2
Ceramium F 1
Halurus flosculosus C 4
Enteromorpha intestinaloides A 8
Ulva lactuca F 6

Example photographs of biotope

No characteristic photos currently available. If you are able to provide a photograph of this biotope please contact .


Version 15.03 of the classification adds a deep-sea section to version 04.05; therefore superseding version 04.05, 97.06 and 03.02.

This online classification should be cited as:

JNCC (2015) The Marine Habitat Classification for Britain and Ireland Version 15.03 [Online]. [Date accessed]. Available from: jncc.defra.gov.uk/MarineHabitatClassification

Information from the shallower section (up to sublittoral sediment, taken from Version 04.05) be cited as the report accompanying Version 04.05, as follows:

CONNOR, D.W., J.H. ALLEN, N.GOLDING, K.L.HOWELL, L.M. LIEBERKNECHT, K.O. NORTHEN AND J.B. REKER (2004) The Marine Habitat Classification for Britain and Ireland Version 04.05. In: JNCC (2015) The Marine Habitat Classification for Britain and Ireland Version 15.03 [Online]. [Date accessed].
Available from: jncc.defra.gov.uk/MarineHabitatClassification
ISBN 1 861 07561 8


Information from the deep-sea section (added in March 2015) should be cited as the report accompanying the deep-sea section, as follows:

PARRY, M.E.V., K.L. HOWELL, B.E. NARAYANASWAMY, B.J. BETT, D.O.B. JONES, D.J. HUGHES, N. PIECHAUD, T.D. NICKELL, H. ELLWOOD, N. ASKEW, C. JENKINS and E. MANCA (2015) A Deep-sea Section for the Marine Habitat Classification of Britain and Ireland. JNCC report 530. In: JNCC (2015) The Marine Habitat Classification for Britain and Ireland Version 15.03 [Online]. [Date accessed].
Available from: jncc.defra.gov.uk/MarineHabitatClassification
ISSN 0963 8901