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LR.MLR.MusF.MytFR
Mytilus edulis, Fucus serratus and red seaweeds on moderately exposed lower eulittoral rock

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Habitat (physical) description

Distribution

 Salinity: Full (30-35 ppt) 
 Wave exposure: Moderately exposed 
 Tidal streams:  
 Substratum: Bedrock; large boulders 
 Zone: Eulittoral - lower 
 Depth Band:  
 Other Features: Sand or silt affected 

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.Myt.R - Version: 96.7

Distribution of habitat LR.MLR.MusF.MytFR  Mytilus edulis, Fucus serratus and red seaweeds on moderately exposed lower eulittoral rock
Distribution of habitat LR.MLR.MusF.MytFR Mytilus edulis, Fucus serratus and red seaweeds on moderately exposed lower eulittoral rock, 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

Lower eulittoral moderately exposed bedrock covered by a dense community of large individuals of the mussel Mytilus edulis, often with a scarce covering of the wrack Fucus serratus and red seaweeds. The red seaweeds may include Palmaria palmata, Mastocarpus stellatus, Ceramium spp., Audouinella spp. and Chondrus crispus. Ephemeral green seaweeds such as Enteromorpha intestinalis and Ulva lactuca commonly occur on the shells of the mussels. The barnacle Semibalanus balanoides is common on both the mussel valves and on patches of bare rock, where the limpet Patella vulgata is also found, often at high abundance. The whelk Nucella lapillus and the winkle Littorina littorea occur within the mussel bed, as well as the polychaete Pomatoceros triqueter and the crab Carcinus maenas. The anemone Actinia equina is present in cracks and crevices. These moist areas can be overgrown by coralline crusts.

Situation

Above this biotope on sand influenced shores is a M. edulis and F. vesiculosus dominated biotope (MytFves). In the sublittoral fringe below MytFR is a biotope dominated by the kelp Laminaria digitata (Ldig.Ldig).

Temporal variation

Unknown.

Similar biotopes

LR.HLR.MusB.MytBOccurs on more exposed shores. Has lower species richness with the notable absence of species such as F. serratus and L. littorea.
LR.MLR.MusF.MytFvesOccurs in similar wave exposure though in the mid eulittoral zone. F. vesiculosus dominates though F. serratus can be present in low abundance. Kelp such as L. digitata are not present and usually the abundance of the red seaweeds is lower.
LS.LBR.LMus.MytOccurs on mixed substrata, and F. serratus is typically absent, while L. littorea occurs in higher abundance. Red seaweeds are usually not scarce; the barnacle Elminius modestus can be present.

Characterising Species

Taxa Frequency Typical Abundance % Contribution to similarity
Actinia equina O 1
Pomatoceros triqueter O 1
Semibalanus balanoides C 9
Carcinus maenas F 1
Patella vulgata O 5
Littorina littorea F 2
Nucella lapillus F 6
Mytilus edulis A 29
Audouinella F 2
Palmaria palmata O 5
Corallinaceae F 2
Chondrus crispus O 1
Mastocarpus stellatus F 5
Ceramium F 2
Fucus serratus C 4
Enteromorpha intestinalis C 4
Ulva lactuca O 4

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