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LR.FLR.Rkp.Cor.Par
Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools

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Habitat (physical) description

Distribution

 Salinity: Full (30-35 ppt) 
 Wave exposure: Very exposed, Exposed 
 Tidal streams:  
 Substratum: Bedrock 
 Zone: Eulittoral 
 Depth Band:  
 Other Features: Rockpool 

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.
Distribution of habitat LR.FLR.Rkp.Cor.Par  Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools
Distribution of habitat LR.FLR.Rkp.Cor.Par Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools, 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

Shallow and relatively smal rockpools throughout the eulittoral zone on very exposed to exposed shores, characterised by a covering of encrusting coralline algae on which Corallina officinalis forms a dense turf. The bottom of these pools can be covered in coarse gravel and cobbles. In south and west Ireland these coralline pools may be dominated by the sea urchin Paracentrotus lividus and the seaweed diversity is generally low due to the grazing pressure of P. lividus, the top shells Gibbula cineraria and Gibbula umbilicalis, and winkles such as Littorina littorea. Within the pools, pits and crevices are often occupied by the anemone such as Actinia equina and Anemonia viridis and small individuals of the mussel Mytilus edulis. The siphonous green seaweed Codium spp. can also be present along with the wrack Himanthalia elongata and the brown seaweed Leathesia difformis and the filamentous red seaweed Ceramium spp. The barnacle Semibalanus balanoides is either absent or occurs at low abundance in these rockpools, presumably due to the grazing pressure on the larval stage and the predation pressure from the whelk Nucella lapillus. Soft bedrock, such as limestone, allows P. lividus to bore into the rock.

Situation

Rockpools throughout the eulittoral and lower littoral fringe in bedrock on very exposed to exposed shores.

Temporal variation

The ephemeral green seaweeds Enteromorpha intestinalis and Ulva lactuca can occur during the summer.

Similar biotopes

LR.FLR.Rkp.Cor.CorOccurs in similar physical conditions over a wide range of wave exposures. P. lividus is not present and foliose red seaweeds such as Mastocarpus stellatus and Chondrus crispus can be present.
LR.FLR.Rkp.Cor.BifOccurs in similar physical conditions. The brown seaweed Bifurcaria bifurcata dominate this biotope. The diversity of red seaweeds is higher, and includes species such as Palmaria palmata and Gastroclonium ovatum.
LR.FLR.Rkp.Cor.CysOccurs in similar physical conditions. The brown seaweed Cystoseira spp. dominates though species such as Scytosiphon lomentaria, Laminaria digitata and Laminaria hyperborea are usually present (Rare to Occasional).

Characterising Species

Taxa Frequency Typical Abundance % Contribution to similarity
Actinia equina F 8
Anemonia viridis R 1
Gibbula cineraria F 1
Gibbula umbilicalis O 4
Patella vulgata F 6
Littorina littorea C 3
Nucella lapillus O 2
Mytilus edulis O 1
Paracentrotus lividus C 17
Corallinaceae A 16
Corallina officinalis C 11
Ceramium O 3
Leathesia difformis O 1
Himanthalia elongata R 1
Enteromorpha intestinaloides F 5
Ulva lactuca O 5
Codium O 3
Codium O 3

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