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LR.FLR.Rkp.G
Green seaweeds (Enteromorpha spp. and Cladophora spp.) in shallow upper shore rockpools

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Habitat (physical) description

Distribution

 Salinity: Full (30-35 ppt), Variable (18-35 ppt) 
 Wave exposure: Very exposed, Exposed, Moderately exposed, Sheltered 
 Tidal streams:  
 Substratum: Bedrock 
 Zone: Eulittoral - upper, Littoral fringe 
 Depth Band: Upper shore 
 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.

Previous code

This biotope occurred in previous versions of the classification as:
RKP.G - Version: 96.7
LRK.CHL - Version: 95.6

Distribution of habitat LR.FLR.Rkp.G  Green seaweeds (Enteromorpha spp. and Cladophora spp.) in shallow upper shore rockpools
Distribution of habitat LR.FLR.Rkp.G Green seaweeds (Enteromorpha spp. and Cladophora spp.) in shallow upper shore 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

Rockpools in the littoral fringe or upper eulittoral zone subject to widely fluctuating temperatures and salinity are characterised by ephemeral green alga of the genus Enteromorpha, along with Cladophora spp. and Ulva lactuca. Due to the physical stress imposed on these upper shore pools, grazing molluscs such as the limpet Patella vulgata and the winkles Littorina littorea and Littorina saxatilis are generally in lower abundance than eulittoral pools, allowing the green seaweeds to proliferate under reduced grazing pressures. The bright orange copepod Tigriopus fulvus is tolerant of large salinity fluctuations and may occur in large numbers in these upper shore pools, along with gammarid amphipods.

Situation

Rockpools throughout the upper eulittoral and lower littoral fringe in bedrock.

Temporal variation

Fluctuations especially in the abundance of the green seaweeds will occur due to marked changes in salinity and temperature during the year. Enteromorpha intestinalis can often be bleached during the summer.

Similar biotopes

LR.FLR.Eph.EntOccurs on very exposed to very sheltered shores from the supralittoral to the upper eulittoral zone. This biotope does not includes rockpools. It has a similar species composition.

Characterising Species

Taxa Frequency Typical Abundance % Contribution to similarity
Patella vulgata O 2
Littorina littorea F 4
Littorina saxatilis O 3
Enteromorpha intestinalis A 77
Cladophora rupestris F 5

Example photographs of biotope


Rockpool G with green seaweeds, Saltpan Rocks, Farnes, Dale Cartlidge, © JNCC Rockpool with green and red seaweeds, Oxwich, ANON, © JNCC Intertidal pool with Cladophora, Orkney?, ANON, © JNCC
Click on an image for a larger view


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