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LR.FLR.Eph.EntPor
Porphyra purpurea and Enteromorpha spp. on sand-scoured mid or lower eulittoral rock

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Habitat (physical) description

Distribution

 Salinity: Full (30-35 ppt), Variable (18-35 ppt) 
 Wave exposure: Exposed, Moderately exposed 
 Tidal streams:  
 Substratum: Bedrock; boulders 
 Zone: Eulittoral 
 Depth Band: Mid shore 
 Other Features: Sand-scour 

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.Eph.Por - Version: 96.7
LRK.EPH - Version: 6.95

Distribution of habitat LR.FLR.Eph.EntPor  Porphyra purpurea and Enteromorpha spp. on sand-scoured mid or lower eulittoral rock
Distribution of habitat LR.FLR.Eph.EntPor Porphyra purpurea and Enteromorpha spp. on sand-scoured mid or 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

Exposed and moderately exposed mid-shore bedrock and boulders occurring adjacent to areas of sand which significantly affects the rock. As a consequence of sand-abrasion, wracks such as Fucus vesiculosus or Fucus spiralis are scarce and the community is typically dominated by ephemeral red or green seaweeds, particularly the foliose red seaweed Porphyra purpurea and green seaweeds such as Enteromorpha spp. Under the blanket of ephemeral seaweeds, the barnacles Semibalanus balanoides or Elminius modestus and the limpet Patella vulgata may occur in the less scoured areas, along with the occasional winkles Littorina littorea and Littorina saxatilis. Few other species are present.

Situation

Usually found below the species impoverished biotope dominated by Enteromorpha spp. (Ent) and above the F. spiralis zone (Fspi). It may replace the zone dominated by the wrack Pelvetia canaliculata (PelB). In areas where sand abrasion is less severe, the sand-binding red alga Rhodothamniella floridula occurs with other sand-tolerant seaweeds and the wrack Fucus serratus (Rho), along with the mussel Mytilus edulis.

Temporal variation

Seasonal fluctuations in the abundance of the Enteromorpha spp. and the P. purpurea will occur, especially as a result of storm action.

Similar biotopes

LR.FLR.Eph.EntOccurs from the mid eulittoral to the supralittoral zone, often in freshwater influenced habitats. It has a lower species richness and the red seaweed P. purpurea and the wracks F. spiralis or F. vesiculosus are usually not present. The winkle L. littorea is also absent.
LR.FLR.Eph.EphXOccurs in more estuarine conditions and on mixed substrata. A very similar biotope.

Characterising Species

Taxa Frequency Typical Abundance % Contribution to similarity
Elminius modestus O 2
Semibalanus balanoides O 6
Patella vulgata O 3
Littorina littorea O 7
Littorina saxatilis O 3
Mytilus edulis F 2
Porphyra F 2
Porphyra purpurea F 11
Fucus vesiculosus O 3
Fucus vesiculosus O 3
Enteromorpha A 48
Enteromorpha intestinalis P 3
Enteromorpha prolifera P 2
Ulva lactuca F 2

Example photographs of biotope


Short rock slope leading onto sand with Porphyra, Pentine Point East, Newquay., David Connor, © JNCC Fallen chalk blocks covered in Enteromorpha, Shakespeare Cliff, Dover., David George, © JNCC Rock surrounded by sand with Enteromorpha and fucoids, Great Carr, North Berwick., David Connor, © JNCC
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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