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SS.SCS.CCS.PomB
Pomatoceros triqueter with barnacles and bryozoan crusts on unstable circalittoral cobbles and pebbles

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Habitat (physical) description

Distribution

 Salinity: Full (30-35 ppt) 
 Wave exposure: Very exposed, Exposed, Moderately exposed 
 Tidal streams: Strong (3-6 kn), Moderately strong (1-3 kn) 
 Substratum: Cobbles and pebbles with sand 
 Zone: Circalittoral 
 Depth Band: 5-10 m, 10-20 m, 20-30 m, 30-50 m 
 Other Features: Mobile substrata 

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:
ECR.PomByC - Version: 97.06

Distribution of habitat SS.SCS.CCS.PomB  Pomatoceros triqueter with barnacles and bryozoan crusts on unstable circalittoral cobbles and pebbles
Distribution of habitat SS.SCS.CCS.PomB Pomatoceros triqueter with barnacles and bryozoan crusts on unstable circalittoral cobbles and pebbles, 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

This biotope is characterised by a few ubiquitous robust and/or fast growing ephemeral species which are able to colonise pebbles and unstable cobbles and slates which are regularly moved by wave and tidal action. The main cover organisms tend to be restricted to calcareous tube worms such as Pomatoceros triqueter (or P. lamarcki), small barnacles including Balanus crenatus and Balanus balanus, and a few bryozoan and coralline algal crusts. Scour action from the mobile substratum prevents colonisation by more delicate species. Occasionally in tide-swept conditions tufts of hydroids such as Sertularia argentea and Hydrallmania falcata are present. This biotope often grades into SMX.FluHyd which is characterised by large amounts of the above hydroids on stones also covered in Pomatoceros and barnacles. The main difference here is that SMX.FluHyd, seems to develop on more stable, consolidated cobbles and pebbles or larger stones set in sediment in moderate tides. These stones may be disturbed in the winter and therefore long-lived and fragile species are not found.

Situation

This biotope is found on exposed open coasts as well as at the entrance to marine inlets.

Temporal variation

No temporal data available.

Similar biotopes

IR.FIR.SG.CC.MoA similar shallow water biotope occurring on cobbles at the base of surge gullies
SS.SMx.CMx.FluHydAs substratum stability increases (larger rocks and less turbulent wave action) more species are able to colonise the sea bed. FluHyd, FluCoAs.SmAs and ByErSp.DysAct in that order, represent the progression from PomB to more stable mixed substrata although still with a high proportion of scour- and sand-tolerant species.

Characterising Species

Taxa Frequency Typical Abundance % Contribution to similarity Abundance (no.2)
Lanice conchilega O 1
Pomatoceros C 4
Pomatoceros triqueter F 61
Balanus balanus O 2
Balanus crenatus F 3
Bryozoa indet crusts F 5
Asterias rubens O 6
Echinus esculentus O 7

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