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Marine Habitat Classification


Description of biotope or habitat type

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   Ceramium sp. and piddocks on eulittoral fossilised peat


Habitat (physical) description

Salinity Full (30-35 ppt)
Wave exposure Moderately exposed
Tidal streams
Substratum Peat
Zone Eulittoral
Depth Band
Other Features Soft rock

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.HLR.FR.RPid <I>Ceramium</I> sp. and piddocks on eulittoral fossilised peat

  • Records used to define the biotope (core records)
  • Other records assigned to this biotope, marked as 'certain'
  • Other records assigned to this biotope, marked as 'uncertain'

Point data based on records in the UK Marine Recorder Snapshot.

Description

Outcrops of fossilised peat in the eulittoral are soft enough to allow a variety of piddocks such as Barnea candida and Petricola pholadiformis to bore into them. The surface of the peat can be characterised by a dense algal mat, predominantly the red seaweed Ceramium spp. and with the green seaweeds Ulva lactuca and Enteromorpha intestinalis. Damp areas in the algal mat are covered by aggregations of the polychaetes Lanice conchilega and Polydora sp. The crabs Carcinus maenas and Cancer pagurus occur in crevices in the peat. Small pools on the peat may contain hydroids, such as Obelia longissima and Kirchenpaueria pinnata, the brown alga Dictyota dichotoma and the crustacean Crangon crangon. Description derived largely from sites in north Norfolk and this community could possibly be found on other "soft" substrata. Further records of this community are required in order to validate the description.

Situation

More records required

Temporal variation

Unknown.

Characterising Species

Taxon Relative importance of taxon for defining this community (%) Typical abundance - SACFOR scale % of core records where taxon was recorded
Obelia longissima 6 Occasional 61-80 %
Polydora 11 Common 61-80 %
Lanice conchilega 19 Frequent 81-100 %
Carcinus maenas 6 Occasional 61-80 %
Petricola pholadiformis 13 Common 61-80 %
Barnea candida 6 Common 21-40 %
Ceramium 1 Common 1-20 %
Enteromorpha intestinalis 13 Common 61-80 %
Ulva lactuca 20 Common 81-100 %

Similar biotopes

LR.MLR.BF.Fser.Pid
Occurs in similar physical conditions, but the soft rock allows a Fucus serratus community to develop instead of the ephemeral seaweeds of RPid.

Biotope history

Classification Habitat code
6.95 LRK.PID.PEAT
96.7 MLR.R.Pid

Photos

LR.HLR.FR.RPid Ceramium sp. and piddocks on eulittoral fossilised peat, Unspecified location. Tim Hill © JNCC
LR.HLR.FR.RPid Ceramium sp. and piddocks on eulittoral fossilised peat, Unspecified location. Tim Hill © JNCC
LR.HLR.FR.RPid Ceramium sp. and piddocks on eulittoral fossilised peat, Unspecified location. Tim Hill © JNCC
LR.HLR.FR.RPid Ceramium sp. and piddocks on eulittoral fossilised peat, Unspecified location. Tim Hill © JNCC
LR.HLR.FR.RPid Ceramium sp. and piddocks on eulittoral fossilised peat, Borth Beach. Rohan Holt © JNCC
LR.HLR.FR.RPid Ceramium sp. and piddocks on eulittoral fossilised peat, Borth Beach. Rohan Holt © JNCC

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