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Marine Habitat Classification


Description of biotope or habitat type

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   Mixed faunal turf communities


Habitat (physical) description

Salinity Full (30-35 ppt)
Wave exposure Extremely exposed, Very exposed, Exposed, Moderately exposed
Tidal streams Strong (3-6 kn), Moderately strong (1-3 kn)
Substratum Bedrock, boulders
Zone Circalittoral - lower, Circalittoral - upper
Depth Band 5-10 m, 10-20 m, 20-30 m
Other Features

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 CR.HCR.XFa Mixed faunal turf communities

  • 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'
  • Predicted extent of the level 3 (for sublittoral rock & deep sea) or 4 (for sublittoral sediment) habitat

Point data based on records in the UK Marine Recorder Snapshot. Predicted habitat extent is from UKSeaMap.

Description

This biotope complex occurs on wave-exposed circalittoral bedrock and boulders, subject to tidal streams ranging from strong to moderately strong. This complex is characterised by its diverse range of hydroids (Halecium halecinum, Nemertesia antennina and Nemertesia ramosa), bryozoans (Alcyonidium diaphanum, Flustra foliacea, Bugula flabellata and Bugula plumosa) and sponges (Scypha ciliata, Pachymatisma johnstonia, Cliona celeta, Raspailia ramosa, Esperiopsis fucorum, Hemimycale columella and Dysidea fragilis) forming an often dense, mixed faunal turf. Other species found within this complex are Alcyonium digitatum, Urticina felina, Sagartia elegans, Actinothoe sphyrodeta, Caryophyllia smithii, Pomatoceros triqueter, Balanus crenatus, Cancer pagurus, Necora puber, Asterias rubens, Echinus esculentus and Clavelina lepadiformis. Nine biotopes have been identified within this complex: ByErSp, FluCoAs, FluHocu, CvirCri, SwiLgAs, Mol, SubCriTf, SpNemAdia and SpAnVt.

Situation

No situation data available.

Temporal variation

No temporal variation data available.

Characterising Species

Taxon Typical abundance - SACFOR scale % of core records where taxon was recorded
Scypha ciliata Occasional 41-60 %
Pachymatisma johnstonia Occasional 41-60 %
Cliona celata Occasional 61-80 %
Esperiopsis fucorum Occasional 41-60 %
Hemimycale columella Occasional 41-60 %
Raspailia ramosa Occasional 41-60 %
Dysidea fragilis Occasional 41-60 %
Halecium halecinum Occasional 41-60 %
Nemertesia antennina Frequent 61-80 %
Nemertesia ramosa Occasional 41-60 %
Alcyonium digitatum Frequent 81-100 %
Urticina felina Occasional 41-60 %
Sagartia elegans Occasional 41-60 %
Actinothoe sphyrodeta Occasional 41-60 %
Caryophyllia smithii Frequent 41-60 %
Pomatoceros triqueter Occasional 41-60 %
Balanus crenatus Frequent 41-60 %
Cancer pagurus Occasional 41-60 %
Necora puber Occasional 41-60 %
Calliostoma zizyphinum Occasional 41-60 %
Alcyonidium diaphanum Frequent 61-80 %
Flustra foliacea Frequent 61-80 %
Bugula flabellata Occasional 41-60 %
Bugula plumosa Frequent 41-60 %
Asterias rubens Frequent 81-100 %
Echinus esculentus Occasional 41-60 %
Clavelina lepadiformis Occasional 41-60 %

Similar biotopes

Not applicable or unknown.

Biotope history

Classification Habitat code
97.06 CR.MCR.XFa

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