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Marine Habitat Classification


Description of biotope or habitat type

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   Chrysophyceae and Haptophyceae on vertical upper littoral fringe soft rock


Habitat (physical) description

Salinity Full (30-35 ppt), Variable (18-35 ppt)
Wave exposure Moderately exposed
Tidal streams
Substratum Bedrock
Zone Littoral fringe - upper
Depth Band
Other Features Vertical; 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.FLR.CvOv.ChrHap Chrysophyceae and Haptophyceae on vertical upper littoral fringe soft rock

  • 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

Orange, brownish or blackish gelatinous bands of algae at high tide and supralittoral levels on open cliff faces and on upper walls and ceilings at entrances and to the rear of upper and mid-shore hard and soft rock (chalk) caves. This dark brown band consists of an assemblage of Haptophyceae such as Apistonema spp., Pleurochrysis carterae and the orange Chrysotila lamellosa, but other genera and species of Chrysophyceae, Haptophyceae and Prasinophyceae are likely to be present as well. Species such as Entodesmis maritima and Thallochrysis littoralis and the filamentous green alga Epicladia perforans are often associated with Apistonema spp. and the latter can form a green layer beneath the Apistonema spp. Associated with this splash zone algal community is an assemblage of animals of terrestrial origin, with red mites, insects and centipedes commonly found. These species descend into the community as the tide falls and retreat as the tide rises. The most common truly 'marine' species is the small winkle Melarhaphe neritoides.

Situation

This description is partly based on a Thanet intertidal survey (Tittley & Spurrier 2001). More information is needed to identify the species composition and dominant species of this biotope.

Temporal variation

During summer the gelatinous growth dries and often peels off.

Characterising Species

Taxon
Thallochrysis litoralis
Apistonema carterae
Melarhaphe neritoides
Entodesmsis maritima
Entocladia perforans

Similar biotopes

LR.FLR.CvOv.AudPil
Golden brown velvety growths of the brown algae Pilinia maritima occurring in mats with the red alga Audouinella purpurea on cave walls and upper littoral levels of cliffs.

Biotope history

Classification Habitat code
97.06 LR.Chr
6.95 LRK.CHR

Photos

LR.FLR.CVOV.ChrHap Chrysophyceae and Haptophyceae on vertical upper littoral fringe soft rock, Culver Cliff (North). David George © JNCC
LR.FLR.CVOV.ChrHap Chrysophyceae and Haptophyceae on vertical upper littoral fringe soft rock, Culver Cliff (North). David George © JNCC
LR.FLR.CVOV.ChrHap Chrysophyceae and Haptophyceae on vertical upper littoral fringe soft rock, Thanet. Kate Northen © JNCC
LR.FLR.CVOV.ChrHap Chrysophyceae and Haptophyceae on vertical upper littoral fringe soft rock, Thanet. Kate Northen © JNCC
LR.FLR.CVOV.ChrHap Chrysophyceae and Haptophyceae on vertical upper littoral fringe soft rock, Thanet, Kent. Tim Hill © JNCC
LR.FLR.CVOV.ChrHap Chrysophyceae and Haptophyceae on vertical upper littoral fringe soft rock, Thanet, Kent. Tim Hill © JNCC

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