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Marine Habitat Classification


Description of biotope or habitat type

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   Pelvetia canaliculata on sheltered littoral fringe rock


Habitat (physical) description

Salinity Full (30-35 ppt), Variable (18-35 ppt)
Wave exposure Sheltered, Very sheltered, Extremely sheltered
Tidal streams
Substratum Bedrock; stable boulders; cobbles
Zone Littoral fringe - lower
Depth Band Upper shore
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 LR.LLR.F.Pel <I>Pelvetia canaliculata</I> on sheltered littoral fringe 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

Lower littoral fringe bedrock or stable boulders and mixed substrata in sheltered to extremely sheltered conditions characterised by a dense cover of the wrack Pelvetia canaliculata. The biotope may be present in localised sheltered patches on moderately exposed shores. P. canaliculata overgrows a crust of black lichens Verrucaria maura or the non-calcified red algae Hildenbrandia rubra on very sheltered shores. Individuals of the wrack Fucus spiralis can usually be found among the P. canaliculata and/or in lower part of the biotope. This biotope lacks the density of barnacles found amongst the P. canaliculata on more exposed shores. The winkle Littorina saxatilis occurs, as do a variety of amphipods. The red alga Catenella caespitosa can be present especially in more shaded areas while the green seaweed Enteromorpha spp. can be present in moist areas.

Situation

This biotope is found in the lower littoral fringe on sheltered shores below biotopes dominated by V. maura (Ver.Ver) and above biotopes dominated by F. spiralis (Fspi). Though not typical, this biotope may occur on moderately exposed shores where local topography provides shelter.

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
Littorina saxatilis 19 Frequent 61-80 %
Hildenbrandia rubra 2 Occasional 21-40 %
Fucus spiralis 3 Occasional 41-60 %
Pelvetia canaliculata 51 Common 81-100 %
Verrucaria maura 14 Common 41-60 %

Similar biotopes

LR.MLR.BF.PelB
Occurs on shores with a slightly higher exposure, but otherwise in similar physical conditions. Barnacles such as Chthamalus montagui, Chthamalus stellatus or Semibalanus balanoides are always present and the limpet Patella vulgata can be present.

Biotope history

Classification Habitat code
6.95 LRK.PEL in part
97.06 SLR.Pel in part

Photos

LR.LLR.F.Pel Pelvetia canaliculata on sheltered littoral fringe rock, Droman. ANON © JNCC
LR.LLR.F.Pel Pelvetia canaliculata on sheltered littoral fringe rock, Droman. ANON © JNCC
LR.LLR.F.Pel Pelvetia canaliculata on sheltered littoral fringe rock, Northumberland. Keith Hiscock © JNCC
LR.LLR.F.Pel Pelvetia canaliculata on sheltered littoral fringe rock, Northumberland. Keith Hiscock © JNCC
LR.LLR.F.Pel Pelvetia canaliculata on sheltered littoral fringe rock, St Michaels Chapel. ANON © JNCC
LR.LLR.F.Pel Pelvetia canaliculata on sheltered littoral fringe rock, St Michaels Chapel. ANON © JNCC

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