Biodiversity & Conservation

Alaria esculenta on exposed sublittoral fringe bedrock



Image Roger Mitchell - Exposed sublittoral fringe bedrock with Alaria esculenta, Isles of Scilly. Image width ca 1 m.
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Distribution map

IR.EIR.KFaR.Ala recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)

  • EC_Habitats

Text page icon Habitat description

Map icon Distribution of biotope in Britain and Ireland Found on wave exposed coasts in the Shetland Isles and Orkney, south east Scotland, north east England, Cornwall, Devon and the Isles of Scilly, Pembrokeshire, Ceredigionshire, north Wales, the Isle of Man, the west coasts of Ireland and Scotland including the Hebrides, St Kilda and Rockall.
National importance Widespread

Text page icon Description of biotope

For a full description of this biotope including characterizing species, distribution, survey information and references visit JNCC

Alaria esculenta forest on exposed sublittoral fringe bedrock with an encrusting fauna of mussels and barnacles. The rock surface is covered with encrusting coralline red algae. Two variants of this biotope are described. The more wave exposed of the two lacks Laminaria digitata and is also characterized by patches of mussels (EIR.Ala.Myt). The other variant is slightly less exposed and is characterized by a mixture of Alaria esculenta and Laminaria digitata (EIR.Ala.Ldig). (Information taken from the Marine Biotope Classification for Britain and Ireland, Version 97.06: Connor et al., 1997a, b).

Additional information icon Additional information

This review can be cited as follows:

Tyler-Walters, H. 2000. Alaria esculenta on exposed sublittoral fringe bedrock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 30/11/2015]. Available from: <>