EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A1 - Littoral rock and other hard substrata > A1.1 - High energy littoral rock > A1.12 - Robust fucoid and/or red seaweed communities > A1.125 - Mastocarpus stellatus and Chondrus crispus on very exposed to moderately exposed lower eulittoral rock

Mastocarpus stellatus and Chondrus crispus on very exposed to moderately exposed lower eulittoral rock

English name: Mastocarpus stellatus and Chondrus crispus on very exposed to moderately exposed lower eulittoral rock

Quick facts

EUNIS habitat type code A1.125

Description (English)

Exposed to moderately exposed lower eulittoral vertical to almost horizontal bedrock characterised by a dense turf of Mastocarpus stellatus and Chondrus crispus (either together or separately). Beneath these foliose seaweeds the rock surface is covered by encrusting coralline algae and the barnacle Semibalanus balanoides, the limpet Patella vulgata and spirorbid polychaetes. Other seaweeds including the red Lomentaria articulata and Osmundea pinnatifida, Palmaria palmata, Corallina officinalis and coralline crusts. The wrack Fucus serratus and the green seaweeds Enteromorpha intestinalis and Ulva lactuca may also be present though usually at a low abundance. Although both M. stellatus and C. crispus are widespread in the lower eulittoral and the sublittoral fringe, they occur only infrequently in a distinct band, or in large enough patches, to justify separation from A1.2141. Consequently, where only small patches of these species occur within a larger area of mixed red algal turf, then records should be assigned to more general mixed red algal turf biotope (A1 122; A1.123). M. stellatus can be present in high abundance in a number of biotopes (A1 122: A1.123; A1.2141 etc.) found on the shore. At least one other species normally co-dominates and records should be assigned to the appropriate biotope. Caution should be taken regarding the characterising species list due to the low number of records. More information needed to validate this description.
Situation: This biotope can form a band above the main kelp zone, above Alaria esculenta (A3.111) or the mussel Mytilus edulis (A1.111) or within a F. serratus-red algal mosaic (A1.2141).
Temporal variation: M. stellatus is more resistant to wave action than C. crispus and may therefore dominate more exposed shores; it can dominate vertical rock at very exposed sites (e.g. Mingulay, Outer Hebrides). On more sheltered shores, especially in the south-west, M. stellatus may give way to C. crispus which has a faster growth rate.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Alaria esculenta
Algae Chondrus crispus
Algae Corallina officinalis
Algae Enteromorpha intestinalis
Algae Fucus serratus
Algae Lomentaria articulata
Algae Mastocarpus stellatus
Invertebrates Mytilus edulis
Algae Osmundea pinnatifida
Algae Palmaria palmata
Invertebrates Patella vulgata
Invertebrates Semibalanus balanoides
Algae Ulva lactuca
Species scientific name English common name Species group
Alaria esculenta Algae
Chondrus crispus Algae
Corallina officinalis Algae
Enteromorpha intestinalis Algae
Fucus serratus Algae
Lomentaria articulata Algae
Mastocarpus stellatus Algae
Mytilus edulis Invertebrates
Osmundea pinnatifida Algae
Palmaria palmata Algae
Patella vulgata Invertebrates
Semibalanus balanoides Invertebrates
Ulva lactuca Algae

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.HLR.FR.Mas <I>Mastocarpus stellatus</I> and <I>Chondrus crispus</I> on very exposed to moderately exposed lower eulittoral rock source
CORINE Land Cover 4.2.3. Intertidal flats n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A1.125 Mastocarpus stellatus and Chondrus crispus on very exposed to moderately exposed lower eulittoral rock same
EUNIS Habitat Classification 200308 A1.233 Mastocarpus stellatus and Chondrus crispus on very exposed to moderately exposed lower eulittoral rock same
EUNIS Habitat Classification 200202 A1.233 Mastocarpus stellatus and Chondrus crispus on very to moderately exposed lower eulittoral rock same
EUNIS Habitat Classification 199910 A1.223 Mastocarpus stellatus and Chondrus crispus on very to moderately exposed lower eulittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) MLR.R.Mas Mastocarpus stellatus and Chondrus crispus on very to moderately exposed lower eulittoral rock same
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