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 > A1.123 - Himanthalia elongata and red seaweeds on exposed lower eulittoral rock

Himanthalia elongata and red seaweeds on exposed lower eulittoral rock

English name: Himanthalia elongata and red seaweeds on exposed lower eulittoral rock

Quick facts

EUNIS habitat type code A1.123

Description (English)

Exposed to moderately exposed lower eulittoral bedrock characterised by the wrack Himanthalia elongata with a dense turf of red seaweeds beneath. H. elongata may occur on tide-swept, sheltered shores in sea lochs (e.g. Loch Maddy). The wrack Fucus serratus is normally present as well. The predominant red seaweeds are usually Mastocarpus stellatus, Osmundea pinnatifida, Corallina officinalis and Palmaria palmata that tend to grow over a crust of the pink coralline algae Lithothamnion spp. Any patches between the algal turf may be colonised by barnacles Semibalanus balanoides, or Balanus perforatus in the south-west, and by the limpet Patella vulgata. Pits and crevices in the rock often provide a refuge for the whelk Nucella lapillus, the winkle Littorina spp. and small individuals of the mussel Mytilus edulis. Besides the dominant seaweeds there are a number of other red, brown and green seaweeds present. These include species such as the red seaweeds Dumontia contorta, Lomentaria articulata, Porphyra spp., the kelp Laminaria digitata and the green seaweeds Enteromorpha intestinalis, Ulva lactuca and Cladophora rupestris.
Situation: On some shores this biotope may occur as a distinct zone between a Fucus serratus and red algal turf (A1.2141) and the kelp Alaria esculenta and L. digitata community (A3.1112). This biotope generally characterises those shores which are too exposed for F. serratus to form a dense canopy, often occurring as large patches within the F. serratus / red seaweed turf zone (A1.2141). Consequently, F. serratus plants frequently occur amongst the H. elongata and red seaweed turf.
Temporal variation: In early spring only characteristic H. elongata buttons are present, while the long erect parts of the thalli appears later in the season. This biotope may therefore appear very similar to A1.1221 in the spring and care should be taken when assessing these biotopes in early spring (See Similar biotopes).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Alaria esculenta
Algae Cladophora rupestris
Algae Corallina officinalis
Algae Dumontia contorta
Algae Enteromorpha intestinalis
Algae Fucus serratus
Algae Himanthalia elongata
Algae Laminaria digitata
Algae Lomentaria articulata
Algae Mastocarpus stellatus
Algae Osmundea pinnatifida
Algae Palmaria palmata
Algae Ulva lactuca
Invertebrates Balanus perforatus
Invertebrates Mytilus edulis
Invertebrates Nucella lapillus
Invertebrates Patella vulgata
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Alaria esculenta Algae
Cladophora rupestris Algae
Corallina officinalis Algae
Dumontia contorta Algae
Enteromorpha intestinalis Algae
Fucus serratus Algae
Himanthalia elongata Algae
Laminaria digitata Algae
Lomentaria articulata Algae
Mastocarpus stellatus Algae
Osmundea pinnatifida Algae
Palmaria palmata Algae
Ulva lactuca Algae
Balanus perforatus Invertebrates
Mytilus edulis Invertebrates
Nucella lapillus Dog whelk Invertebrates
Patella vulgata Invertebrates
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.HLR.FR.Him <I>Himanthalia elongata</I> and red seaweeds on 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 A1.123 Himanthalia elongata and red seaweeds on exposed lower eulittoral rock same
EUNIS Habitat Classification 200308 A1.123 Himanthalia elongata and red seaweeds on exposed lower eulittoral rock same
EUNIS Habitat Classification 200202 A1.123 Himanthalia elongata and red seaweeds on exposed lower eulittoral rock same
EUNIS Habitat Classification 199910 A1.123 Himanthalia elongata and red seaweeds on exposed lower eulittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) ELR.FR.Him Himanthalia elongata and red seaweeds on exposed lower eulittoral rock same
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