Robust fucoid and/or red seaweed communities

English name: Robust fucoid and/or red seaweed communities

Quick facts

EUNIS habitat type code A1.12

Description (English)

This habitat type encompasses those seaweeds that are able to tolerate the extreme conditions of very exposed to moderately exposed rocky shores. The physical stresses caused by wave action often results in dwarf forms of the individual seaweeds. The strong holdfasts and short tufts structure of the wracks Fucus distichus and Fucus spiralis f. nana allow these fucoids to survive on extremely exposed shores in the north and north-west (A1.121). Another seaweed able to tolerate the wave-wash is the red seaweed Corallina officinalis, which can form a dense turf on the mid to lower shore (A1.122). The wrack Himanthalia elongata occurs on the lower shore and can extend on to moderately exposed shores (A1.123). The red seaweed Mastocarpus stellatus is common on both exposed and moderately exposed shores, where it may form a dense turf (particularly on vertical or overhanging rock faces, A1.125). Very exposed to moderately exposed lower eulittoral rock can support a pure stand of the red seaweed Palmaria palmata. It is found either as a dense band or in large patches above the main sublittoral fringe (A1.124). Exposed to moderately exposed lower eulittoral rock characterised by extensive areas or a distinct band of Osmundea pinnatifida (A1.126). Outcrops of fossilised peat in the eulittoral are soft enough to allow a variety of piddocks, such as Barnea candida and Petricola pholadiformis, to bore into them (A1.127). This biotope is rare. Other species such as the anemone Halichondria panicea, the barnacle Semibalanus balanoides, the limpet Patella vulgata, the mussel Mytilus edulis and the whelk Nucella lapillus can be present as well, but they are never dominant as in A1.11. There is also a higher number of seaweeds present including the red Palmaria palmata, Lomentaria articulata, Ceramium spp. and the brown seaweeds Laminaria digitata and Fucus serratus. The green seaweeds Enteromorpha intestinalis, Ulva lactuca and Cladophora rupestris are occasionally present.
Situation: This habitat type is present on extremely exposed to moderately exposed upper to lower shores.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Barnea candida
Algae Cladophora rupestris
Algae Corallina officinalis
Algae Enteromorpha intestinalis
Algae Fucus distichus
Algae Fucus serratus
Invertebrates Halichondria panicea
Algae Himanthalia elongata
Algae Laminaria digitata
Algae Lomentaria articulata
Algae Mastocarpus stellatus
Invertebrates Mytilus edulis
Invertebrates Nucella lapillus
Algae Palmaria palmata
Invertebrates Patella vulgata
Invertebrates Petricola pholadiformis
Invertebrates Semibalanus balanoides
Algae Ulva lactuca
Species scientific name English common name Species group
Barnea candida Invertebrates
Cladophora rupestris Algae
Corallina officinalis Algae
Enteromorpha intestinalis Algae
Fucus distichus Algae
Fucus serratus Algae
Halichondria panicea Invertebrates
Himanthalia elongata Algae
Laminaria digitata Algae
Lomentaria articulata Algae
Mastocarpus stellatus Algae
Mytilus edulis Invertebrates
Nucella lapillus Dog whelk Invertebrates
Palmaria palmata Algae
Patella vulgata Invertebrates
Petricola pholadiformis 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 Robust fucoid and/or red seaweed communities 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 A1.12 Robust fucoid and/or red seaweed communities same
EUNIS Habitat Classification 200308 A1.12 Robust fucoids or red seaweeds on very exposed littoral rock narrower
EUNIS Habitat Classification 200308 A1.23 Red seaweeds on moderately exposed littoral rock narrower
EUNIS Habitat Classification 200202 A1.23 Red seaweeds on moderately exposed littoral rock narrower
EUNIS Habitat Classification 200202 A1.12 Robust fucoids or red seaweeds on very exposed littoral rock narrower
EUNIS Habitat Classification 199910 A1.22 Red seaweeds on moderately exposed littoral rock narrower
EUNIS Habitat Classification 199910 A1.12 Robust fucoids or red seaweeds on very exposed littoral rock narrower
EUNIS Habitat Classification 199811 A1.12 Robust fucoids or red seaweeds on very exposed rock narrower
EUNIS Habitat Classification 199811 A1.22 Red seaweeds on moderately exposed rock narrower
EUNIS Habitat Classification 199712 A1.32 Red seaweeds on moderately exposed rock narrower
EUNIS Habitat Classification 199712 A1.22 Robust fucoids on very exposed rock narrower
MNCR BioMar 97.06 (Britain & Ireland) ELR.FR Robust fucoids or red seaweeds narrower
MNCR BioMar 97.06 (Britain & Ireland) MLR.R Red seaweeds (moderately exposed shores) narrower
MNCR BioMar 96.7 (Britain & Ireland) MLR.R   narrower
MNCR BioMar 96.7 (Britain & Ireland) ELR.Fdis   same
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