EUNIS habitat classification 2017 > M - Marine benthic habitats > MA1 - Littoral rock > MA12 - Atlantic littoral rock > MA123 - Seaweed communities on full salinity Atlantic littoral rock > MA123E - Ascophyllum nodosum on very sheltered mid eulittoral rock

Ascophyllum nodosum on very sheltered mid eulittoral rock

Quick facts

EUNIS habitat type code MA123E
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Description (English)

Sheltered to extremely sheltered mid eulittoral rock with the wrack Ascophyllum nodosum. The red seaweed Polysiphonia lanosa is often found growing as an epiphyte on the A. nodosum fronds while disturbed areas among the A. nodosum is colonised by the wrack Fucus vesiculosus and the green seaweed Enteromorpha intestinalis.e barnacle Semibalanus balanoides, the limpet Patella vulgata and Littorina littorea can all be found on the bedrock underneath the A. nodosum canopy along with coralline crusts. The whelk Nucella lapillus can be found preying on the barnacles and limpets. Three variants of this biotope are described. These are: full salinity (unit MA1-23E1), mixed substrata (unit MA1-23E2) and the loose lying growth form A. nodosum ecad mackaii found on very sheltered shores (MA1-255). Two other biotopes has been identified as well tide-swept (MA1-238) and variable salinity (MA1-254).
Situation: This biotope is usually found between the wrack Fucus spiralis (MA1-23C) and F. serratus dominated biotopes (MA1-23F), although on some shores a narrow zone of F. vesiculosus (MA1-23D) may occur immediately above the A. nodosum. With increasing wave exposure the A. nodosum canopy is replaced by F. vesiculosus (MA1-243; MA1-23D). Unit MA1-23E can occur on more exposed shores, where there is localised shelter.
Temporal variation: A. nodosum communities are generally very stable communities with individual plants reaching ages of more than 25 years on shores with little wave-action.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Ascophyllum nodosum
Algae Enteromorpha intestinalis
Algae Fucus spiralis
Algae Fucus vesiculosus
Algae Polysiphonia lanosa
Invertebrates Littorina littorea
Invertebrates Nucella lapillus
Invertebrates Patella vulgata
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Ascophyllum nodosum Algae
Enteromorpha intestinalis Algae
Fucus spiralis Algae
Fucus vesiculosus Algae
Polysiphonia lanosa Algae
Littorina littorea Invertebrates
Nucella lapillus Dog whelk Invertebrates
Patella vulgata Invertebrates
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A1.314 Ascophyllum nodosum on very sheltered mid eulittoral rock same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A1.314 Ascophyllum nodosum on very sheltered mid eulittoral rock same
EUNIS Habitat Classification 200308 A1.314 Ascophyllum nodosum on very sheltered mid eulittoral rock same
EUNIS Habitat Classification 200202 A1.314 Ascophyllum nodosum on very sheltered mid eulittoral rock same
EUNIS Habitat Classification 199910 A1.314 Ascophyllum nodosum on very sheltered mid eulittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) SLR.F.Asc Ascophyllum nodosum on very sheltered mid eulittoral rock same
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