EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A1 - Littoral rock and other hard substrata > A1.3 - Low energy littoral rock > A1.32 - Fucoids in variable salinity > A1.324 - Ascophyllum nodosum and Fucus vesiculosus on variable salinity mid eulittoral rock

Ascophyllum nodosum and Fucus vesiculosus on variable salinity mid eulittoral rock

English name: Ascophyllum nodosum and Fucus vesiculosus on variable salinity mid eulittoral rock

Description (English)

Very sheltered to extremely sheltered mid eulittoral bedrock, boulders or cobbles subject to variable salinity characterised by an impoverished community dominated by a mixture of the wracks Ascophyllum nodosum and Fucus vesiculosus. Underneath the canopy are a few green seaweeds including Enteromorpha intestinalis and Cladophora spp., while the red seaweed Polysiphonia lanosa can be found as an epiphyte on A. nodosum. On the rock and among the boulders are the winkles Littorina littorea and Littorina saxatilis, the crab Carcinus maenas, the barnacles Semibalanus balanoides and Elminius modestus and even the occasional mussel Mytilus edulis. Among the seaweeds and underneath the boulders a variety of gammarids can be found.
Situation: This biotope usually lies below the Fucus spiralis biotope (unit A1.322) or the Fucus ceranoides dominated biotopes (A1.327) and above the variable salinity F. serratus dominated biotope (A1.326), although on some shores a narrow zone of F. vesiculosus (A1.313) may occur immediately above the A. nodosum. With increasing wave exposure the A. nodosum canopy can be more dense (A1.3141).
Temporal variation: A. nodosum can reach an age of 25 years and the communities are usually stable. F. vesiculosus or F. serratus can occur in patches where the A. nodosum has been removed.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A1.324

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Ascophyllum nodosum
Invertebrates Carcinus maenas
Invertebrates Elminius modestus
Algae Enteromorpha intestinalis
Algae Fucus ceranoides
Algae Fucus spiralis
Algae Fucus vesiculosus
Invertebrates Littorina littorea
Invertebrates Littorina saxatilis
Invertebrates Mytilus edulis
Algae Polysiphonia lanosa
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Ascophyllum nodosum Algae
Carcinus maenas Invertebrates
Elminius modestus Invertebrates
Enteromorpha intestinalis Algae
Fucus ceranoides Algae
Fucus spiralis Algae
Fucus vesiculosus Algae
Littorina littorea Invertebrates
Littorina saxatilis Invertebrates
Mytilus edulis Invertebrates
Polysiphonia lanosa Algae
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.LLR.FVS.AscVS <I>Ascophyllum nodosum</I> and <I>Fucus vesiculosus</I> on variable salinity mid 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 A1.324 Ascophyllum nodosum and Fucus vesiculosus on variable salinity mid eulittoral rock same
EUNIS Habitat Classification 200308 A1.3143 Ascophyllum nodosum and Fucus vesiculosus on variable salinity mid eulittoral rock same
EUNIS Habitat Classification 200202 A1.3143 Ascophyllum nodosum and Fucus vesiculosus on variable salinity mid eulittoral rock same
EUNIS Habitat Classification 199910 A1.3143 Ascophyllum nodosum and Fucus vesiculosus on variable salinity mid eulittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) SLR.F.Asc.VS Ascophyllum nodosum and Fucus vesiculosus on variable salinity mid eulittoral rock same
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