Ascophyllum nodosum on full salinity mid eulittoral mixed substrata

English name: Ascophyllum nodosum on full salinity mid eulittoral mixed substrata

Quick facts

EUNIS habitat type code A1.3142

Description (English)

Sheltered to extremely sheltered full salinity mixed substrata (cobbles, boulders and pebbles on sediment) characterised by a canopy formed by a mosaic of the wracks Ascophyllum nodosum and Fucus vesiculosus. The red seaweed Polysiphonia lanosa can often be found as an epiphyte on the A. nodosum. The mussel Mytilus edulis often occurs in clumps, and provides further suitable substrata for the attachment of fucoids and red and green seaweeds such as Polysiphonia spp. and Enteromorpha intestinalis or the barnacle Semibalanus balanoides. Winkles are common and Littorina littorea and Littorina obtusata/mariae may occur in high densities, while species such as the limpet Patella vulgata, the crab Carcinus maenas and the whelk Nucella lapillus may occur on and around the boulders. Gammarids can be found underneath the boulders or among the seaweeds, while tube-forming spirorbids are found on the boulders, shells or on the F. vesiculosus. Infaunal species including the polychaetes Arenicola marina and Lanice conchilega may occur in the sediment between the cobbles.
Situation: A sparse S. balanoides, P. vulgata and L. littorea community (unit A2.431) can occur above this biotope. On shores with a proportion of smaller cobbles and boulders, large A. nodosum plants become uncommon and F. vesiculosus dominates the canopy (A1.3132). F. vesiculosus also tends to replace A. nodosum in areas with freshwater influence. Below this biotope are either a Fucus serratus dominated biotope (A1.3152) or a M. edulis dominated biotope (A1.111).
Temporal variation: A. nodosum communities tend to be stable due to longevity of the individual A. nodosum, but because of the mixed substrata some variation in the densities of F. vesiculosus and A. nodosum can be expected.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Arenicola marina
Algae Ascophyllum nodosum
Invertebrates Carcinus maenas
Algae Enteromorpha intestinalis
Algae Fucus serratus
Algae Fucus vesiculosus
Invertebrates Lanice conchilega
Invertebrates Littorina littorea
Invertebrates Mytilus edulis
Invertebrates Nucella lapillus
Invertebrates Patella vulgata
Algae Polysiphonia lanosa
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Arenicola marina Invertebrates
Ascophyllum nodosum Algae
Carcinus maenas Invertebrates
Enteromorpha intestinalis Algae
Fucus serratus Algae
Fucus vesiculosus Algae
Lanice conchilega Invertebrates
Littorina littorea Invertebrates
Mytilus edulis Invertebrates
Nucella lapillus Dog whelk Invertebrates
Patella vulgata Invertebrates
Polysiphonia lanosa Algae
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.LLR.F.Asc.X <I>Ascophyllum nodosum</I> on full salinity mid eulittoral mixed substrata 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 A1.3142 Ascophyllum nodosum on full salinity mid eulittoral mixed substrata same
EUNIS Habitat Classification 200308 A1.323 Ascophyllum nodosum on full salinity mid eulittoral mixed substrata same
EUNIS Habitat Classification 200202 A1.323 Ascophyllum nodosum on mid eulittoral mixed substrata same
EUNIS Habitat Classification 199910 A1.323 Ascophyllum nodosum on mid eulittoral mixed substrata same
MNCR BioMar 97.06 (Britain & Ireland) SLR.FX.AscX Ascophyllum nodosum on mid eulittoral mixed substrata same
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