EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A1 - Littoral rock and other hard substrata > A1.1 - High energy littoral rock > A1.11 - Mussel and/or barnacle communities > A1.113 - Semibalanus balanoides on exposed to moderately exposed or vertical sheltered eulittoral rock > A1.1133 - Semibalanus balanoides and Littorina spp. on exposed to moderately exposed eulittoral boulders and cobbles

Semibalanus balanoides and Littorina spp. on exposed to moderately exposed eulittoral boulders and cobbles

English name: Semibalanus balanoides and Littorina spp. on exposed to moderately exposed eulittoral boulders and cobbles

Quick facts

EUNIS habitat type code A1.1133
Bern Convention Included in a Resolution 4 habitat type at a higher level (A1.11)

Description (English)

Large patches of boulders, cobbles and pebbles in the eulittoral zone on exposed to moderately exposed shores colonised by the barnacle Semibalanus balanoides and, on larger rocks, the limpet Patella vulgata. The winkles Littorina littorea and Littorina saxatilis and the whelk Nucella lapillus are typically found in high numbers on and around cobbles and smaller boulders, while the anemone Actinia equina occurs in damp areas between and underneath larger boulders. Between the cobbles and pebbles, the mussel Mytilus edulis occasionally occurs, but always at low abundance, as do the crab Carcinus maenas and gammarid amphipods. Ephemeral green seaweeds such as Enteromorpha intestinalis may cover cobbles and boulders. The foliose red seaweeds Chondrus crispus, Mastocarpus stellatus and Osmundea pinnatifida as well as the wrack Fucus vesiculosus may also occur in low abundance on cobbles and boulders. The top shells Gibbula cineraria and Gibbula umbilicalis can, on more sheltered shores, be found among the seaweeds or underneath the boulders. The barnacle Elminius modestus is present on some shores.
Situation: On exposed shores with large boulders this unit is found below the black lichen Verrucaria maura and sparse barnacles biotope (B3.1131or B3.1132) and/or below the Chthamalus spp. and P. vulgata biotope (A1.112). Below this biotope the Himanthalia elongata dominated biotopes may occur (A1 122; A1.123). On less exposed shores it can be found above the Fucus serratus biotope on boulders (A1.2142).
Temporal variation: Seasonally mobile boulders, cobbles and pebbles are likely to have a sparser coverage of flora and fauna, because the rocks can be subject to turning. Ephemeral green seaweeds can dominate during the summer.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Enteromorpha intestinalis
Algae Fucus serratus
Algae Fucus vesiculosus
Algae Himanthalia elongata
Algae Mastocarpus stellatus
Algae Osmundea pinnatifida
Invertebrates Actinia equina
Invertebrates Carcinus maenas
Invertebrates Elminius modestus
Invertebrates Gibbula cineraria
Invertebrates Gibbula umbilicalis
Invertebrates Littorina littorea
Invertebrates Littorina saxatilis
Invertebrates Mytilus edulis
Invertebrates Nucella lapillus
Invertebrates Patella vulgata
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Enteromorpha intestinalis Algae
Fucus serratus Algae
Fucus vesiculosus Algae
Himanthalia elongata Algae
Mastocarpus stellatus Algae
Osmundea pinnatifida Algae
Actinia equina Invertebrates
Carcinus maenas Invertebrates
Elminius modestus Invertebrates
Gibbula cineraria Invertebrates
Gibbula umbilicalis Invertebrates
Littorina littorea Invertebrates
Littorina saxatilis 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.MusB.Sem.LitX <I>Semibalanus balanoides</I> and <I>Littorina</I> spp. on exposed to moderately exposed eulittoral boulders and cobbles 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 A1.1133 Semibalanus balanoides and Littorina spp. on exposed to moderately exposed eulittoral boulders and cobbles same
EUNIS Habitat Classification 200308 A1.321 Barnacles and Littorina littorea on unstable eulittoral mixed substrata wider
EUNIS Habitat Classification 200202 A1.321 Barnacles and Littorina littorea on unstable eulittoral mixed substrata overlap
EUNIS Habitat Classification 199910 A1.321 Barnacles and Littorina littorea on unstable eulittoral mixed substrata overlap
MNCR BioMar 97.06 (Britain & Ireland) SLR.FX.BLlit Barnacles and Littorina littorea on unstable eulittoral mixed substrata overlap
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100