Semibalanus balanoides and Littorinaspp. on exposed to moderately exposed eulittoral boulders and cobbles
Quick facts
EUNIS habitat type | code MA12233 |
---|---|
Relation to | Resolution 4 habitat type (used for designation of Emerald sites) |
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 (MA1-2131or MA1-2132) and/or below the Chthamalus spp. and P. vulgata biotope (MA1-222). Below this biotope the Himanthalia elongata dominated biotopes may occur (MA1-232; MA1-233). On less exposed shores it can be found above the Fucus serratus biotope on boulders (MA1-2442).
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
Legal status
Relation to other habitat types mentioned in legal instruments
Vegetation types
Relation to vegetation types (syntaxa)
Not availableSpecies mentioned in habitat description
Species scientific name | English common name | Species group |
---|---|---|
Enteromorpha intestinalis | Algae | |
Fucus serratus | Algae | |
Fucus vesiculosus | Algae | |
Actinia equina | Invertebrates | |
Carcinus maenas | Invertebrates | |
Mytilus edulis | Invertebrates | |
Nucella lapillus | Dog whelk | Invertebrates |
Patella vulgata | Invertebrates |
Other classifications
Classification | Code | Habitat type name | Relationship type |
---|---|---|---|
EUNIS Habitat Classification 2007 (revised descriptions 2012) | A1.1133 | Semibalanus balanoides and Littorina spp. on exposed to moderately exposed eulittoral boulders and cobbles | same |
History
Classification | Code | Habitat type name | Relationship type | Comment |
---|---|---|---|---|
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 |