Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools
Shallow and relatively small rockpools throughout the eulittoral zone on very exposed to exposed shores, characterised by a covering of encrusting coralline algae on which Corallina officinalis forms a dense turf. The bottom of these pools can be covered in coarse gravel and cobbles. In south and west Ireland these coralline pools may be dominated by the sea urchin Paracentrotus lividus and the seaweed diversity is generally low due to the grazing pressure of P. lividus, the top shells Gibbula cineraria and Gibbula umbilicalis, and winkles such as Littorina littorea. Within the pools, pits and crevices are often occupied by the anemone such as Actinia equina and Anemonia viridis and small individuals of the mussel Mytilus edulis. The siphonous green seaweed Codium spp. can also be present along with the wrack Himanthalia elongata and the brown seaweed Leathesia difformis and the filamentous red seaweed Ceramium spp. The barnacle Semibalanus balanoides is either absent or occurs at low abundance in these rockpools, presumably due to the grazing pressure on the larval stage and the predation pressure from the whelk Nucella lapillus. Soft bedrock, such as limestone, allows P. lividus to bore into the rock.
Situation: Rockpools throughout the eulittoral and lower littoral fringe in bedrock on very exposed to exposed shores.
Temporal variation: The ephemeral green seaweeds Enteromorpha intestinalis and Ulva lactuca can occur during the summer.
Source: EUNIS habitat classification
|EUNIS habitat type||code MA12622|
|Relation to||Resolution 4 habitat type (used for designation of Emerald sites)|
Relation to other habitat types mentioned in legal instruments
Relation to vegetation types (syntaxa)Not available
Species mentioned in habitat description
|Species scientific name||English common name||Species group|
|Nucella lapillus||Dog whelk||Invertebrates|
|Classification||Code||Habitat type name||Relationship type|
|EUNIS Habitat Classification 2007 (revised descriptions 2012)||A1.4112||Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools||same|
|Classification||Code||Habitat type name||Relationship type||Comment|
|EUNIS Habitat Classification 200410||A1.4112||Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools||same|
|EUNIS Habitat Classification 200308||A1.5111||Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools||same|
|EUNIS Habitat Classification 200202||A1.5111||Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools||same|
|EUNIS Habitat Classification 199910||A1.5111||Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools||same|
|MNCR BioMar 97.06 (Britain & Ireland)||LR.Rkp.Cor.Par||Coralline crusts and Paracentrotus lividus in shallow eulittoral rockpools||same|