Mastocarpus stellatus and Chondrus crispus on very exposed to moderately exposed lower eulittoral rock
|EUNIS habitat type||code MA1235|
|Relation to||Resolution 4 habitat type (used for designation of Emerald sites)|
Exposed to moderately exposed lower eulittoral vertical to almost horizontal bedrock characterised by a dense turf of Mastocarpus stellatus and Chondrus crispus (either together or separately). Beneath these foliose seaweeds the rock surface is covered by encrusting coralline algae and the barnacle Semibalanus balanoides, the limpet Patella vulgata and spirorbid polychaetes. Other seaweeds including the red Lomentaria articulata and Osmundea pinnatifida, Palmaria palmata, Corallina officinalis and coralline crusts. The wrack Fucus serratus and the green seaweeds Enteromorpha intestinalis and Ulva lactuca may also be present though usually at a low abundance. Although both M. stellatus and C. crispus are widespread in the lower eulittoral and the sublittoral fringe, they occur only infrequently in a distinct band, or in large enough patches, to justify separation from MA1-2441. Consequently, where only small patches of these species occur within a larger area of mixed red algal turf, then records should be assigned to more general mixed red algal turf biotope (MA1-232; MA1-233). M. stellatus can be present in high abundance in a number of biotopes (MA1-232: MA1-233; MA1-2441 etc.) found on the shore. At least one other species normally co-dominates and records should be assigned to the appropriate biotope. Caution should be taken regarding the characterising species list due to the low number of records. More information needed to validate this description.
Situation: This biotope can form a band above the main kelp zone, above Alaria esculenta (MB1-211) or the mussel Mytilus edulis (MA1-221) or within a F. serratus -red algal mosaic (MA1-2441).
Temporal variation: M. stellatus is more resistant to wave action than C. crispus and may therefore dominate more exposed shores; it can dominate vertical rock at very exposed sites (e.g. Mingulay, Outer Hebrides). On more sheltered shores, especially in the south-west, M. stellatus may give way to C. crispus which has a faster growth rate.
Source: EUNIS habitat classification
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|
|Classification||Code||Habitat type name||Relationship type|
|EUNIS Habitat Classification 2007 (revised descriptions 2012)||A1.125||Mastocarpus stellatus and Chondrus crispus on very exposed to moderately exposed lower eulittoral rock||same|
|Classification||Code||Habitat type name||Relationship type||Comment|
|EUNIS Habitat Classification 200410||A1.125||Mastocarpus stellatus and Chondrus crispus on very exposed to moderately exposed lower eulittoral rock||same|
|EUNIS Habitat Classification 200308||A1.233||same|
|EUNIS Habitat Classification 200202||A1.233||Mastocarpus stellatus and Chondrus crispus on very to moderately exposed lower eulittoral rock||same|
|EUNIS Habitat Classification 199910||A1.223||Mastocarpus stellatus and Chondrus crispus on very to moderately exposed lower eulittoral rock||same|
|MNCR BioMar 97.06 (Britain & Ireland)||MLR.R.Mas||Mastocarpus stellatus and Chondrus crispus on very to moderately exposed lower eulittoral rock||same|