Semibalanus balanoides on exposed or moderately exposed, or vertical sheltered, eulittoral rock
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Exposed to moderately exposed eulittoral bedrock and boulders characterised by dense barnacles Semibalanus balanoides and the limpet Patella vulgata. In the north-west, where Chthamalus spp. also occur, Semibalanus balanoides may form a grey band below the distinct white band of Chthamalus spp. (BPat.Cht) in which patches of Lichina pygmaea may be prominent On some shores, particularly in the south, the Lichina may form a distinct zone (see BPat.Lic). On the east coast, where there is no Chthamalus spp. Lichina, if present, tends to form a band astride the upper limit of the barnacles (i.e. partly in BPat and partly in Ver.B). Cracks and crevices in the rock provide a refuge for small mussels Mytilus edulis, winkles Littorina neglecta and the dog whelk Nucella lapillus. Damp crevices are also frequently occupied by red algae, particularly Osmundea pinnatifida, Mastocarpus stellatus and encrusting coralline algae. With decreasing wave exposure Fucus vesiculosus is able to survive, gradually replacing the barnacles and Patella biotope (see FvesB). BPat.Sem may also occur on steep and vertical faces on sheltered shores, while fucoids dominate the flatter areas.|
|Has Current Version||1|
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