Ephemeral green and red seaweeds on variable salinity or disturbed eulittoral mixed substrata
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Eulittoral mixed substrata (pebbles and cobbles overlying sand or mud) that is subject to variations in salinity and / or siltation are often characterised during the summer months by dense blankets of ephemeral green and red algae. The main species present are Enteromorpha spp., Ulva lactuca and Porphyra spp. Although fucoid algae occur in these areas they are typically rare. Small numbers of other species such as barnacles Semibalanus balanoides and Elminius modestus and keel worms Pomatoceros spp. are confined to any larger cobbles and pebbles. This biotope may be a summer variation of BLlit, in which ephemeral algal growth has exceeded the capacity of the grazing molluscs. In common with the other biotopes found on mixed substrata, patches of sediment are typically characterised by infaunal species including bivalves (Cerastoderma edule and Macoma balthica) and polychaetes (Arenicola marina and Lanice conchilega). Occasional clumps of Mytilus edulis may also occur, although at considerably lower density than in MytX.
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