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Marine Habitat Classification


1 result for 'LS.LBR.LMus.Myt.Mx'

   LS.LBR.LMus.Myt.Mx  Mytilus edulis beds on littoral mixed substrata

Mid and lower shore mixed substrata (mainly cobbles and pebbles on fine sediments) in a wide range of exposure conditions and with aggregations of the mussel Mytilus edulis colonising mainly the sediment between cobbles, though they can extend onto the cobbles themselves. The mussel aggregations can be very dense and support various age classes. In high densities the mussels bind the substratum and provide a habitat for many infaunal and epifaunal species. The wrack Fucus vesiculosus is often found attached to either the mussels or the cobbles and it can occur at high abundance. The mussels are also usually encrusted with the barnacles Semibalanus balanoides, Austrominius modestus or Chtamalus spp., especially in areas of reduced salinity. The winkles Littorina littorea and L. saxatilis and small individuals of the crab Carcinus maenas are common amongst the mussels, whilst areas of sediment may contain the lugworm Arenicola marina, the sand mason Lanice conchilega and other infaunal species. Pools are often found within the mussel beds that support algae such as Chondrus crispus. Where boulders are present they can support the limpet Patella vulgata, the dogwhelk Nucella lapillus and the anemone Actinia equina. Ostrea edulis may occur on the lowest part of the shore. There are few infaunal samples for this biotope, hence the characterising species list below shows only epifauna. Where infaunal samples have been collected for this biotope, they contain a highly diverse range of species including nematodes, Phyllodoce mucosa, Hediste diversicolor, Polydora spp., Pygospio elegans, Eteone longa, oligochaetes such as Tubificoides spp., Semibalanus balanoides, a range of gammarid amphipods, Corophium volutator, Jaera forsmani, Crangon crangon, Carcinus maenas, Peringia ulvae and Macoma balthica.
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