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LR.FLR.Eph Ephemeral green or red seaweed communities (freshwater or sand-influenced)

Published date 2015-03

Ephemeral seaweeds on disturbed littoral rock in the lower to upper shore. Dominant green seaweeds include Ulva intestinalis, Ulva lactuca and the red seaweeds Rhodothamniella floridula and Porphyra p...


SS.SMp.SSgr.Rup Ruppia maritima in reduced salinity infralittoral muddy sand

Published date 2015-03

In sheltered brackish muddy sand and mud, beds of Ruppia maritima and more rarely Ruppia spiralis may occur. These beds may be populated by fish such as Gasterosteus aculeatus which is less common on ...


LR.HLR.MusB.Sem.LitX Semibalanus balanoides and Littorina spp. on exposed to moderately exposed eulittoral boulders and cobbles

Published date 2015-03

Large patches of boulders, cobbles and pebbles in the eulittoral zone on exposed to moderately exposed shores colonised by the barnacle Semibalanus balanoides and, on larger rocks, the limpet Patella ...


CR Circalittoral rock (and other hard substrata)

Published date 2015-03

Circalittoral rock is present all around the coast of the United Kingdom, and is characterised by animal dominated communities (a departure from the algae dominated communities in the infralittoral zo...


SS.SBR.SMus.MytSS Mytilus edulis beds on sublittoral sediment

Published date 2015-03

Shallow sublittoral mixed sediment, in fully marine coastal habitats or sometimes in variable salinity conditions in the outer regions of estuaries, are characterised by beds of the common mussel Myti...


SS.SSa.SSaLS Sublittoral sand in low or reduced salinity (lagoons)

Published date 2015-03

Shallow sand and muddy sand in areas of low or reduced, although relatively stable salinity (may vary annually), with largely ephemeral faunal communities. The species are often similar to that found ...


SS.SMu.OMu.ForThy Foraminiferans and Thyasira sp. in deep circalittoral fine mud

Published date 2015-03

In deep water and soft muds of Boreal and Arctic areas, a community dominated by foraminiferans and the bivalve Thyasira sp. (e.g. T. croulinensis and T. pygmaea) may occur (Thorson 1957; Künitzer et...


SS.SMp.Mrl Maerl beds

Published date 2015-03

Beds of maerl in coarse clean sediments of gravels and clean sands, which occur either on the open coast or in tide-swept channels of marine inlets (the latter often stony). In fully marine conditions...


IR.FIR.SG.CC.BalSpi Balanus crenatus and/or Spirobranchus triqueter with spirorbid worms and coralline crusts on severely-scoured vertical infralittoral rock

Published date 2015-03

Severely scoured bedrock in wave-surged caves, tunnels or gullies often looks rather bare, and may be characterised by a limited scour-tolerant fauna of Balanus crenatus and/or Spirobranchus triqueter...


SS.SMx.IMx.CreAsAn Crepidula fornicata with ascidians and anemones on infralittoral coarse mixed sediment

Published date 2015-03

Medium-coarse sands with gravel, shells, pebbles and cobbles on moderately exposed coasts may support populations of the slipper limpet Crepidula fornicata with ascidians and anemones. C. fornicata is...



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