Biodiversity & Conservation

Filamentous green seaweeds on low salinity infralittoral mixed sediment or rock



Image Anon. - Tufts of green filamentous algae. Image width ca 15 cm.
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Distribution map

SS.IMX.KSwMx.FiG recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)

  • EC_Habitats

Text page icon Habitat description

Map icon Distribution of biotope in Britain and Ireland Recorded in Scottish lagoons and the Isles of Scilly, Cornwall.
National importance Scarce

Text page icon Description of biotope

For a full description of this biotope including characterizing species, distribution, survey information and references visit JNCC

Shallow muddy sediments, often with boulders, cobbles and pebbles around the edges of lagoons that are exposed to wide salinity variations are unsuitable for colonization by many species. Such areas may be colonized by a dense blanket of ephemeral green algae such as Ulva spp., Chaetomorpha linum, Cladophora liniformis or Derbesia marina. This biotope may also contain some red seaweeds, such as Furcellaria lumbricalis, but always at low abundance (compare with SIR.PolFur). Amongst the filamentous green algae, grazing molluscs and solitary ascidians may be present. (Information taken from the Marine Biotope Classification for Britain and Ireland, Version 97.06: Connor et al., 1997a, b).

Additional information icon Additional information


This review can be cited as follows:

Hiscock, K. 2002. Filamentous green seaweeds on low salinity infralittoral mixed sediment or rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 01/12/2015]. Available from: <>