Biodiversity & Conservation

Ascophyllum nodosum on very sheltered mid eulittoral rock.


<i>%Ascophyllum nodosum%</i> on very sheltered mid eulittoral rock.
Distribution map

LR.SLR.F.Asc 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 The SLR.Asc biotope, and the sub-biotopes, SLR.Asc.Asc, SLR.Asc.T and SLR.Asc.VS are recorded from most British and Irish coasts.
National importance Widespread

Text page icon Description of biotope

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

Sheltered to very sheltered mid eulittoral rock with the knotted wrack Ascophyllum nodosum. Several variants of this biotope are described. These are: full salinity (SLR.Asc.Asc), tide-swept (SLR.Asc.T) and variable salinity (SLR.Asc.VS). (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:

Hill, J.M. 2001. Ascophyllum nodosum on very sheltered mid eulittoral rock.. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 25/11/2015]. Available from: <>