Laminaria digitata, ascidians and bryozoans on tide-swept sublittoral fringe rock
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Very sheltered bedrock, boulders and cobbles that are subject to moderate to strong tidal water movement characterised by dense Laminaria digitata, ascidians and bryozoans. Species richness is generally greater than in the non tide-swept L. digitata biotope (MIR.Ldig.Ldig), with a greater abundance and wider range of foliose red seaweeds. The increased water movement encourages several filter-feeding faunal groups to occur. The sponges Leucosolenia spp., Halichondria panicea and Hymeniacidon perleve frequently occur on steep and overhanging faces. In addition, the ascidians Ascidia conchilega, Dendrodoa grossularia and colonial ascidians are also found. Areas where increased tidal movement influences such a community are in the narrows and/or intertidal sills of sealochs. This biotope may be found immediately below the tide-swept Fucus serratus biotope (SLR.Fserr.T). The sublittoral fringe of similarly sheltered shores that are not tide-swept are generally characterised by mixed L. saccharina and L. digitata (SIR.Lsac.Ldig) or L. saccharina (SIR.Lsac).|
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