Fucus serratus and large Mytilus edulis on variable salinity lower eulittoral rock
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Areas of very sheltered lower eulittoral bedrock and stable boulders that are influenced by freshwater, such as towards the heads of sealochs and in estuaries, may support an impoverished community dominated by Fucus serratus and clumps of large Mytilus edulis. This biotope may be found below the variable salinity Ascophyllum nodosum biotope (Asc.VS), particularly in Scottish sealochs. The canopy of F. serratus is usually less dense (typically common) than in the other F. serratus biotopes (Fser.Fser and Fserr.T). Sponges, hydroids and the polychaetes Pomatoceros triqueter and Spirorbis spp. are generally rare or absent. In areas (such as the Scottish sealochs) where variable salinity water passes through tide-swept narrows and the associated biota is impoverished such records should be classified as Fserr.VS rather than Fserr.T.|
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