Ascophyllum nodosum on mid eulittoral mixed substrata
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Very sheltered mixed substrata (cobbles, boulders and pebbles on sediment) in full or near fully marine conditions may be characterised by an Ascophyllum nodosum canopy. Like the Ascophyllum community that occurs on bedrock (Asc), Fucus vesiculosus may be co-dominant. In addition, however, this community also contains a selection of infaunal species, such as Arenicola marina, which occur in the sediment between the cobbles. Large mussels Mytilus edulis commonly occur in clumps, and provide further suitable substrata for the attachment of fucoids and barnacles. Littorina littorea is the most commonly occurring littorinid, and at some sites it may reach high densities. The spaces between cobbles and boulders provide a refuge for crustaceans, especially Carcinus maenas. On shores with a smaller proportion of cobbles and boulders, the large Ascophyllum nodosum plants become uncommon (presumably since they lack a suitable substrata for attachment) and Fucus vesiculosus dominates the canopy (FvesX). F. vesiculosus also tends to replace Ascophyllum in areas with greater freshwater influence.|
|Has Current Version||1|
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