Fucus vesiculosus on mid eulittoral mixed substrata
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Sheltered and very sheltered mid eulittoral pebbles and cobbles lying on sediment are typically characterised by Fucus vesiculosus. FvesX is usually subject to some variability in salinity from riverine input or, in more marine conditions, the habitat consists predominantly of smaller stones which are too unstable for Ascophyllum nodosum to colonise to any great extent (compare with AscX). This biotope typically differs from Fves in having a less dense canopy and reduced richness of epifaunal species, presumably as a result of the increased siltation, variable salinity and lack of stable substrata. In addition, the sediment between patches of hard substrata often contains the lugworm Arenicola marina, cockles Cerastoderma edule or the ragworm Hediste diversicolor. Littorinids, particularly Littorina littorea, commonly graze on the algae. Ephemeral algae such as Enteromorpha spp. are often present, especially on any more mobile pebbles during the summer. Limpets are less common than in AscX, because of the limited availability of larger rocks.|
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