Barnacles, Patella spp. and Fucus vesiculosus f. linearis on exposed eulittoral rock
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Very exposed and exposed upper and mid eulittoral bedrock characterised by dense barnacles, predominantly Chthamalus spp. (regionally abundant in the south and west) and the non- vesiculate form linearis of Fucus vesiculosus. This fucoid forms tufts on the bedrock (frequent or above) and may occupy up to 50% of the rock on some shores. With decreasing wave exposure the normal vesiculate form of Fucus vesiculosus is able to survive and this alga gradually replaces the Barnacle and Patella biotope (see FvesB). BPat.Fvesl is characterised by typically exposed-shore species such as the small littorinid Littorina neritoides, which frequently occurs in empty barnacle tests and a variety of sparse red algae, particularly Porphyra umbilicalis.
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