Mixed Laminaria hyperborea and Laminaria ochroleuca forest on exposed infralittoral rock
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Mixed Laminaria hyperborea and Laminaria ochroleuca forests on upper infralittoral exposed rock are restricted to the coast of Cornwall and the Isles of Scilly. Superficially, the L. ochroleuca biotope looks similar to the more widespread exposed Laminaria hyperborea forest (EIR.LhypR.Ft), containing a similar suite of foliose red algae (such as Phycodrys rubens, Plocamium cartilagineum, Callophyllis laciniata and Delesseria sanguinea) beneath the canopy. Unlike L. hyperborea, however, L. ochroleuca has a smooth stipe and so it lacks dense assemblages of epiphytic seaweeds, though some Palmaria palmata may occur. This biotope commonly occurs below EIR.LhypR.Ft, since L. ochroleuca is less tolerant of wave action than L. hyperborea. L. ochroleuca occurs at low abundances in other kelp biotopes (sheltered through to exposed) from Dorset to Lundy Island. In such cases, records should be treated as regional variations of the usual kelp biotope. Records should only be assigned to this biotope when the canopy is dominated by L. ochroleuca alone, or (more usually) by a mixture of both L. hyperborea and L. ochroleuca (at similar abundances). This biotope is similar to the mixed L. hyperborea and L. ochroleuca biotope found on moderate and sheltered coasts (MIR.Lhyp.Loch), though the latter generally occurs in shallower water and has a lower density of L. hyperborea, fewer foliose and more filamentous red algae. Both L. ochroleuca biotopes are common on the Brittany and Normandy coasts.|
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