Laminaria hyperborea forest, foliose red seaweeds and a diverse fauna on tide-swept upper infralittoral rock
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Moderately exposed, tide-swept, rock with dense Laminaria hyperborea forest is characterised by a rich under-storey and stipe flora of foliose seaweeds such as Plocamium cartilagineum, Callophyllis laciniata, Heterosiphonia plumosa, Cryptopleura ramosa and Delesseria sanguinea and crustose algae. Although these species are also found in most kelp forests, in this biotope they are particularly dense. On the rock surface, a rich fauna comprising sponges, anemones (such as Alcyonium digitatum, Sagartia elegans and Urticina felina), hydroids, colonial ascidians and bryozoans. At some sites, instead of being covered by red algae, the kelp stipes may be heavily epiphytised by the sponge Halichondria panicea or the bryozoan Alcyonidium diaphanum. From some areas (such as Orkney), particularly good examples of this biotope may contain maerl and / or rhodoliths, with associated fauna between boulders. Both the flora and fauna of this biotope can be similar to the wave-exposed kelp forest (EIR.LhypFa) and although MIR.Lhyp.TFt is likely to contain species that are unable to tolerate strong wave action, further data analysis is required to clarify the differences. An example of this biotope was found in Lashy Sound in Orkney where Laminaria digitata dominated the tide-swept rock due to the very strong tides and/or non-laminar flow of water.|
|Has Current Version||1|
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