2. Données et outils
  3. Rechercher un habitat
  4. MB1-2153 - Forêt mixte de Laminaria hyperborea et Laminaria ochroleuca sur roche exposée de l'infralittoral en Atlantique
  5. Description
MB1-2153 - Forêt mixte de Laminaria hyperborea et Laminaria ochroleuca sur roche exposée de l'infralittoral en Atlantique

Mixed Laminaria hyperborea and Laminaria ochroleuca forest on exposed Atlantic infralittoral rock
MB1-2152 - Zone clairsemée de Laminaria hyperborea et algues rouges foliacées sur roche exposée de l'infralittoral inférieur en Atlantique

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Mixed Laminaria hyperborea and Laminaria ochroleuca forests on upper infralittoral exposed rock with a dense community of foliose red seaweeds such as Cryptopleura ramosa, and Plocamium cartilagineum as well as small filamentous red seaweeds including Bonnemaisonia asparagoides, Heterosiphonia plumosa, Pterosiphonia parasitica and Brongniartella byssoides. L. hyperborea has a rough stipe which allow dense assemblages of epiphytic red seaweeds to form including the foliose Callophyllis laciniata, Delesseria sanguinea and Hypoglossum hypoglossoides. Unlike L. hyperborea, however, L. ochroleuca has a smooth stipe and so it lacks dense assemblages of epiphytic seaweeds L. ochroleuca has a smooth stipe. Encrusting coralline algae often cover much of the rock surface along with a few brown seaweeds including Dictyota dichotoma, Dictyopteris polypodioides and Desmarestia aculeata present as well. In mixed kelp forest L. ochroleuca may predominate with L. hyperborea more common at shallower depths. Whilst foliose red seaweeds dominate the upward-facing rock beneath the kelp canopy, much of the fauna is restricted to crevices or vertical faces, possibly due to grazing pressure. Echinoderms are often common in this biotope, in particular the sea urchin Echinus esculentus and the starfish Asterias rubens and Marthasterias glacialis. Verticals are colonised by anthozoans including the anthozoans Corynactis viridis, Caryophyllia smithii, Actinothoe sphyrodeta and Alcyonium digitatum, while the bryozoan Membranipora membranacea colonise the Laminaria sp. fronds. This biotope is restricted to the coast of Cornwall and the Isles of Scilly. L. ochroleuca occurs at low abundance in other kelp biotopes (sheltered through to exposed) from Dorset to Lundy Island. In such cases, records should be treated as regional variations of these biotopes. Records should only be assigned to this unit when the canopy is dominated by L. ochroleuca alone, or (more usually) by a mixture of both L. hyperborea and L. ochroleuca (at similar abundance). Both this biotope and unit MB1-238 are common on the Brittany and Normandy coasts of France.
Situation: Since L. ochroleuca is less tolerant of wave action than L. hyperborea this biotope commonly occurs below exposed kelp forests (unit MB1-2151). On occasion it is found below Alaria esculenta in the sublittoral fringe (units MB1-2111 or MB1-2112). At some sites a band of dense foliose seaweeds, with no kelp, occurs below the kelp forest (MB1-221 or MB1-2211) whilst at other sites L. hyperborea kelp park occurs below (MB1-2152).

Bibliographie

European Topic Centre on Biological Diversity 2022. EUNIS marine habitat classification 2022 including crosswalks. Table Excel. (Source)