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Biotopes & milieux

Biotope - Typologie Européenne EUNIS

A3.21 - Niveau 4 : Laminaires et algues rouges sur roche infralittorale sous hydrodynamisme modéré
Description
Infralittoral rock subject to moderate wave exposure, or moderately strong tidal streams on more sheltered coasts. On bedrock and stable boulders there is typically a narrow band of kelp Laminaria digitata in the sublittoral fringe which lies above a Laminaria hyperborea forest and park. Associated with the kelp are communities of seaweeds, predominantly reds and including a greater variety of more delicate filamentous types than found on more exposed coasts (A3.11). The faunal component of the understorey is also less prominant than in A3.11.
Taxons (Liens actifs si espèces présentes)
Callophyllis laciniata (Hudson) Kütz., 1843, Chondrus crispus Stackh., 1797, Corallina officinalis L., 1758, Corallinaceae Lamouroux, 1812, Cryptopleura ramosa (Hudson) L.Newton, 1931, Delesseria sanguinea (Hudson) J.V.Lamour., 1813, Dilsea carnosa (Schmidel) Kuntze, 1898, Hypoglossum hypoglossoides (Stackh.) F.S.Collins & Hervey, 1917, Membranoptera alata (Hudson) Stackh., 1809, Palmaria palmata (L.) Weber & Mohr, 1805, Phycodrys rubens (L.) Batters, 1902, Plocamium cartilagineum (L.) P.S.Dixon, 1967,
A3.217 - Niveau 5 : Hiatella arctica et algues sur paroi verticale de calcaire ou de craie
Description
This biotope is found in the infralittoral zone on moderately exposed vertical limestone/chalk surfaces in weak tidal streams, and has been recorded most frequently between 0-10m. This biotope is characterised by abundant Hiatella arctica and a rich sponge community including Cliona celata, Dysidea fragilis and Pachymatisma johnstonia. Other species that may be frequent in this biotope are the crab Necora puber, the sea squirt Clavelina lepadiformis, and the top shell Calliostoma zizyphinum, although these species are found in other vertical rock biotopes, however in lesser abundance. Situation: Shallow rocky coasts with vertical limestone faces.
Taxons (Liens actifs si espèces présentes)
Brongniartella byssoides (Goodenough & Woodward) F.Schmitz, 1893 ( Esp. caract. )
Bugula sp. ( Esp. caract. )
Corallinaceae Lamouroux, 1812 ( Esp. caract. )
Cryptopleura ramosa (Hudson) L.Newton, 1931 ( Esp. caract. )
Didemnidae sp. ( Esp. caract. )
Hydrozoa sp. ( Esp. caract. )
Phyllophora crispa (Hudson) P.S.Dixon, 1964 ( Esp. caract. )
Polychaeta sp. ( Esp. caract. )
Analyse Ecologie du milieu (En fonction des espèces présentes)