2. Données et outils
  3. Rechercher un habitat
  4. MA1-272 - Pellicules d'algues vertes sur parois et plafond des grottes de la partie supérieure et moyenne du rivage
  5. Description
MA1-272 - Pellicules d'algues vertes sur parois et plafond des grottes de la partie supérieure et moyenne du rivage

Green algal films on upper and mid-shore cave walls and ceilings
MA1-271 - Chrysophycées et haptophycées sur roche tendre des falaises de la frange littorale supérieure
MA1-273 - Encroûtements de Rhodochorton purpureum (anciennement Audouinella purpurea) et de Pleurocladia lacustris (anciennement Pilinia maritima) sur parois et plafond des grottes de la partie supérieure et moyenne du rivage

Classification des habitats EUNIS 2022

Descriptif de l'habitat

The upper walls and ceilings of upper and mid-shore hard and soft rock (chalk) dominated by a band of green algal films (or 'stains'). Other encrusting algae including the non-calcified Hildenbrandia rubra may be present. In chalk caves, on the east and south-east coasts of England, a distinctive assemblage of species occurs, including the brown alga Pilinia maritima and the bright green algae Pseudendoclonium submarinum and Entocladia perforans that often covers the cave ceilings. Fauna is generally sparse and limited to limpets such as Patella vulgata and the winkle Littorina saxatilis. The species forming a green algal film that covers upper shore caves in Berwickshire were not identified. More information required to validate this biotope description.
Situation: This biotope is situated above the zones of units MA1-274 or MA1-275, extending to cover the upper walls and ceilings of caves. This unit can be found at the entrances to caves and through to the darkest areas at the back and is often found above a zone of MA1-273. In hard rock caves however, the green and brown algae (MA1-273) or Haptophyceae (MA1-271) occur as separate zones or MA1-272 may occur on its own.

Bibliographie

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