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

Audouinella purpurea and Pilinia maritima crusts on upper and mid-shore cave walls and ceilings

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Golden brown velvety growths of the brown algae Pilinia maritima occurring in mats with the red alga Audouinella purpurea forming on cave walls and upper littoral levels of cliffs. Fauna is sparse and limited to occasional individuals of the winkle Littorina saxatilis and spirorbid polychaetes. This assemblage is thought to be is widespread throughout Britain, although there are currently few records available. More information are needed to validate this description, which is based on information from the Thanet intertidal survey (Tittley & Spurrier 2001).
Situation: This biotope is found at the entrances and the inner reaches of caves between a band of unit MA1-274 and the MA1-272 zone above.
Temporal variation: Some variation in the species composition of the individual caves must be expected depending on local conditions.

Bibliographie

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