MB2-52 - Biocénose de Posidonia oceanica

Biocenosis of Posidonia oceanica

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Posidonia oceanica (Linnaeus) Delile is a marine angiosperm, endemic to the Mediterranean. It forms characteristic formations called ‘meadows’ between the surface and 30 to 40 meters down. The plant’s structure shows an epigeous part, corresponding to foliar fascicles (average 30-80 cm in height) and an endogenous part, a veritable underwater terrace: the matte. This matte, composed of a tangle of rhizomes, roots and the sediment that fills in the interstices, and is specific to Posidonia oceanica meadows, presents a vertical growth that can reach 1 meter a century. These meadows, true underwater prairies, represent one of the main Mediterranean climaxes.

Bibliographie

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