Biocénose des sables grossiers et des graviers fins sous influence des courants de fond en Méditerranée

This habitat is usually found in the Mediterranean between 3-4 meters and 20-25 meters down, but can, locally, go down to 70 meters. It lies thus on two, infra- and circalittoral, stages. It is frequent in channels between islands that are subject to frequent, violent currents, which constitute the main factor on which its existence depends. It is also found in the ‘intermatte’ channels dug out by the currents in the Posidonia meadows. This habitat, strictly subject to bottom currents, can change if the movement of the water is artificially or naturally modified, for example during long periods of calm weather. Its extension downwards, into the circalittoral stage, is linked to particularly intense hydrodynamic phenomena, either directly below rocky shelf-edge banks (the Banc des Blauquières) or in straits (the Bouches de Bonifacio). It may, in these conditions, present qualititative and quantitative modifications in its habitual population. Seasonal variations are marked by differences in the abundance, and the replacement, of species.

Source : Référentiel HABREF v7 (INPN/MNHN)

MB3-52 — Biocénose des sables grossiers et des graviers fins sous influence des courants de fond en Méditerranée est un habitat classé sous la typologie EUNIS 2022, présent en France. Il est un sous-niveau de l’habitat MB3-5 — Sédiment grossier de l'infralittoral en Méditerranée et il est lui-même subdivisé en 2 sous-habitats. Aucune espèce documentée comme inféodée à cet habitat n’est référencée dans la base actuelle.

Source : Ontologia (synthèse)