2. Données et outils
  3. Rechercher un habitat
  4. MA4-232 - Hediste diversicolor dans les sables vaseux et graveleux et les vases sableuses et graveleuses du médiolittoral en Atlantique
  5. Description
MA4-232 - Hediste diversicolor dans les sables vaseux et graveleux et les vases sableuses et graveleuses du médiolittoral en Atlantique

Hediste diversicolor in Atlantic littoral gravelly muddy sand and gravelly sandy mud
MA4-231 - Balanes et Littorina spp. sur substrats hétérogènes instables du médiolittoral en Atlantique
MA4-233 - Cirratulides et Cerastoderma edule dans les sédiments hétérogènes du médiolittoral en Atlantique

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Sheltered gravelly sandy mud, subject to reduced salinity, mainly on the mid and lower shore. The infaunal community is dominated by abundant ragworms Hediste diversicolor. Other species of the infauna vary for the sub-biotopes described. They include polychaetes such as Pygospio elegans, Streblospio shrubsolii, and Manayunkia aestuarina, oligochaetes such as Heterochaeta costata and Tubificoides spp., the mud shrimp Corophium volutator, the spire shell Hydrobia ulvae, the baltic tellin Limecola balthica (Macoma balthica) and the peppery furrow shell Scrobicularia plana. Sub-biotopes described as subunits of this unit have equivalent communities in soft muddy sediments, but the sediment here is much firmer due to the gravel component. There are relatively few records in each sub-type, leading to uncertainty over the precise nature of the habitat, particularly regarding sediment type and salinity regime.
Situation: It is probable that there are broad transition areas between the sub-biotopes of MA4-232and the corresponding muddy sediment biotopes. The boundaries may be very indistinct, with the MA4-232 groups present in patches of gravelly mud on areas of mudflat where the main biotopes are their corresponding mud or sandy mud biotopes. Given the small number of records for each of the sub-biotopes, their spatial distribution is still uncertain.

Bibliographie

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