2. Données et outils
  3. Rechercher un habitat
  4. MA5-253 - Hediste diversicolor, Macoma balthica et Eteone longa dans du sable vaseux médiolittoral en Atlantique
  5. Description
MA5-253 - Hediste diversicolor, Macoma balthica et Eteone longa dans du sable vaseux médiolittoral en Atlantique

Hediste diversicolor, Limecola balthica and Eteone longa in Atlantic littoral muddy sand
MA5-252 - Cerastoderma edule et polychètes dans du sable vaseux médiolittoral en Atlantique
MA5-254 - Bathyporeia pilosa et Corophium arenarium dans du sable vaseux médiolittoral en Atlantique

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Fine to very fine muddy sand on the mid shore at the lower extreme of estuaries, and in moderately exposed and sheltered bays and marine inlets, sometimes subject to variable salinity. The infauna is characterised by the polychaetes Eteone longa, Hediste diversicolor (ragworm) and Pygospio elegans, oligochaetes (mostly Tubificoides benedii and T. pseudogaster), the crustaceans Corophium volutator and Crangon crangon, the spire shell Hydrobia ulvae and the baltic tellin Limecola balthica (Macoma balthica). The cockle Cerastoderma edule may be abundant, and the sand gaper Mya arenaria may be superabundant, though these species are not always present, or may be missed in core samples due to their large size. The polychaetes Arenicola marina, Polydora cornuta and Capitella capitata, the shrimp Crangon crangon, and the Mussel Mytilus edulis are sometimes present.
Situation: This unit can occur on the mid shore of sheltered, lower estuaries, with the MA6-22 communities in muddier sediments on the lower shore. Under moderately exposed conditions in lower estuaries and towards open coasts, it may occur alongside other muddy sand units such as MA5-252 or MA5-254.
Temporal variation: Enteromorpha spp. or Ulva lactuca may form mats on the surface of the sediment during the summer months, particularly in areas of freshwater influence and/or where there is nutrient enrichment.

Bibliographie

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