N1-H - Pannes dunaires mouilleuses et humides de l'Atlantique et de la Baltique

Atlantic and Baltic moist and wet dune slack

Classification des habitats EUNIS 2022

Descriptif de l'habitat

Dune slacks develop in Atlantic and Baltic dune systems as moist-wet depressions between dune ridges. Primary slacks originate from the development of the beach-dune-slack-system, while secondary slacks occur where blow-outs have lowered the sand level of dune systems to that of groundwater or, unusually in the Wadden Sea, where parts of barrier islands are occasionally flooded by tidal inundation (so-called “green beaches”). The water table fluctuates seasonally, less so around the Baltic, and the mean wetness of slacks can vary so that the range of vegetation is considerable from dwarf rush and bryophyte pioneer vegetation, through wet grasslands, to various kinds of mire and swamp, with persistent areas of open water with aquatic plants.

Espèces diagnostiques

Salix repens, Hydrocotyle vulgaris

Espèces constantes

Agrostis stolonifera, Holcus lanatus, Salix repens, Phragmites australis, Festuca rubra aggr., Trifolium repens, Hydrocotyle vulgaris, Mentha aquatica, Carex flacca, Calliergonella cuspidata, Carex nigra, Lotus corniculatus, Juncus articulatus, Carex arenaria, Ranunculus repens, Argentina anserina, Plantago lanceolata, Galium palustre aggr., Anthoxanthum odoratum aggr., Prunella vulgaris

Espèces dominantes

Salix repens, Agrostis stolonifera, Phragmites australis, Festuca rubra aggr., Calliergonella cuspidata

Bibliographie

 European Topic Centre on Biological Diversity, 2021. EUNIS terrestrial habitat classification 2021 including crosswalks. ETC/BD-EEA. Table Excel transmise par S. Hennekens (Alterra) le 14/02/2022. (Source)