Oligotrophic to mesotrophic base poor standing waters of planar to subalpine zones of the Continental and Alpine regions and mountain ranges
Oligotrophic to mesotrophic standing waters hosting amphibious shoreweed communities (Littorelletea) as well as - if waters dry out in late summer - annual dwarf rush communities (Isoëto-Nanojuncetea). These two units can grow together in close association or separately. This habitat type also includes oligotrophic, muddy, ephemeral ox-bows and pond shores. Characteristic plant species are generally ephemerophytes and small (mostly < 10 cm) plants.
The European Commission has clarified that - depending on the definition of the term 'natural' - this habitat type may be primary or secondary (e.g. ponds) if its occurrences are subject to (semi-)natural development.
Notes on habitat mapping
The criterion for the delimitation of this habitat type is the presence of vegetation of the Isoëto-Nanojuncetea class or of the orders Hydrocotylo-Baldellion, Deschampsion litoralis or Eleocharition acicularis in oligotrophic to mesotrophic standing waters. In addition to the vegetation given above this habitat is further characterized by the prevailing oligotrophic to mesotrophic conditions. Similar vegetation occurring in dune slacks should be assigned to the habitat type 2190 with its sub-types.
The entire waterbody in or along which vegetation of the syntaxa given above has been recorded is to be included. Apart from the open water the amphibious zone with its reedbeds, tall herb fringe communities, and sedge swamps is to be included.
Stands of the plant communities given above which occur outside of oligotrophic or mesotrophic waters are excluded.
Correct title: 'Mesotrophic waters of Central European and perialpine regions, with occasionally emergent shorelines; with amphibious/submerse shoreweed communities (Littorelletea) and/or annual dwarf rush communities (Isoëto-Nanojuncetea)'.