HELCOM RED LIST Biotope Expert Team
Baltic bottoms in the photic zone with at least 90 % coverage of muddy sediment. The sediment must contain at least 20 % of mud, silt or clay (grain size less than 63 µm). Emergent vegetation covers least 10 % of the seabed and more than other perennial attached erect groups. Of the emergent vegetation, sedges form at least 50 % in biovolume.
Salinity range: <5 psu; Exposure range: sheltered; Depth range: photic zone down to about 1 meters.
Schoenoplectus spp, Bolbaschoenus maritimus
Whole Baltic Sea
HELCOM 1998: 2.7 Muddy bottoms
2.7.2 Sublittoral photic zone
18.104.22.168 Dominated by macrophyte vegetation
A5 Sublittoral sediment
A5.5 Sublittoral macrophyte-dominated sediment
A5.54 Angiosperm communities in reduced salinity
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This biotope has been listed as Near Threatened (NT) in the HELCOM Red List of Baltic Sea biotopes and habitats.
See the Biotope Information Sheet of AA.H1A2