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). Annual algae cover at least 10 % of the seabed, while all other vegetation covers less than 10 %. Of the annual algae, Vaucheria spp. constitutes at least 50 % of the biovolume.
range: <7 psu; Exposure range: sheltered; Depth range: photic zone down to
about 7 meters.
southern Baltic Sea to northern Bothnian Bay and eastern Gulf of Finland
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
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