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). No perennial attached erect group has a coverage ≥ 10%. Stable aggregations of unattached perennial vegetation cover at least 10 % of the seabed. Out of the unattached perennial vegetation Aegagropila linnaei constitutes at least 50 % of the biovolume.
range: <5 psu; Exposure range: sheltered; Depth range: photic zone to about
HELCOM 1998: 2.7 Muddy bottoms2.7.2 Sublittoral photic zone220.127.116.11 Dominated by macrophyte vegetation
EUNIS 2012:A5 Sublittoral sediment A5.5 Sublittoral macrophyte-dominated sediment
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