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 Furcellaria lumbricalis constitutes at least 50 % of the biovolume.
range: >4.5 psu; Exposure range: low to moderately high; Depth range: photic
zone from about 2 to 5 meters and deeper in clear waters.
Lower limit of Furcellaria belt, amount of epiphytic algae, density of Furcellaria
Sea up to the Quark in the north and central Gulf of Finland in the east
HELCOM 1998:2.7 Muddy bottoms2.7.2 Sublittoral photic zone18.104.22.168 Dominated by macrophyte vegetation
EUNIS 2012:A5 Sublittoral sedimentA5.5 Sublittoral macrophyte-dominated sediment
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