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 Fucus spp.(typical form) 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.
Fucus vesiculosus(typical form), F. radicans
Density of unattached Fucus spp. (normal form)
HELCOM 1998:22.7 Muddy bottoms
2.7.2 Sublittoral photic zone
188.8.131.52 Dominated by macrophyte vegetation
A5 Sublittoral sediment
A5.5 Sublittoral macrophyte-dominated sediment
Click here to go back to HUB classification