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).
Salinity range: all; Exposure range: sheltered; Depth range: photic zone
Phanerogams, Charales, mobile epifauna, infauna
Photic zone areas with muddy sediment, such as soft clay, silt or mud.
This includes mixed sediments where clay and/or mud are mixed with sand
Whole Baltic Sea
Silting caused by eutrophication, dredging spoil deposition etc.
HELCOM 1998: 2.7 Muddy bottoms
2.7.2 Sublittoral photic zone
A5 Sublittoral sediment
A5.3 Sublittoral mud
A5.31 Sublittoral mud in low or reduced salinity
A5.311 Baltic brackish water sublittoral muddy biocenoses influenced by varying salinity
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