HELCOM RED LIST Biotope Expert Team
Baltic photic bottoms 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). Sessile/semi-sessile epibenthic bivalves cover at least 10 % of the seabed and more than other perennial attached erect groups.
Substrate is muddy sediment. Depth range: photic zone
Diversity, abundance and biomass of fauna.
Whole Baltic Sea
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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