HELCOM RED LIST Biotope Expert Team
photic zone 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). Macrovegetation or – fauna is not present. Meiofauna constitute at
least 50% of the biomass.
is muddy sediment. Appears in all wave exposure classes.
abundance and biomass of meiofauna
2.7 Muddy bottoms
2.7.2 Sublittoral photic zone
220.127.116.11 With little or no macrophyte vegetation
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
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