HELCOM RED LIST Biotope Expert Team
Baltic 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). Biomass of infaunal polychaetes dominates and is highest in the group that includes infaunal bivalves/polychaetes/crustaceans/echinoderms/insect larvae. Out of the infaunal polychaetes Marenzelleria spp. constitutes at least 50 % of the biomass.
is muddy sediment. Appears in low to moderate energy exposure classes.
Marenzelleria arctia, Marenzelleria viridis, Marenzelleria neglecta
abundance and biomass of fauna.
2.7 Muddy bottoms
2.7.2 Sublittoral photic zone
126.96.36.199 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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