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). No macrovegetation or epibenthic macrofauna. Biomass of infaunal echinoderms dominates in the group infaunal bivalves/polychaetes/crustaceans/echinoderms/insect larvae.
Substrate is muddy sediment. Appears in all energy exposure classes. Salinity relatively high (above approximately 10-15)
Amphiura spp, Ophiura spp, Brissopsis lyrifera, Echinocardium spp
Diversity, abundance and biomass of fauna.
Kattegatt, the Sound
HELCOM 1998: 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 varying salinity
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