HELCOM RED LIST Biotope Expert Team
Baltic bottoms in the aphotic 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). Coverage of sessile macroscopic epifauna is 0><10%.
Salinity range: All; Exposure range: All; Depth range: Below photic zone ‑ more common in deeper areas.
Macoma balthica, Saduria entomon, Marenzelleria spp, Monoporeia affinis
Muddy sediment bottoms in the aphotic zone. Coverage of sessile macroscopic epifauna is 0><10%.
Whole Baltic Sea
Dredging, dredge spoil dumping, poisonous substances
2.7 Muddy bottoms
2.7.1 Aphotic zone
A5 Sublittoral sediment
A5.3 Sublittoral mud
A5.37 Deep circalittoral mud
A5.378 Baltic muddy bottoms of the aphotic zone
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