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). No macro-
epi- or infauna.
Salinity range: All; Exposure range: All; Depth
range: Below photic zone ‑ more common in deeper areas.
Muddy sediment bottoms in the aphotic zone. No
macro- epi- or infauna.
Whole Baltic Sea
Dredging, dredge spoil dumping, poisonous
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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