HELCOM RED LIST Biotope Expert Team
aphotic 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). No macrocommunity present. Meiofauna constitutes at least 50% of
the present biomass.
is muddy sediment. Appears in all wave exposure classes.
abundance and biomass of meiofauna
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
Click here to go back to HUB classification
This biotope has been listed as Near Threatened (NT) in the HELCOM Red List of Baltic Sea biotopes and habitats.
See the Biotope Information Sheet of AB.H4U1