HELCOM RED LIST Biotope Expert Team
aphotic zone bottoms with at least 90 % coverage of sand. Sand has less than 20 % of mud/silt/clay
fraction (<63 µm), and the proportion of sand (grain size 0.063–2 mm)
exceeds 70% of the combined gravel and sand fraction. Epibenthic bivalves cover at least 10 % of the
seabed, and more than other perennial attached erect groups. Out of the
epibenthic bivalves, Mytilidae constitutes at least 50 % of the biomass.
is sand. Appears in moderate to high energy exposure areas. Salinity must be at
Mytilus spp., Hediste diversicolor
abundance and biomass of fauna.
2.5 Sandy bottoms
2.5.1 Aphotic zone
A5 Sublittoral sediment
A5.2 Sublittoral sand
A5.27 Deep circalittoral sand
A5.273 Baltic sandy bottoms of the aphotic zone
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