HELCOM RED LIST Biotope Expert Team
Baltic 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. Biomass of infaunal polychaetes dominates and is highest in the group that includes infaunal bivalves/polychaetes/crustaceans/echinoderms/insect larvae. Out of the infaunal polychaetes, Pygiospio elegans, Marenzelleria spp. and Hediste diversicolor constitutes at least 50 % of the biomass.
is sand. Appears in moderate to high exposure classes.
Pygospio elegans, Marenzelleria spp. and 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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