HELCOM RED LIST Biotope Expert Team
Baltic photic 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 constitute at least 50 % of the biomass.
Pygiospio elegans, Marenzelleria spp.,Hediste diversicolor
abundance and biomass of fauna.
2.5 Sandy bottoms
2.5.2 Sublittoral photic zone
22.214.171.124 Level bottoms with little or no macrophyte
A5 Sublittoral sediment
A5.2 Sublittoral sand
A5.21 Sublittoral sand in low or reduced salinity
A5.211 Baltic level sandy bottoms of the infralittoral photic zone with
little or no macrophyte vegetation
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