HELCOM RED LIST Biotope Expert Team
Baltic photic zone bottoms with at least 90 % coverage of coarse sediment. Coarse sediment has less than 20 % of mud/silt/clay fraction (<63 µm), and the proportion of gravel and pebbles (grain size 2–63 mm) exceeds 30% of the combined gravel and sand fraction . Biomass of infaunal crustaceans dominates and is highest in the group that includes infaunal bivalves/polychaetes/crustaceans/echinoderms/insect larvae. Out of the infaunal crustacean, Bathyporeia pilosa constitute at least 50% of the biomass.
is muddy sediment.
abundance and biomass of fauna.
2.4 Gravel bottoms
2.4.2 Sublittoral photic zone
188.8.131.52 Level bottoms with little or no macrophyte
A5 Sublittoral sediment
A5.1 Sublittoral coarse sediment
A5.11 Infralittoral coarse sediment in low or reduced salinity
A5.111 : Baltic level gravel bottoms of the infralittoral photic zone
with little or no macrophyte vegetation
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