HELCOM RED LIST Biotope Expert Team
aphotic 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 .No macrocommunity present. Meiofauna
constitutes at least 50% of the present biomass.
is coarse sediment. Appears in all wave exposure classes.
abundance and biomass of meiofauna.
2.4 Gravel bottoms
2.4.1 Aphotic zone
A5 Sublittoral sediment
A5.1 Sublittoral coarse sediment
A5.11 Infralittoral coarse sediment in low or reduced salinity
A5.114 : Baltic gravel bottoms of the aphotic zone
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