HELCOM RED LIST Biotope Expert Team
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 . Epibenthic bivalves cover more than 10 % of
the seabed, and more than other perennial attached erect groups. Out of the
epibenthic bivalves Mytilidae constitute at least 50 % of the biomass.
is coarse sediment. Appears in high energy exposure areas. Salinity >5 psu.
Mytilus spp., Hediste diversicolor
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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