HELCOM RED LIST Biotope Expert Team
Baltic photic 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. Sessile/semi-sessile bivalves cover at least 10 % of the seabed and more than other perennial attached erect groups.
Substrate is coarse sediment. Appears in high energy exposure areas.
Diversity, abundance and biomass of fauna.
Whole Baltic Sea
HELCOM 1998: 2.4 Gravel bottoms
2.4.2 Sublittoral photic zone
220.127.116.11 Level bottoms with little or no macrophyte vegetation
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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