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 . No macrovegetation or epibenthic macrofauna. Biomass of infaunal bivalves dominates in the group infaunal bivalves/polychaetes/crustaceans/echinoderms/insect.
Substrate is coarse sediment. Appears in high energy exposure areas.
Macoma calcarea, Mya truncate, Astrarte spp. Spisula spp.
Diversity, abundance and biomass of fauna.
Whole Baltic Sea
HELCOM 1998: 2.4 Gravel bottoms
2.4.2 Sublittoral photic zone
18.104.22.168 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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