HELCOM RED LIST Biotope Expert Team
Baltic 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 . Biomass of infaunal bivalves dominates and is highest in the group that includes infaunal bivalves/polychaetes/crustaceans/echinoderms/insect larvae. Ophelia spp. and Travisia forbesii constitute ≥10 % of the macroinfaunal biomass when disregarding the biomass of bivalves.
Ophelia spp , Travisia forbesii , Tanaissus spp., Streptosyllis spp.
abundance and biomass of fauna
bight to Darss sill
2.4 Gravel bottoms
2.4.1 Aphotic zone
Gravel bottoms with Ophelia species
- habitat under threat and/or in decline in all areas of occurrence: Bay of Mecklenburg, Kiel Bay, Little Belt, Great Belt, The Sound, Kattegat
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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This biotope has been listed as Near Threatened (NT) in the HELCOM Red List of Baltic Sea biotopes and habitats.