HELCOM RED LIST Biotope Expert Team
Baltic aphotic bottoms with 10- 90 % coverage of hard (rock/boulders/stone) and 10-90 % soft substrata (e.g. muddy/coarse sediment/sand). Sessile/semi-sessile epibenthic sponges cover at least 10 % of the seabed and more than other perennial attached erect groups.
Substrate is soft or crystalline rock, boulders or stones mixed with mobile substrates such as sand or coarse substrate. Depth is typically from 20 to 100 meters.
Diversity, abundance and biomass of fauna.
Whole Baltic Sea
2.8Mixed sediment bottoms
2.8.1 Aphotic zone
A5 Sublittoral sediment
A5.4 : Sublittoral mixed sediments
A5.41 : Sublittoral mixed sediment in low or reduced salinity
A5.412 : Baltic mixed sediment 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.
See the Biotope Information Sheet of AB.M1J