HELCOM RED LIST Biotope Expert Team
aphotic zone bottoms with at least 10- 90 % coverage of hard
(rock/boulders/stone) and 10-90 % soft substrata (e.g. muddy/coarse
sediment/sand). Epibenthic cnidarians
cover at least 10 % of the seabed, and more than other perennial attached erect
groups. Out of the epibenthic cnidarians, soft corals constitute at least 50 %
of the biomass.
is soft or crystalline rock, boulders or stones mixed with mobile substrates
such as sand or coarse substrate.
Alcyonium digitatum, Swiftia rosea
abundance and biomass of fauna
and Belt Sea
2.8 Mixed 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.