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 chordates cover at least 10 % of the seabed, and
more than other perennial attached erect groups. Out of the epibenthic
chordates, sea squirts 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.
Ascidiacea: Dendrodoa grossularia, Molgula spp
abundance and biomass of fauna
and Belt Sea
HELCOM 1998:2.8 Mixed sediment bottoms2.8.1 Aphotic zoneEUNIS 2012:A5 Sublittoral sedimentA5.4 : Sublittoral mixed sedimentsA5.41 : Sublittoral mixed sediment in low or reduced salinityA5.412 : Baltic mixed sediment bottoms of the aphotic zonehttp://eunis.eea.europa.eu/habitats/2589
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This biotope has been listed as Near Threatened (NT) in the HELCOM Red List of Baltic Sea biotopes and habitats.