AB.M1G4 Baltic aphotic mixed substrate dominated by soft corals (Alcyonacea)


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description 

Baltic 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.

PHYSICAL ENVIRONMENT

Substrate is soft or crystalline rock, boulders or stones mixed with mobile substrates such as sand or coarse substrate.

Characteristic species        

Alcyonium digitatum, Swiftia rosea

Quality descriptors

Diversity, abundance and biomass of fauna

Geographic range

Kattegat and Belt Sea

Correspondence with other classification system

HELCOM 1998:

2.8 Mixed sediment bottoms

2.8.1 Aphotic zone

EUNIS 2012:

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

http://eunis.eea.europa.eu/habitats/2589

 Related Information

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.M1G4

 Publications

BSEP139.jpg