AB.A2 Baltic aphotic rock and boulders characterized by sparse macroscopic epibenthic structures


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic bottoms in the aphotic zone with at least 90 % coverage of rock, boulders or stones of more than 63 mm in diameter. Coverage of sessile macroscopic epifauna is 0><10%.

Physical environment       

Salinity range: all; Exposure range: all; Depth range: below photic zone ‑ more common in the deep. 

Mapping advise (habitat delineation, identification, similar types)             

Areas with at least 90 % coverage of rock, boulders and/or stones of more than 63 mm in diameter within the aphotic zone. Coverage of sessile macroscopic epifauna is 0><10%.

Geographic range               

Whole Baltic Sea

Correspondence with other classification systems               

HELCOM 1998:
2.1Rocky bottoms

2.1.1Aphotic zone


2.2Stony bottoms

2.2.1 Aphotic zone


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