AB.B1 Baltic aphotic hard clay characterized by macroscopic epibenthic biotic structures


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic bottoms in the aphotic zone with at least 90 % coverage of hard clay. Coverage of sessile macroscopic epifauna is ≥10%.

Physical environment       

Salinity range: all; Exposure range: all; Depth range: below photic zone.

Characteristic species        

Mytilus spp., Astarte spp.

Mapping advise (habitat delineation, identification, similar types)             

Aphotic zone areas with at least 90 % coverage of hard clay. Coverage of sessile macroscopic epifauna is ≥10%.

Geographic range               

Whole Baltic Sea

Correspondence with other classification systems               

HELCOM 1998:

2.3 Hard clay bottoms

2.3.1 Aphotic zone


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