AB.B4 Baltic aphotic hard clay characterized by no macroscopic biotic structures


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic bottoms in the aphotic zone with at least 90 % coverage of hard clay. No macro- epi- or infauna.

Physical environment       

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

Mapping advise (habitat delineation, identification, similar types)             

Aphotic zone areas which form a mosaic of both hard and soft substrata. No macro- epi- or infauna.

Geographic range               

Whole Baltic Sea                  

Correspondence with other classification systems               

HELCOM 1998:

2.3 Hard clay bottoms

2.3.1 Aphotic zone