AB.B2T Baltic aphotic hard clay characterized by sparse epibenthic macrocommunity


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic aphotic zone bottoms with at least 90 % coverage of hard clay. Sessile/semi-sessile epibenthic fauna is present butcovers less than 10% of the seabed.

Physical environment       

Substrate is hard clay. Typically high energy exposure areas.

Geographic range               

Whole Baltic Sea

Anthropogenic threats     


Correspondence with other classification systems               

HELCOM 1998:

2.3Hard clay bottoms

2.3.1 Aphotic zone