AB.B4U Baltic aphotic hard clay characterized by no macrocommunity


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic aphotic zone bottoms with at least 90 % coverage of hard clay. No macro- epi- orinfauna.

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