AB.B1V Baltic aphotic hard clay characterized by mixed epibenthic macrocommunity


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic aphotic zone bottoms with at least 90 % coverage of hard clay. No perennial attached erect group has ≥ 10 % coverage.

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:

2.3 Hard clay bottoms

2.3.1 Aphotic zone