AA.B2T Baltic photic hard clay characterized by sparse epibenthic macrocommunity


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic photic zone bottoms with at least 90 % coverage of hard clay. Coverage of macroscopic vegetation or sessile macroscopic epifauna is 0><10%.

Physical environment       

Substrate is hard clay. Depth range: photic zone. Typically high energy exposure areas.

Quality descriptors             

Diversity, abundance and biomass of fauna.

Geographic range               

Whole Baltic Sea

Anthropogenic threats     


Correspondence with other classification systems               

HELCOM 1998:

2.3 Hard clay bottoms

2.3.2 Sublittoral photic zone Bottoms with little or no macrophyte vegetation