AA.B4U Baltic photic hard clay characterized by no macrocommunity


HELCOM RED LIST Biotope Expert Team

Textual description           

Baltic photic zone bottoms with at least 90 % coverage of hard clay. Epibenthic macrovegetation or -fauna is not present.

Physical environment      

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

Geographic range              

Whole Baltic Sea

Anthropogenic threats    


Correspondence with other classification systems               

HELCOM 1998:

2.3 Hard clay bottoms

2.3.2 Sublittoral photic zone Bottoms with little or no macrophyte vegetation