AA.A1G Baltic photic rock and boulders characterized by epibenthic cnidarians


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic bottoms in the photic zone with at least 90 % coverage of rock, boulders or stones of more than 63 mm in diameter. Sessile/semi-sessile epibenthic cnidarians cover at least 10 % of the seabed and more than other perennial attached erect groups.

Physical environment       

Salinity range: All; Exposure range: all, more common in exposed areas; Depth range: photic zone

Characteristic species        

hydroids, sea anemones, corals

Quality descriptors             

Diversity, abundance and biomass of fauna.

Geographic range               

Whole Baltic Sea

Anthropogenic threats     


Correspondence with other classification systems               

HELCOM 1998:

2.1 Rocky bottoms

2.1.1 Soft rock Sublittoral photic zone

2.1.2 Solid rock (bedrock) Sublittoral photic zone

2.2 Stony bottoms

2.2.2 Sublittoral photic zone

EUNIS 2012:
A3.4 : Baltic exposed infralittoral rock
A3.5 : Baltic moderately exposed infralittoral rock
A3.6 : Baltic sheltered infralittoral rock