AA.A1H1 Baltic photic rock and boulders dominated by crustose moss animals (Electra crustulenta)


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. Epibenthic moss animals cover at least 10% of the seabed, and more than other perennial attached erect groups. Out of the attached epibenthic moss animals Electra crustulenta constitutes at least 50 % in volume or biomass.

Physical environment       

Substrate is rock and/or boulders. Salinity range: all

Characteristic species        

Electra crusulenta

Quality descriptors             

Diversity, abundance and biomass of fauna.

Geographic range               

Whole Baltic Sea

Correspondence with other classification systems               

HELCOM 1998: Sublittoral level soft rock bottoms with little or no macrophyte vegetation Sublittoral level stony bottoms with little or no macrophyte vegetation
EUNIS 2012:
A3.4 : Baltic exposed infralittoral rock
A3.5 : Baltic moderately exposed infralittoral rock
A3.6 : Baltic sheltered infralittoral rock