AA.A1H2 Baltic photic rock and boulders dominated by erect moss animals (Flustra foliacea)


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic photic zone bottoms with at least 90 % coverage of rock or boulders.   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, Flustra foliaceae constitutes at least 50 % in volume or biomass.

Physical environment       

Substrate is rock and/or boulders.

Characteristic species        

Flustra foliacea

Quality descriptors             

Diversity, abundance and biomass of fauna.

Geographic range               

Southern 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

 Related information

This biotope has been listed as Near Threatened (NT) in the HELCOM Red List of Baltic Sea biotopes and habitats.

See the Biotope Information Sheet of AA.A1H2