AA.M1I1 Baltic photic mixed substrate dominated by barnacles (Balanidae)


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic photic bottoms with 10- 90 % coverage of hard (rock/boulders/stone) and 10-90 % soft substrata (e.g. muddy/coarse sediment/sand). Epibenthic crustacea cover at least 10%of the seabed and more than other perennial attached erect groups. Out of the epibenthic crustacean, barnacles constitute at least 50 % of the biomass.

Physical environment       

Substrate is soft or crystalline rock, boulders or stones mixed with mobile substrates such as sand or coarse substrate. Depth is typically from 0 to 20 meters. Appears in all wave exposure classes. Salinity must be at least 3 psu.

Characteristic species        

Amphibalanus improvises, Balanus crenatus, Semibalanus balanoides

Quality descriptors                

Diversity, abundance and biomass of fauna

Correspondence with other classification systems               

HELCOM 1998:

2.8 Mixed sediment bottoms

2.8.2 Sublittoral photic zone With little or no macrophyte vegetation

EUNIS 2012:

A5 Sublittoral sediment

A5.4 : Sublittoral mixed sediments

A5.41 : Sublittoral mixed sediment in low or reduced salinity

A5.411 : Baltic level mixed sediment bottoms of the infralittoral photic zone with little or no macrophyte vegetation