HELCOM RED LIST Biotope Expert Team
Baltic bottoms in the photic zone with at least 90 % coverage of rock, boulders or stones of more than 63 mm in diameter. Epibenthic bivalves cover at least 10%of the seabed and more than other perennial attached erect groups. Out of the epibenthic bivalves Dreissena polymorpha constitutes at least 50 % of the biomass.
Substrate is rock and/or boulders. Depth is typically from 2 to 10 meters. Appears in sheltered to moderately exposed areas. Salinity must be less than 5 psu.
Amount of sediment and epiphytic annual algae. Diversity, abundance and biomass of fauna.
Estonian west coast and eastern Gulf of Finland
184.108.40.206.1 Sublittoral level soft rock bottoms with little or no macrophyte vegetation 220.127.116.11.1 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
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