HELCOM RED LIST Biotope Expert Team
Baltic aphotic bottoms at least 90 % coverage of hard clay. Epibenthic bivalves cover at least 10% of the seabed and more than other perennial attached erect groups. Out of the epibenthic bivalves, Astarte spp.constitutes at least 50 % of the biomass.
is hard clay. Occur at high energy exposure areas.
from German waters in the Baltic Sea
HELCOM 1998:2.3 Hard clay bottoms2.3.1. Aphotic zone
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This biotope has been listed as Endangered (EN) in the HELCOM Red List of Baltic Sea biotopes and habitats.