HELCOM RED LIST Biotope Expert Team
Baltic aphotic zone bottoms with at least 90 % coverage of hard clay. Sessile/semi-sessile epibenthic bivalves have a coverage of at least 10%.
Substrate is hard clay. Typically high energy exposure areas.
Diversity, abundance and biomass of fauna.
Whole Baltic Sea
2.3 Hard clay bottoms
2.3.1 Aphotic zone
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HELCOM HUB: Technical Report on the HELCOM Underwater Biotope and habitat classification BSEP 139