HELCOM RED LIST Biotope Expert Team
Baltic aphotic bottoms with at least 90 % coverage of coarse sediment. Coarse sediment has less than 20 % of mud/silt/clay fraction (<63 µm), and the proportion of gravel and pebbles (grain size 2–63 mm) exceeds 30% of the combined gravel and sand fraction . Macro- epi- or infauna is not present.
Substrate is coarse sediment. Depth below approximately 30 m. Appears in high energy exposure areas.
Whole Baltic Sea
HELCOM 1998: 2.4 Gravel bottoms
2.4.1 Aphotic zone
A5 Sublittoral sediment
A5.1 Sublittoral coarse sediment
A5.11 Infralittoral coarse sediment in low or reduced salinity
A5.114 : Baltic gravel bottoms of the aphotic zone
Click here to go back to HUB classification