HELCOM RED LIST Biotope Expert Team
bottoms in the photic zone 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 . Emergent vegetation covers least 10 %
of the seabed and more than other perennial attached erect groups. Out of the
emergent vegetation, sedges constitutes at least 50 % of the biovolume.
range: < 5 psu; Exposure range: sheltered; Depth range: photic zone down to
about 1 meters.
Schoenoplectus spp, Bolbaschoenus maritimus
Whole Baltic Sea
2.4 Gravel bottoms
2.4.2 Sublittoral photic zone
18.104.22.168 Level bottoms dominated by macrophyte vegetation
A5 Sublittoral sediment
A5.5 Sublittoral macrophyte-dominated sediment
A5.54 Angiosperm communities in reduced salinity
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