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 . Perennial attached algae cover at least
10 % of the seabed and more than other perennial attached erect groups. Out
of the perennial attached algae perennial foliose red algae constitute at least
50 % of the biovolume.
range: >4.5 psu; Exposure range: Sheltered; Depth range: photic zone from
about 2 to 10 meters
Coccotylus truncatus, Phyllophora spp.
to the Quark in the north and central Gulf of Finland in the east
light penetration depth and increased sedimentation caused by eutrophication
2.4 Gravel bottoms
2.4.2 Sublittoral photic zone
188.8.131.52 Level bottoms dominated by macrophyte vegetation
A5 Sublittoral sediment
A5.5 Sublittoral macrophyte-dominated sediment
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