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 . Submerged rooted plants cover at least
10 % of the seabed and more than other perennial attached erect groups. Of
the submerged rooted plants, Charales constitutes at least 50 % of the
range: <6 psu; Exposure range: Sheltered to moderately exposed; Depth range:
photic zone from about 0.2 to 7 meters.
Chara aspera, Chara baltica Tolypella nidifica, Chara horrida
Whole Baltic Sea
2.4 Gravel bottoms
2.4.2 Sublittoral photic zone
220.127.116.11 Level bottoms dominated by macrophyte vegetation
A5 Sublittoral sediment
A5.5 Sublittoral macrophyte-dominated sediment
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This biotope has been listed as Near Threatened (NT) in the HELCOM Red List of Baltic Sea biotopes and habitats.
See the Biotope Information Sheet of AA.I1B4