HELCOM RED LIST Biotope Expert Team
Baltic 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, Zannichellia spp. and/or Ruppia spp. and/or Zostera noltii constitute at least 50 % of the biovolume.
range: low to moderate; Exposure range: low to moderate; Depth range: photic
zone from about 0.1 to 4 meters.
Zannichellia palustris, Ruppia maritima, Zostera noltii
Whole Baltic Sea, Zostera noltii occurs only in the Belt Sea and Kattegat area.
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
A5.53 Sublittoral seagrass beds
A5.534 : [Ruppia] and [Zannichellia] communities
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