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 . No perennial attached erect group has a coverage ≥ 10%. Stable aggregations of unattached perennial vegetation covers at least 10 %, out of which Furcellaria lumbricalis constitutes at least 50 % of the biovolume.
range: >4.5 psu; Exposure range: sheltered to exposed; Depth range: photic
zone from about 2 to 10 meters
Baltic Sea, typical along the coast of the Baltic states
light penetration depth and increased sedimentation caused by eutrophication.
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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