HELCOM RED LIST Biotope Expert Team
bottoms in the photic zone with at least 90 % coverage of muddy
sediment. The sediment must contain at least 20 % of mud, silt or clay
(grain size less than 63 µm). Submerged rooted plants cover at least
10 % of the seabed and more than other perennial attached erect groups.
Of the submerged rooted plants, spiny naiad constitutes at least 50 % of
range: >6 psu; Exposure range: moderate to high; Depth range: photic zone
from about 1 to 6 meters.
2.7 Muddy bottoms
2.7.2 Sublittoral photic zone
18.104.22.168 Dominated by macrophyte vegetation
- Habitat under threat and/or in decline in all areas of occurrenceThe Bothnian Sea, Åland Sea, Archipelago Sea, Gulf of Finland, Gulf ot Riga, The Northern Baltic Proper, Western Gotland Basin, Eastern Gotland Sea, The Southern Baltic Proper, The Gulf of Gdansk, Bay of Mecklenburg, Kiel Bay, Little Belt, Great Belt, The Sound, Kattegat
A5 Sublittoral sediment
A5.5 Sublittoral macrophyte-dominated sediment
A5.54 Angiosperm communities in reduced salinity
A5.545 [Zostera] beds in reduced salinity infralittoral sediments
OSPAR list of threathened biotopes:
- Habitat occurs in the OSPAR Region II (including Kattegat) and is listed threatened and/or in decline in this region
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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.H1B7