HELCOM RED LIST Biotope Expert Team
Baltic bottoms in the photic zone with at least 90 % coverage of maerl (unattached particles of coralline red algae).
Salinity range: High; Exposure range: All; Depth range: Photic zone
Lithothamnion spp. and Phymatolithon spp.
Photic zone beds of unattached particles of coralline red algae particles (maximum
diameter ≈5cm) in gravel and sand. Areas where maerl occur are
generally well ventilated with low levels of turbidity at depths of
17-22 m. Maerlbeds have a patchy distribution.
Kattegatt; Lilla Middelgrund and Fladen
Extraction mining, ocean acidification, offshore wind-farms, destructive
fishing methods and eutrophication causing increased turbidity
- habitat under threat and/or in decline in all areas of occurrence
A5 Sublittoral sediment
A5.5 Sublittoral macrophyte-dominated sediment
A5.51 Maerl beds
OSPAR list of threathened biotopes:
- habitat occurs in the OSPAR region II (including Kattegat) but is not listed threatened and/or in decline in this region
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This biotope has been listed as Endangered (EN) in the HELCOM Red List of Baltic Sea biotopes and habitats.
See the Biotope information Sheet of AA.D