HELCOM RED LIST Biotope Expert Team
Baltic bottoms in the photic zone with at least 90 % coverage of rock, boulders or stones of more than 63 mm in diameter. Annual algae cover at least 10 % of the seabed, while all other epibenthic biotic structures cover less than 10 %.
Salinity range: All; Exposure range: all, more common in exposed areas; Depth range: photic zone – usually in the most shallow part.
Cladophora glomerata, Ceramium tenuicorne, Pilayella littoralis, Ulva spp. Dictypsiphon spp.
Mapping should take place during the months when the vegetation is fully developed. Annual algae can live as epiphytes (e.g. Pilayella/Ectocarpus on Fucus spp.). In the BSEUNIS classification epiphytes are considered to be quality descriptors, not habitat forming. Thus this biotope only occurs when annual algae dominate the substrate and not when they grow on perennial biotic structures.
Whole Baltic Sea
2.1 Rocky bottoms
2.1.1 Soft rock
126.96.36.199 Sublittoral photic zone
188.8.131.52.2 Level bottoms dominated by macrophytevegetation
2.1.2 Solid rock (bedrock)
184.108.40.206 Sublittoral photic zone
220.127.116.11.1 Level bottoms dominated by macrophytevegetation
2.2 Stony bottoms
2.2.2 Sublittoral photic zone
18.104.22.168 Level bottoms dominated by macrophyte
EUNIS 2012: A3.4 : Baltic exposed infralittoral rock A3.5 : Baltic moderately exposed infralittoral rock A3.6 : Baltic sheltered infralittoral rock
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