AA.A1R Baltic photic rock and boulders characterized by soft crustose algae


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic bottoms in the photic zone with at least 90 % coverage of rock, boulders or stones of more than 63 mm in diameter. Soft crustose algae cover at least 10 % of the seabed while all perennial attached erect groups cover less than 10 %.

Physical environment       

Salinity range: All; Exposure range: all, more common in exposed areas; Depth range: photic zone ‑ more common in the deepest part of the photic zone.

Characteristic species        

Hildenbrandia spp., Pseudolithoderma spp.

Mapping advise (habitat delineation, identification, similar types)             

Mapping should take place during the months when the vegetation is fully developed.

Geographic range               

Whole Baltic Sea

Correspondence with other classification systems               

HELCOM 1998:

2.1 Rocky bottoms

2.1.1 Soft rock

2.1.1.2 Sublittoral photic zone

2.1.1.2.2 Level bottoms dominated by macrophyte vegetation

2.1.2 Solid rock (bedrock)

2.1.2.2 Sublittoral photic zone

2.1.2.2.1 Level bottoms dominated by macrophyte vegetation

2.2 Stony bottoms

2.2.2 Sublittoral photic zone

2.2.2.2 Level bottoms dominated by macrophyte vegetation

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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