AA.A1F Baltic photic rock and boulders characterized by epibenthic chordates


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. Sessile/semi-sessile epibenthic chordates cover at least 10 % of the seabed and more than other perennial attached erect groups.

Physical environment       

Salinity range: high salinity areas; Exposure range: all, more common in exposed areas; Depth range: photic zone

Characteristic species        

sea squirts (Ascidiaceae)

Quality descriptors             

Diversity, abundance and biomass of fauna.

Geographic range               

Whole Baltic Sea

Anthropogenic threats     

Eutrophication

Correspondence with other classification systems               

HELCOM 1998:

2.1 Rocky bottoms

2.1.1 Soft rock

2.1.1.2 Sublittoral photic zone

2.1.2 Solid rock (bedrock)

2.1.2.2 Sublittoral photic zone

2.2 Stony bottoms

2.2.2 Sublittoral photic zone


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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