AA.M1C5 Baltic photic mixed substrate dominated by perennial filamentous algae


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description 

Baltic bottoms in the photic zone with more than 10 %, but less than 90 % coverage of both hard and soft substrata. Perennial algae covers at least 10 % of the seabed and more than other perennial attached erect groups. Out of the perennial algae, perennial filamentous algae constitutes at least 50 % of the biovolume.

Physical environment       

Salinity range: >5 psu; Exposure range: moderate to high; Depth range: photic zone from about 2 meters.

Characteristic species        

Polysiphonia fucoides, Aegagrophila linnaei, Cladophora rupestris, Rhodomela confervoides

QUALITY DESCRIPTORS

Lower limit of vegetation, amount of epiphytic algae

GEOGRAPHIC RANGE

Whole Baltic Sea

ANTHROPOGENIC THREATS

Eutrophication

Correspondence with other classification systems               

HELCOM 1998:

2.8 Mixed sediment bottoms

2.8.2 Sublittoral photic zone

2.8.2.2 Dominated by macrophyte vegetation

EUNIS 2012:

A5 Sublittoral sediment

A5.5 Sublittoral macrophyte-dominated sediment

http://eunis.eea.europa.eu/habitats/1733


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