AA.H1A1 Baltic photic muddy sediment dominated by common reed (Phragmites australis)


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic bottoms in the photic zone with at least 90 % coverage of muddy sediment. The sediment must contain at least 20 % of mud, silt or clay (grain size less than 63 ┬Ám). Emergent vegetation covers least 10 % of the seabed and more than other perennial attached erect groups. Of the emergent vegetation, common reed constitutes at least 50 % of the biovolume.

Physical environment       

Salinity range: < 6 psu; Exposure range: sheltered; Depth range: photic zone down to about 2 meters.

Characteristic species        

Phragmites australis

Geographic range               

Whole Baltic Sea

Correspondence with other classification systems               

HELCOM 1998:
2.7 Muddy bottoms

2.7.2 Sublittoral photic zone Dominated by macrophyte vegetation

EUNIS 2012:

A5 Sublittoral sediment

A5.5 Sublittoral macrophyte-dominated sediment

A5.54 Angiosperm communities in reduced salinity

A5.541 Vegetation of brackish waters dominated by [Phragmites australis]