AA.H1B1 Baltic photic muddy sediment characterized by pondweed (Potamogeton perfoliatus and/or Stuckenia pectinata)


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). Submerged rooted plants cover least 10 % of the seabed and more than other perennial attached erect groups. Of the submerged rooted plants, pondweed form at least 50 % in biovolume.

Physical environment       

Salinity range: <6 psu; Exposure range: sheltered; Depth range: photic zone from about 0.2 to 4 meters.

Characteristic species        

Potamogeton perfoliatus, Stuckenia pectinata

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

A5.542 Association with [Potamogeton pectinatus]