AA.H1B5 Baltic photic muddy sediment dominated by spiny naiad (Najas marina)


Author                                     

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 at least 10 % of the seabed and more than other perennial attached erect groups. Of the submerged rooted plants, spiny naiad constitutes at least 50 % of the biovolume

Physical environment       

Salinity range: <4 psu; Exposure range: extremely sheltered; Depth range: photic zone to about 1 meter.

Characteristic species        

Najas marina

Anthropogenic threats     

Eutrophication

Correspondence with other classification systems               

HELCOM 1998:

2.7 Muddy bottoms

2.7.2 Sublittoral photic zone

2.7.2.2 Dominated by macrophyte vegetation

EUNIS 2012:

A5 Sublittoral sediment

A5.5 Sublittoral macrophyte-dominated sediment

A5.54 Angiosperm communities in reduced salinity

http://eunis.eea.europa.eu/habitats/1591

 Related information

This biotope has been listed as Near Threatened (NT) in the HELCOM Red List of Baltic Sea biotopes and habitats.

See the Biotope Information Sheet of AA.H1B5

 Publications