AA.J1B Baltic photic sand characterized by submerged rooted plants


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic bottoms in the photic zone with at least 90 % coverage of sand. Sand has less than 20 % of mud/silt/clay fraction (<63 µm), and the proportion of sand (grain size 0.063–2 mm) exceeds 70% of the combined gravel and sand fraction. Submerged rooted plants, including plants with rhizoids (i.e. Charales) cover at least 10 % of the seabed and more than other perennial attached erect groups.

Physical environment       

Salinity range: all; Exposure range: moderate; Depth range: photic zone

Characteristic species        

Stuckenia pectinata, Zannichellia spp., Zostera marina, Charales

Geographic range              

Whole Baltic Sea

Anthropogenic threats     

Decreased light penetration depth and increased sedimentation caused by eutrophication

Correspondence with other classification systems               

HELCOM 1998:

2.5 Sandy bottoms

2.5.2 Sublittoral photic zone

2.5.2.2 Level bottoms 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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