AB.J1 Baltic aphotic sand characterized by macroscopic epibenthic biotic structures


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic bottoms in the aphotic 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. Coverage of sessile macroscopic epifauna is  ≥10%.

Physical environment       

Salinity range: all; Exposure range: all; Depth range: aphotic zone

Characteristic species        

Mytilus spp.

Mapping advise (habitat delineation, identification, similar types)             

Sandy bottoms in the aphotic zone with less than 20 % of mud/silt/clay fraction (<63 µm) and more than 70 % of sand (grain size 0.063–2 mm ). Coverage of sessile macroscopic epifauna is  ≥10%.

Geographic range               

Whole Baltic Sea

Anthropogenic threats     

Sand excavation, silting caused by eutrophication, dredging spoil deposition etc.

Correspondence with other classification systems               

HELCOM 1998:

2.5 Sandy bottoms

2.5.1 Aphotic zone

EUNIS 2012:

A5 Sublittoral sediment

A5.2 Sublittoral sand

A5.27 Deep circalittoral sand

A5.273 Baltic sandy bottoms of the aphotic zone

http://eunis.eea.europa.eu/habitats/2620


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