AB.H4U Baltic aphotic muddy sediment characterized by no macrocommunity


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic aphotic bottoms 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).No macro- epi- or infauna is present.

Physical environment       

Substrate is muddy sediment. Depth below approximately 20 m. Appears in all energy exposure classes.

Characteristic species        

meiofauna, bacteria

Geographic range               

Whole Baltic Sea

Correspondence with other classification systems               

HELCOM 1998:
2.7 Muddy bottoms

2.7.1Aphotic zone

 

EUNIS 2012:

A5 Sublittoral sediment

A5.3 Sublittoral mud

A5.37 Deep circalittoral mud

A5.378 Baltic muddy bottoms of the aphotic zone

http://eunis.eea.europa.eu/habitats/2588