AB.H2T Baltic aphotic muddy sediment characterized by sparse epibenthic macrocommuntiy


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). Sessile/semi-sessile epibenthic fauna is present but covers less than 10% of the seabed.

Physical environment       

Substrate is shell gravel. Depth below approximately 20 m. Appears in all energy exposure classes.

Geographic range               

Southern part of Baltic Sea

Anthropogenic threats     

Increase in atmospheric CO2 (Ocean acidification)

Correspondence with other classification systems               

HELCOM 1998:

2.7 Muddy bottoms

2.7.1 Aphotic 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