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AB.H3O1 Baltic aphotic muddy sediment dominated by Amphiura filiformis


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description 

Baltic aphotic zone 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). Biomass of infaunal echinoderms dominates and is highest in the group that includes infaunal bivalves/polychaetes/crustaceans/echinoderms/insect larvae. Out of the infaunal echinoderms, Amphiura filiformis constitutes at least 50% of the biomass.

Physical environment       

Substrate is muddy sediment. Appears in all wave exposure classes. Salinity >12 psu.

Characteristic species        

Amphiura filiformis , Amphiura chiajei, Ophiura spp, Echinocardium sp.

Quality descriptors

Diversity, abundance and biomass of fauna

GEOGRAPHIC RANGE

Kattegat

ANTHROPOGENIC THREATS

Eutrophication

Correspondence with other classification systems               

HELCOM 1998:
EUNIS 2012:

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

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