AB.H1K1 Baltic aphotic muddy sediment dominated by various tube-building polychaetes


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). Epibenthic polychaetes cover at least 10%of the seabed and more than other perennial attached erect groups. Out of the epibenthic polychaetes, various tube-building polychaetes constitutes at least 50 % of the biomass.

Physical environment       

Substrate is muddy sediment. Appears in low to moderate energy exposure classes.

Characteristic species        

Several species from the taxa Maldanidae and Terebellidaa

Quality descriptors

Diversity, abundance and biomass of fauna

GEOGRAPHIC RANGE

Western Baltic Sea, including the Sound and Kattegat

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

 Publications

BSEP139.jpg