AA.H3 Baltic photic muddy sediment characterized by macroscopic infaunal biotic structures


Author

HELCOM RED LIST Biotope Expert Team

Textual description

Baltic bottoms in the photic zone 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). Macroscopic infauna present, no macrovegetation or epibenthic macrofauna.

Physical environment

Salinity range: all; Exposure range: sheltered; Depth range: the lowest part of the photic zone

Mapping advise (habitat delineation, identification, similar types)

Photic zone areas with muddy sediment, such as soft clay, silt or mud. This includes mixed sediments where clay and/or mud are mixed with sand or gravel. Macroscopic infauna present, no macrovegetation or epibenthic macrofauna.

Geographic range

Whole Baltic Sea

Anthropogenic threats

Eutrophication

Correspondence with other classification systems

HELCOM 1998:
2.7 Muddy bottoms

2.7.2 Sublittoral photic zone

2.7.2.1 With little or no macrophyte vegetation

 EUNIS 2012:

A5 Sublittoral sediment

A5.3 Sublittoral mud

A5.31 Sublittoral mud in low or reduced salinity

A5.311 Baltic brackish water sublittoral muddy biocenoses influenced by varying salinity

http://eunis.eea.europa.eu/habitats/2585

 Publications

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