AB.I1V Baltic aphotic coarse sediment characterized by mixed epibenthic macrocommuntiy


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description            

Balticaphotic bottoms with at least 90 % coverage of coarse sediment. Coarse sediment has less than 20 % of mud/silt/clay fraction (<63 µm), and the proportion of gravel and pebbles (grain size 2–63 mm) exceeds 30% of the combined gravel and sand fraction . No perennial attached erect group has ≥ 10 % coverage.

Physical environment       

Substrate is coarse sediment. Depth below approximately 30 m. Appears in high energy exposure areas.

Geographic range               

Whole Baltic Sea

Correspondence with other classification systems               

HELCOM 1998:

2.4 Gravel bottoms

2.4.1 Aphotic zone

EUNIS 2012:

A5 Sublittoral sediment

A5.1 Sublittoral coarse sediment

A5.11 Infralittoral coarse sediment in low or reduced salinity

A5.114 : Baltic gravel bottoms of the aphotic zone

http://eunis.eea.europa.eu/habitats/2619


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