AA.J3L1 Baltic photic sand dominated by Baltic tellin (Macoma balthica)


Author                                     

HELCOM RED LIST Biotope Expert Team

Textual description 

Baltic photic zone bottoms with at least 90 % coverage of sand. Sand has less than 20 % of mud/silt/clay fraction (<63 µm), and the proportion of sand (grain size 0.063–2 mm) exceeds 70% of the combined gravel and sand fraction.  Biomass of infaunal bivalves dominates and is highest in the group that includes infaunal bivalves/polychaetes/crustaceans/echinoderms/insect larvae. Out of the infaunal bivalves, Macoma balthica constitutes at least 50 % of the biomass.        

Physical environment       

Substrate is sand. Appears in all exposure classes. Salinity >3 psu

Characteristic species        

Macoma balthica

Quality descriptors

Diversity, abundance and biomass of fauna

Correspondence with other classification systems               

HELCOM 1998:

2.5 Sandy bottoms

2.5.2 Sublittoral photic zone

2.5.2.1 Level bottoms with little or no macrophyte

vegetation

EUNIS 2012:

A5 Sublittoral sediment

A5.2 Sublittoral sand

A5.21 Sublittoral sand in low or reduced salinity

A5.211 Baltic level sandy bottoms of the infralittoral photic zone with little or no macrophyte vegetation

http://eunis.eea.europa.eu/habitats/2580

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