AA.I1Q1 Baltic photic coarse sediment dominated by stable aggregations of unattached Fucus spp. (typical form)


HELCOM RED LIST Biotope Expert Team

Textual description            

Baltic bottoms in the photic zone 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 a coverage ≥ 10%. Stable aggregations of unattached perennial vegetation covers at least 10 %, out of which Fucus spp. (typical form)constitutes at least 50 % of the biovolume.

Physical environment       

Salinity range: >4.5 psu; Exposure range: sheltered to exposed; Depth range: photic zone from about 0.5 to 5 meters

Characteristic species        

Fucus vesiculosus (typical form), F. radicans

Geographic RANGE

Whole Baltic Sea

Correspondence with other classification systems               

HELCOM 1998:

2.4 Gravel bottoms

2.4.2 Sublittoral photic zone Level bottoms dominated by macrophyte vegetation

EUNIS 2012:

A5 Sublittoral sediment

A5.5 Sublittoral macrophyte-dominated sediment