EUNIS habitat classification 2017 > M - Marine benthic habitats > MD2 - Offshore circalittoral biogenic habitat > MD23 - Baltic offshore circalittoral biogenic habitat > MD231 - Baltic offshore circalittoral biogenic bottoms characterized by epibenthic bivalves > MD2313 - Baltic offshore circalittoral mixed bottoms characterized dominated by barnacles (Balanidae)

Baltic offshore circalittoral mixed bottoms characterized dominated by barnacles (Balanidae)

Description (English)

Baltic offshore bottoms in the aphotic zone, below halocline/pycnoclinewith at least 10- 90 % coverage of hard (rock/boulders/stone) and 10-90 % soft substrata (e.g. muddy/coarse sediment/sand). Epibenthic crustacea cover at least 10 % of the seabed, and more than other perennial attached erect groups. Out of the epibenthic crustacean, barnacles constitute at least 50 % of the biomass.
Physical environment
Substrate is soft or crystalline rock, boulders or stones mixed with mobile substrates such as sand or coarse substrate. Depth is typically from 20 to 100 meters. Appears in all wave exposure classes. Salinity >3 psu.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type	code MD2313
Relation to	Resolution 4 habitat type (used for designation of Emerald sites)

Legal status

Relation to other habitat types mentioned in legal instruments

Legal text	Annex	Name in legal text	Code in legal text	Habitat type relationship	More information
Convention on the conservation of European wildlife and natural habitats	Revised Annex I of Resolution 4 (1996) of the Bern Convention on endangered natural habitats types using the EUNIS habitat classification (year of revision 2010)	Reefs	1170	Narrower	https://wcd.coe.int/ViewDoc....ckColorLogged=FDC864 Resolution No. 4 (1996) of the Bern Convention lists endangered natural habitats requiring specific conservation measures [and the designation of Areas of Special Conservation Interest (ASCIs) forming the Emerald network]

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Not available

Other classifications

Classification	Code	Habitat type name	Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012)	A5.6	Sublittoral biogenic reefs	narrower

For relation to plant communities (syntaxa), see Vegetation types

History

Classification	Code	Habitat type name	Relationship type
EUNIS Habitat Classification 200410	A5.6	Sublittoral biogenic reefs	same
EUNIS Habitat Classification 200308	A4.6	Sublittoral biogenic structures	same
EUNIS Habitat Classification 200308	A3.72	Sheltered Modiolus beds	narrower
EUNIS Habitat Classification 200202	A3.72	Sheltered Modiolus beds	narrower
EUNIS Habitat Classification 200202	A4.6	Biogenic structures over sublittoral sediments	same
EUNIS Habitat Classification 199910	A3.72	Sheltered Modiolus beds	narrower
EUNIS Habitat Classification 199910	A4.48	Biogenic beds on sublittoral mixed sediments	same
EUNIS Habitat Classification 199811	A3.72	Sheltered Modiolus beds	same
EUNIS Habitat Classification 199712	A5.32	Sheltered horse mussel Modiolus beds	same
MNCR BioMar 97.06 (Britain & Ireland)	SCR.Mod	Sheltered Modiolus (horse mussel) beds	same
MNCR BioMar 96.7 (Britain & Ireland)	SCR.Mod		same

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