EUNIS habitat classification 2017 > M - Marine benthic habitats > MA4 - Littoral mixed sediment > MA42 - Atlantic littoral mixed sediment > MA421 - Seaweed communities on Atlantic littoral mixed sediment

Seaweed communities on Atlantic littoral mixed sediment

Description (English)

Eulittoral mixed substrata subject to variations in salinity and/or siltation characterised by dense blankets of ephemeral green and red seaweeds (MA4-211). This is a biotope with a low species diversity and the relatively high number of species in the characterising species list are due to a variation in the species composition from site to site, not to high species richness on individual sites.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type	code MA421
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)	Large shallow inlets and bays	1160	Overlap	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)	A2.8	Features of littoral sediment	overlap
EUNIS Habitat Classification 2007 (revised descriptions 2012)	A2.82	Ephemeral green or red seaweeds (freshwater or sand-influenced) on mobile substrata	narrower
European Red List of Habitats	NEAA2.82	Vegetated (ephemeral) Atlantic littoral mixed sediment	same

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

History

Classification	Code	Habitat type name	Relationship type
EUNIS Habitat Classification 200410	A2.8	Features of littoral sediment	same
EUNIS Habitat Classification 200410	A2.82	Ephemeral green or red seaweeds (freshwater or sand-influenced) on mobile substrata	same
EUNIS Habitat Classification 200308	A1.24	Ephemeral green or red seaweeds (freshwater- or sand-influenced) on moderately exposed littoral rock	wider
EUNIS Habitat Classification 200308	A2.74	Methane seeps in littoral sediments	narrower
EUNIS Habitat Classification 200202	A1.24	Ephemeral green or red seaweeds (freshwater- or sand-influenced) on moderately exposed littoral rock	narrower
EUNIS Habitat Classification 200202	A2.74	Methane seeps in littoral sediments	same
EUNIS Habitat Classification 199910	A1.23	Ephemeral green or red seaweeds (freshwater- or sand-influenced) on moderately exposed littoral rock	narrower
EUNIS Habitat Classification 199811	A1.23	Green or red ephemeral seaweeds (sand- or freshwater-influenced)	narrower
EUNIS Habitat Classification 199712	A1.33	Green or red ephemeral seaweeds (sand- or freshwater-influenced)	same
MNCR BioMar 97.06 (Britain & Ireland)	MLR.Eph	Ephemeral green or red seaweeds (freshwater- or sand-influenced)	narrower
MNCR BioMar 96.7 (Britain & Ireland)	MLR.GR		same

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