EUNIS habitat classification 2017 > M - Marine benthic habitats > MB4 - infralittoral mixed sediment > MB42 - Atlantic infralittoral mixed sediment > MB421 - Maerl beds on Atlantic infralittoral mixed sediment

Maerl beds on Atlantic infralittoral mixed sediment

Description (English)

Beds of maerl in coarse clean sediments of gravels and clean sands, which occur either on the open coast or in tide-swept channels of marine inlets (the latter often stony). In fully marine conditions the dominant maerl is typically Phymatolithon calcareum (MB3-221), whilst under variable salinity conditions in some sealochs beds of Lithothamnion glaciale (MB3-222) may develop.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MB421
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Phymatolithon calcareum
Species scientific name English common name Species group
Phymatolithon calcareum Algae

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A5.51 Maerl beds narrower
European Red List of Habitats NEAA5.51 Atlantic maerl beds narrower
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A5.51 Maerl beds same
EUNIS Habitat Classification 200308 A4.61 Seaweeds and maerl on coarse shallow-water sediments narrower
EUNIS Habitat Classification 200308 A4.62 Maerl beds on shallow-water muddy mixed sediments narrower
EUNIS Habitat Classification 200308 A4.65 Maerl beds on deep-water muddy sediments overlap
EUNIS Habitat Classification 200202 A4.65 Maerl beds on deep-water muddy sediments narrower
EUNIS Habitat Classification 200202 A4.61 Seaweeds and maerl on coarse shallow-water sediments narrower
EUNIS Habitat Classification 200202 A4.62 Maerl beds on shallow-water muddy mixed sediments narrower
EUNIS Habitat Classification 199910 A4.11 Seaweeds and maerl on coarse shallow-water sediments narrower
EUNIS Habitat Classification 199910 A4.42 Maerl beds on shallow-water muddy mixed sediments narrower
EUNIS Habitat Classification 199811 A4.11 Seaweeds and maerl on coarse infralittoral sediments narrower
EUNIS Habitat Classification 199811 A4.42 Maerl beds on muddy mixed sediments narrower
EUNIS Habitat Classification 199712 A4.11 Seaweeds and maerl on coarse infralittoral sediments same
MNCR BioMar 97.06 (Britain & Ireland) IMX.MrlMX Maerl beds (muddy mixed sediments) narrower
MNCR BioMar 97.06 (Britain & Ireland) IGS.Mrl Maerl beds (open coast/clean sediments) narrower
MNCR BioMar 96.7 (Britain & Ireland) IGS.SwMrl   same
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