EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A5 - Sublittoral sediment > A5.5 - Sublittoral macrophyte-dominated sediment > A5.51 - Maerl beds > A5.512 - Lithothamnion glaciale maerl beds in tide-swept variable salinity infralittoral gravel

Lithothamnion glaciale maerl beds in tide-swept variable salinity infralittoral gravel

English name: Lithothamnion glaciale maerl beds in tide-swept variable salinity infralittoral gravel

Description (English)

Upper infralittoral tide-swept channels of coarse sediment in full or variable salinity conditions support distinctive beds of Lithothamnion glaciale maerl 'rhodoliths'. Phymatolithon calcareum may also be present as a more minor maerl component. Associated fauna and flora may include species found in other types of maerl beds (and elsewhere), e.g. Pomatoceros triqueter, Cerianthus lloydii, Sabella pavonina, Chaetopterus variopedatus, Lanice conchilega, Mya truncata, Plocamium cartilagineum and Phycodrys rubens. Unit A5.512, however, also has a fauna that reflects the slightly reduced salinity conditions, e.g. Psammechinus miliaris is often present in high numbers along with other grazers such as chitons and Tectura spp. Hyas araneus, Ophiothrix fragilis, Ophiocomina nigra and the brown seaweed Dictyota dichotoma are also typically present at sites. In Scottish lagoons this biotope may show considerable variation but the community falls within the broad description defined here.
Situation: This biotope can often be found at the upper end of Scottish sealochs where the variable salinity of the habitat may not be immediately obvious.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A5.512
Bern Convention Included in a Resolution 4 habitat type at a higher level (A5)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Chaetopterus variopedatus
Algae Dictyota dichotoma
Invertebrates Hyas araneus
Invertebrates Lanice conchilega
Algae Lithothamnion glaciale
Invertebrates Mya truncata
Invertebrates Ophiocomina nigra
Invertebrates Ophiothrix fragilis
Algae Phycodrys rubens
Algae Phymatolithon calcareum
Algae Plocamium cartilagineum
Invertebrates Pomatoceros triqueter
Invertebrates Psammechinus miliaris
Invertebrates Sabella pavonina
Species scientific name English common name Species group
Chaetopterus variopedatus Invertebrates
Dictyota dichotoma Algae
Hyas araneus Invertebrates
Lanice conchilega Invertebrates
Lithothamnion glaciale Algae
Mya truncata Invertebrates
Ophiocomina nigra Invertebrates
Ophiothrix fragilis Invertebrates
Phycodrys rubens Algae
Phymatolithon calcareum Algae
Plocamium cartilagineum Algae
Pomatoceros triqueter Invertebrates
Psammechinus miliaris Invertebrates
Sabella pavonina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 SS.SMp.Mrl.Lgla <I>Lithothamnion glaciale</I> maerl beds in tide-swept variable salinity infralittoral gravel source
CORINE Land Cover 5.2.3. Sea and ocean n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A5.512 Lithothamnion glaciale maerl beds in tide-swept variable salinity infralittoral gravel same
EUNIS Habitat Classification 200308 A4.612 Lithothamnion glaciale maerl beds in tide-swept variable salinity infralittoral gravel same
EUNIS Habitat Classification 200202 A4.612 Lithothamnion glaciale maerl beds in tide-swept variable salinity shallow-water gravel same
EUNIS Habitat Classification 199910 A4.112 Lithothamnion glaciale maerl beds in tide-swept variable salinity shallow-water gravel same
MNCR BioMar 97.06 (Britain & Ireland) IGS.Mrl.Lgla Lithothamnion glaciale maerl beds in tide-swept variable salinity infralittoral gravel same
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