Phymatolithon calcareum maerl beds in infralittoral clean gravel or coarse sand
Quick facts
EUNIS habitat type | code A5.511 |
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Bern Convention | Included in a Resolution 4 habitat type at a higher level (A5) |
Description (English)
Maerl beds characterised by Phymatolithon calcareum in gravels and sands. Associated epiphytes may include red algae such as Dictyota dichotoma, Halarachnion ligulatum, Callophyllis laciniata, Cryptopleura ramosa, Brongniartella byssoides and Plocamium cartilagineum. Algal species may be anchored to the maerl or to dead bivalve shells amongst the maerl. Polychaetes, such as Chaetopterus variopedatus, Lanice conchilega, Kefersteinia cirrata, Mediomastus fragilis, Chone duneri, Parametaphoxus fultoni and Grania may be present. Gastropods such as Gibbula cineraria, Gibbula magus, Calyptraea chinensis Dikoleps pusilla and Onoba aculeus may also be present. Liocarcinus depurator and Liocarcinus corrugatus are often present, although they may be under-recorded; it would seem likely that robust infaunal bivalves such as Circomphalus casina, Mya truncata, Dosinia exoleta and other venerid bivalves are more widespread than available data currently suggests. It seems likely that stable wave-sheltered maerl beds with low currents may be separable from A5.511; having a generally thinner layer of maerl overlying a sandy /muddy substratum with a diverse cover of epiphytes (e.g. Bosence 1976; Blunden et al. 1977; 1981; Davies & Hall-Spencer 1996) but insufficient data currently exists on a national scale. Wave and current-exposed maerl beds, where thicker depths of maerl accumulate, frequently occur as waves and ridge / furrows arrangements (see Bosence 1976; Blunden et al. 1977; 1981; Irvine & Chamberlain 1994; Hall-Spencer 1995). At some sites where A5.511occurs, there may be significant patches of maerl gravel containing the rare burrowing anemone Halcampoides elongatus; this may be a separate biotope, but insufficient data exists at present. Northern maerl beds in the UK do not appear to contain L. corallioides but in south-west England and Ireland L. corallioides may occur to some extent in A5.511 as well as A5.513, where it dominates.
Source: EUNIS habitat classification
Vegetation types
Relation to vegetation types (syntaxa)
Not availableSpecies mentioned in habitat description
Species scientific name | English common name | Species group |
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Phymatolithon calcareum | Algae | |
Plocamium cartilagineum | Algae | |
Calyptraea chinensis | Invertebrates | |
Gibbula magus | Invertebrates | |
Lanice conchilega | Invertebrates | |
Liocarcinus corrugatus | Invertebrates | |
Liocarcinus depurator | Invertebrates | |
Mya truncata | Invertebrates | |
Onoba aculeus | Invertebrates |
Other classifications
Classification | Code | Habitat type name | Relationship type |
---|---|---|---|
Marine Habitat Classification Britain/Ireland 0405 | SS.SMp.Mrl.Pcal | <I>Phymatolithon calcareum</I> maerl beds in infralittoral clean gravel or coarse sand | source |
CORINE Land Cover | 5.2.3. | Sea and ocean | n/a |
History
Classification | Code | Habitat type name | Relationship type |
---|---|---|---|
EUNIS Habitat Classification 200410 | A5.511 | Phymatolithon calcareum maerl beds in infralittoral clean gravel or coarse sand | same |
EUNIS Habitat Classification 200308 | A4.611 | Phymatolithon calcareum maerl beds in infralittoral clean gravel or coarse sand | same |
EUNIS Habitat Classification 200202 | A4.611 | Phymatolithon calcareum maerl beds in shallow-water clean gravel or coarse sand | same |
EUNIS Habitat Classification 199910 | A4.111 | Phymatolithon calcareum maerl beds in shallow-water clean gravel or coarse sand | same |
MNCR BioMar 97.06 (Britain & Ireland) | IGS.Mrl.Phy | Phymatolithon calcareum maerl beds in infralittoral clean gravel or coarse sand | same |