EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A5 - Sublittoral sediment > A5.2 - Sublittoral sand > A5.24 - Infralittoral muddy sand > A5.244 - Spisula subtruncata and Nephtys hombergii in shallow muddy sand

Spisula subtruncata and Nephtys hombergii in shallow muddy sand

English name: Spisula subtruncata and Nephtys hombergii in shallow muddy sand

Quick facts

EUNIS habitat type code A5.244
Bern Convention Included in a Resolution 4 habitat type at a higher level (A5)

Description (English)

In shallow non-cohesive muddy sands, in fully marine conditions, a community characterised by the bivalve Spisula subtruncata and the polychaete Nephtys hombergii may occur. The sediments in which this community is found may vary with regard silt content but they generally have less than 20% silt/clay and in some areas may contain a degree of shell debris. This biotope falls somewhere between A5.242 and A5.261 with regard sediment type (i.e. somewhat muddier than A5.242 and less muddy than A5.261) and may have species in common with both. As a result, other important species in this community include Abra alba, Fabulina fabula spp. and Mysella bidentata spp. In addition, Diastylis rathkei/typical, Philine aperta (in muddier sediments), Ampelisca spp., Ophiura albida, Phaxas pellucidus and occasionally Bathyporeia spp, may also be important, although this is not clear from the data available. In areas of slightly coarser, less muddy sediment S. solida or S. elliptica may appear occasionally in this biotope. Abundances of Spisula subtruncata in this biotope are often very high and distinguish it from other closely related biotopes. Extensive areas of this community to the north east of the Dogger Bank were recorded in the 1950s, but these seem to have declined since then (Kroncke 1990). More information is required with regard the status of this biotope.
Temporal variation: In some areas this biotope may be a temporal variant or sub-biotope of A5.242 and A5.261 rather than an established biotope in itself. For example A5.244 has been recorded in Red Wharf Bay and Conwy Bay where it appears to be short term variant of other more established biotopes (e.g. A5.261) and appears to have only intermittent occurrence in single age cohort patches possibly due to predation in some areas (e.g. Red Wharf Bay) by the common Scoter Melanitta nigra (E.I.S. Rees pers. comm. 2002).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Abra alba
Birds Melanitta nigra
Invertebrates Mysella bidentata
Invertebrates Nephtys hombergii
Invertebrates Ophiura albida
Invertebrates Phaxas pellucidus
Invertebrates Philine aperta
Invertebrates Spisula subtruncata
Species scientific name English common name Species group
Abra alba Invertebrates
Melanitta nigra Common Scoter Birds
Mysella bidentata Invertebrates
Nephtys hombergii Invertebrates
Ophiura albida Invertebrates
Phaxas pellucidus Invertebrates
Philine aperta Invertebrates
Spisula subtruncata Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 SS.SSa.IMuSa.SsubNhom <I>Spisula subtruncata</I> and <I>Nephtys hombergii</I> in shallow muddy sand 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 A5.244 Spisula subtruncata and Nephtys hombergii in shallow muddy sand same
EUNIS Habitat Classification 200308 A4.112 Spisula elliptica and venerid bivalves in infralittoral clean sand or shell gravel wider
EUNIS Habitat Classification 200202 A4.112 Spisula elliptica and venerid bivalves in infralittoral clean sand or shell gravel overlap
EUNIS Habitat Classification 199910 A4.122 Spisula elliptica and venerid bivalves in infralittoral clean sand or shell gravel overlap
MNCR BioMar 97.06 (Britain & Ireland) IGS.FaG.Sell Spisula elliptica and venerid bivalves in infralittoral clean sand or shell gravel overlap
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100