EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A2 - Littoral sediment > A2.4 - Littoral mixed sediments > A2.41 - Hediste diversicolor dominated gravelly sandy mud shores > A2.411 - Hediste diversicolor in littoral gravelly muddy sand and gravelly sandy mud

Hediste diversicolor in littoral gravelly muddy sand and gravelly sandy mud

English name: Hediste diversicolor in littoral gravelly muddy sand and gravelly sandy mud

Description (English)

Sheltered gravelly sandy mud, subject to reduced salinity, mainly on the mid and lower shore. The infaunal community is dominated by abundant ragworms Hediste diversicolor. Other species of the infauna vary for the sub-biotopes described. They include polychaetes such as Pygospio elegans, Streblospio shrubsolii, and Manayunkia aestuarina, oligochaetes such as Heterochaeta costata and Tubificoides spp., the mud shrimp Corophium volutator, the spire shell Hydrobia ulvae, the baltic tellin Macoma balthica and the peppery furrow shell Scrobicularia plana. Sub-biotopes described as subunits of this unit have equivalent communities in soft muddy sediments, but the sediment here is much firmer due to the gravel component. There are relatively few records in each sub-type, leading to uncertainty over the precise nature of the habitat, particularly regarding sediment type and salinity regime.
Situation: It is probable that there are broad transition areas between the sub-biotopes of A2.411, and the corresponding muddy sediment biotopes. The boundaries may be very indistinct, with the A2.411 groups present in patches of gravelly mud on areas of mudflat where the main biotopes are their corresponding mud or sandy mud biotopes. Given the small number of records for each of the sub-biotopes, their spatial distribution is still uncertain.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A2.411
Bern Convention Included in a Resolution 4 habitat type at a higher level (A2.4)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Corophium volutator
Invertebrates Heterochaeta costata
Invertebrates Hydrobia ulvae
Invertebrates Macoma balthica
Invertebrates Manayunkia aestuarina
Invertebrates Pygospio elegans
Invertebrates Scrobicularia plana
Invertebrates Streblospio shrubsolii
Species scientific name English common name Species group
Corophium volutator Invertebrates
Heterochaeta costata Invertebrates
Hydrobia ulvae Invertebrates
Macoma balthica Invertebrates
Manayunkia aestuarina Invertebrates
Pygospio elegans Invertebrates
Scrobicularia plana Invertebrates
Streblospio shrubsolii Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LS.LMx.GvMu.HedMx <I>Hediste diversicolor</I> in littoral gravelly muddy sand and gravelly sandy mud source
CORINE Land Cover 4.2.3. Intertidal flats n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A2.411 Hediste diversicolor in littoral gravelly muddy sand and gravelly sandy mud same
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