EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A2 - Littoral sediment > A2.3 - Littoral mud > A2.31 - Polychaete/bivalve-dominated mid estuarine mud shores > A2.313 - Hediste diversicolor, Macoma balthica and Scrobicularia plana in littoral sandy mud

Hediste diversicolor, Macoma balthica and Scrobicularia plana in littoral sandy mud

English name: Hediste diversicolor, Macoma balthica and Scrobicularia plana in littoral sandy mud

Description (English)

Mainly mid shore mud or sandy mud subject to variable salinity on sheltered estuarine shores. Typically, the sediment is wet in appearance and has an anoxic layer below 1 cm depth. The surface of the mud has the distinctive 'crow's foot' pattern formed by the peppery furrow shell Scrobicularia plana. The infauna is additionally characterised by a range of polychaete and bivalve species, including the ragworm Hediste diversicolor, Pygospio elegans, Streblospio shrubsolii, Tharyx killariensis and the baltic tellin Macoma balthica. Oligochaetes, most notably Tubificoides benedii, and the spire shell Hydrobia ulvae may be abundant. Other species that sometimes occur in this biotope are the cockle Cerastoderma edule, the sand gaper Mya arenaria and the polychaetes Eteone longa and Nephtys hombergii.
Situation: This unit may occur on the same shores as units A2.311, A2.312, NhomAph, A2.3221 and A2.3222. Higher up on the shore, and/or further towards the head of the estuary, A2.3223 may occur, changing to A2.323 at the upper extreme of the estuary.
Temporal variation: Enteromorpha spp. and Ulva lactuca may form mats on the surface of the mud during the summer months, particularly in areas of nutrient enrichment.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A2.313
Bern Convention Included in a Resolution 4 habitat type at a higher level (A2.3)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Cerastoderma edule
Invertebrates Eteone longa
Invertebrates Hydrobia ulvae
Invertebrates Macoma balthica
Invertebrates Mya arenaria
Invertebrates Nephtys hombergii
Invertebrates Pygospio elegans
Invertebrates Scrobicularia plana
Invertebrates Streblospio shrubsolii
Invertebrates Tubificoides benedii
Algae Ulva lactuca
Species scientific name English common name Species group
Cerastoderma edule Invertebrates
Eteone longa Invertebrates
Hydrobia ulvae Invertebrates
Macoma balthica Invertebrates
Mya arenaria Invertebrates
Nephtys hombergii Invertebrates
Pygospio elegans Invertebrates
Scrobicularia plana Invertebrates
Streblospio shrubsolii Invertebrates
Tubificoides benedii Invertebrates
Ulva lactuca Algae

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LS.LMu.MEst.HedMacScr <I>Hediste diversicolor</I>, <I>Macoma balthica</I> and <I>Scrobicularia plana</I> in littoral 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 A2.313 Hediste diversicolor, Macoma balthica and Scrobicularia plana in littoral sandy mud same
EUNIS Habitat Classification 200308 A2.371 Hediste diversicolor, Macoma balthica and Scrobicularia plana in littoral sandy mud shores same
EUNIS Habitat Classification 200308 A2.361 Hediste diversicolor and Macoma balthica in sandy mud shores overlap
EUNIS Habitat Classification 200202 A2.371 Hediste diversicolor and Scrobicularia plana in reduced salinity mud shores same
EUNIS Habitat Classification 199910 A2.321 Hediste diversicolor and Scrobicularia plana in reduced salinity mud shores same
MNCR BioMar 97.06 (Britain & Ireland) LMU.Mu.HedScr Hediste diversicolor and Scrobicularia plana in reduced salinity mud shores same
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