EUNIS habitat classification 2017 > M - Marine benthic habitats > MA4 - Littoral mixed sediment > MA42 - Atlantic littoral mixed sediment > MA423 - Unvegetated Atlantic littoral mixed sediment > MA4232 - Hediste diversicolor in Atlantic littoral gravelly muddy sand and gravelly sandy mud

Hediste diversicolor in Atlantic 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 Limecola balthica (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 MA4-232and the corresponding muddy sediment biotopes. The boundaries may be very indistinct, with the MA4-232 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 MA4232
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

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

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A2.411 Hediste diversicolor in littoral gravelly muddy sand and gravelly sandy mud same
EUNIS Habitat Classification 200410 A2.41 Hediste diversicolor dominated gravelly sandy mud shores same
EUNIS Habitat Classification 200308 A2.41 Sheltered combination sediment shores wider
EUNIS Habitat Classification 200202 A2.41 Sheltered combination sediment shores wider
EUNIS Habitat Classification 199910 A2.43 Sheltered mixed sediment shores wider
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