Hediste diversicolor and Limecola balthica in littoral gravelly mud
Sheltered gravelly mud shores, subject to reduced salinity. The infaunal community consists of the ragworm Hediste diversicolor, as well as the spire shell Hydrobia ulvae and the baltic tellin Limecola balthica (Macoma balthica). The presence of the gravel in the sediment is unlikely to have a large influence on the infaunal composition, which is driven mainly by the estuarine sandy mud conditions. Coarse material on the sediment surface may however enrich the biota with additional epifaunal species such as barnacles and algae. Given the low sample numbers for this biotope, more records are needed to confirm the characterising species list.
Situation: It is probable that there are broad transition areas between this biotope, and the corresponding muddy sediment biotope, unit MA6-224. The boundaries may be very indistinct, with MA4-2321 present in patches of gravelly mud on areas of mudflat, where the main biotope is MA6-224. This biotope has been found alongside its mud equivalent in the Stour estuary.
Source: EUNIS habitat classification
|EUNIS habitat type||code MA42321|
|Relation to||Resolution 4 habitat type (used for designation of Emerald sites)|
Relation to other habitat types mentioned in legal instruments
Relation to vegetation types (syntaxa)Not available
Species mentioned in habitat description
|Classification||Code||Habitat type name||Relationship type|
|EUNIS Habitat Classification 2007 (revised descriptions 2012)||A2.4111||Hediste diversicolor and Macoma balthica in littoral gravelly mud||same|
|Classification||Code||Habitat type name||Relationship type||Comment|
|EUNIS Habitat Classification 200410||A2.4111||Hediste diversicolor and Macoma balthica in littoral gravelly mud||same|
|EUNIS Habitat Classification 200308||A2.415||Hediste diversicolor and Macoma balthica in poorly sorted mixed sediment shores||same|
|EUNIS Habitat Classification 200202||A2.415||Hediste diversicolor and Macoma balthica in poorly sorted mixed sediment shores||overlap|