Hediste diversicolor and Corophium volutator in Atlantic littoral mud
Sheltered estuarine shores of sandy mud, which may become firm and compacted if present in the upper shore where there is more time for drainage between high tides. An anoxic layer is usually present within the first 5 cm of the sediment. The infauna is very sparse, usually only the ragworm Hediste diversicolor and the amphipod Corophium volutator are present in any abundance. Occasionally, oligochaetes or the spire shell Hydrobia ulvae may be present. Corophium multisetosum may also be found. There may be organic pollution of the sediment.
Situation: This unit may occur on the same shores as units MA6-225, MA6-224, MA6-226, and MA6-2271. Higher up on the shore, and/or further towards the head of the estuary, MA6-2273 may occur, changing to MA6-228 at the upper extreme of the estuary.
Temporal variation: Enteromorpha spp. or Ulva lactuca may form mats on the surface of the sediment during the summer months, particularly in areas of freshwater influence and/or where there is nutrient enrichment.
Source: EUNIS habitat classification
|EUNIS habitat type||code MA62272|
|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)||A2.3222||Hediste diversicolor and Corophium volutator in littoral mud||same|
|Classification||Code||Habitat type name||Relationship type||Comment|
|EUNIS Habitat Classification 200410||A2.3222||Hediste diversicolor and Corophium volutator in littoral mud||wider|
|EUNIS Habitat Classification 200410||A2.34||Corophium spp. in soft mud shores||wider|
|EUNIS Habitat Classification 200308||A2.373||Hediste diversicolor and oligochaetes in low salinity mud shores||overlap|
|EUNIS Habitat Classification 200202||A2.373||Hediste diversicolor and oligochaetes in low salinity mud shores||overlap|
|EUNIS Habitat Classification 199910||A2.323||Hediste diversicolor and oligochaetes in low salinity mud shores||overlap|
|MNCR BioMar 97.06 (Britain & Ireland)||LMU.Mu.HedOl||Hediste diversicolor and oligochaetes in low salinity mud shores||overlap|