Hediste diversicolor and Streblospio shrubsolii in Atlantic littoral sandy mud
Mud and sandy mud shores in sheltered marine inlets and estuaries subject to variable or reduced salinity. The biotope is typically found on the mid and lower shores and is often associated with shallow layers of cobbles and pebbles in the sediment in the upper and mid estuary. The sediment is anoxic close to the surface and remains water saturated during low tide. The infaunal polychaete community is dominated by dense Hediste diversicolor, as well as species with a limited salinity range tolerance such as Streblospio shrubsolii and Manayunkia aestuarina. Oligochaetes, including Heterochaeta costata and Tubificoides benedii are often abundant, and the amphipod Corophium volutator is often common.
Situation: This unit may occur on the same shores as MA6-225, MA6-224, MA6-226 or MA6-2272. Higher up on the shore, and/or further towards the head of the estuary, MA6-2273 may occur, changing to Tben 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 MA62271|
|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
|Species scientific name||English common name||Species group|
|Classification||Code||Habitat type name||Relationship type|
|EUNIS Habitat Classification 2007 (revised descriptions 2012)||A2.3221||Hediste diversicolor and Streblospio shrubsolii in littoral sandy mud||same|
|Classification||Code||Habitat type name||Relationship type||Comment|
|EUNIS Habitat Classification 200410||A2.3221||Hediste diversicolor and Streblospio shrubsolii in littoral sandy mud||same|
|EUNIS Habitat Classification 200308||A2.372||Hediste diversicolor and Streblospio shrubsolii in sandy mud or soft mud shores||overlap|
|EUNIS Habitat Classification 200202||A2.372||Hediste diversicolor and Streblospio shrubsolii in sandy mud or soft mud shores||overlap|
|EUNIS Habitat Classification 199910||A2.322||Hediste diversicolor and Streblospio shrubsolii in sandy mud or soft mud shores||overlap|
|MNCR BioMar 97.06 (Britain & Ireland)||LMU.Mu.HedStr||Hediste diversicolor and Streblospio shrubsolii in sandy mud or soft mud shores||overlap|