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LS.LMu.UEst.Hed.Cvol
Hediste diversicolor and Corophium volutator in littoral mud

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Habitat (physical) description

Distribution

 Salinity: Full (30-35 ppt), Reduced (18-30ppt), Variable (18-35 ppt) 
 Wave exposure: Sheltered, Very sheltered, Extremely sheltered 
 Tidal streams:  
 Substratum: Sandy mud 
 Zone:  
 Depth Band: Lower shore, Mid shore, Upper shore 
 Other Features:  

Download comparative physical and biological data. The comparative tables enable a rapid comparison of the species composition and principal physical characteristics between a given set of biotopes.

Previous code

This biotope occurred in previous versions of the classification as:
LMU.Mu.HedOl (part) - Version: 97.06
LMUD.HO - Version: 6.95

Distribution of habitat LS.LMu.UEst.Hed.Cvol  Hediste diversicolor and Corophium volutator in littoral mud
Distribution of habitat LS.LMu.UEst.Hed.Cvol Hediste diversicolor and Corophium volutator in littoral mud, based on records on the UK Marine Recorder database and EUSeaMap. Red dots represent records on which the biotope is based. Blue dots show other certain records, black dots show records tentatively assigned to this biotope. Yellow areas show level 2 and 3 sublittoral and deep-sea habitats prediced by EUSeaMap within UK waters.

Biotope description

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

Hed.Cvol may occur on the same shores as HedMacScr, HedMac, NhomAph, and Hed.Str. Higher up on the shore, and/or further towards the head of the estuary, Hed.Ol 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.

Similar biotopes

LS.LMu.UEst.Hed.OlOccurs under more reduced salinity conditions. The principal difference is the absence of C. volutator, and the occasional presence of Scrobicularia plana.
LS.LMu.UEst.NhomStrOccurs in sediments with a smaller sand fraction, with a higher diversity of polychaete and oligochaete species. C. volutator is absent.
LS.LMu.MEst.HedMacOccurs in similar physical environments. The infauna of this biotope is a lot more diverse, and dominated by a range of bivalves, including the Baltic tellin Macoma balthica, in addition to H. diversicolor and the occasionally abundant C. volutator.
LS.LMu.MEst.HedMacScrOccurs under similar, slightly more exposed conditions. The infauna is more diverse, with higher numbers of oligochaete and polychaete species, and the peppery furrow shell S. plana.
LS.LMu.UEst.Hed.StrOccurs under similar physical environments, slightly lower on the shore. The infauna is more diverse, with higher numbers of oligochaete and polychaete species, most notably Streblospio shrubsolii.

Characterising Species

Taxa Frequency Typical Abundance % Contribution to similarity Abundance (no.2)
Hediste diversicolor A 48 1783
Corophium volutator C 43 4257

Example photographs of biotope


Upper estuarine muddy creeks dominated by Hediste diversicolor and Corophium volutator., Dulas Bay sands., Paul Brazier, © JNCC
Click on an image for a larger view


Version 15.03 of the classification adds a deep-sea section to version 04.05; therefore superseding version 04.05, 97.06 and 03.02.

This online classification should be cited as:

JNCC (2015) The Marine Habitat Classification for Britain and Ireland Version 15.03 [Online]. [Date accessed]. Available from: jncc.defra.gov.uk/MarineHabitatClassification

Information from the shallower section (up to sublittoral sediment, taken from Version 04.05) be cited as the report accompanying Version 04.05, as follows:

CONNOR, D.W., J.H. ALLEN, N.GOLDING, K.L.HOWELL, L.M. LIEBERKNECHT, K.O. NORTHEN AND J.B. REKER (2004) The Marine Habitat Classification for Britain and Ireland Version 04.05. In: JNCC (2015) The Marine Habitat Classification for Britain and Ireland Version 15.03 [Online]. [Date accessed].
Available from: jncc.defra.gov.uk/MarineHabitatClassification
ISBN 1 861 07561 8


Information from the deep-sea section (added in March 2015) should be cited as the report accompanying the deep-sea section, as follows:

PARRY, M.E.V., K.L. HOWELL, B.E. NARAYANASWAMY, B.J. BETT, D.O.B. JONES, D.J. HUGHES, N. PIECHAUD, T.D. NICKELL, H. ELLWOOD, N. ASKEW, C. JENKINS and E. MANCA (2015) A Deep-sea Section for the Marine Habitat Classification of Britain and Ireland. JNCC report 530. In: JNCC (2015) The Marine Habitat Classification for Britain and Ireland Version 15.03 [Online]. [Date accessed].
Available from: jncc.defra.gov.uk/MarineHabitatClassification
ISSN 0963 8901