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SS.SMu.CFiMu.MegMax
Burrowing megafauna and Maxmuelleria lankesteri in circalittoral mud

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Habitat (physical) description

Distribution

 Salinity: Full (30-35 ppt), Variable (18-35 ppt) 
 Wave exposure: Sheltered, Very sheltered, Extremely sheltered 
 Tidal streams: Weak (>1 kn), Very weak (negligible) 
 Substratum: Mud 
 Zone: Circalittoral 
 Depth Band: 10-20 m, 20-30 m, 30-50 m, 50-100 m 
 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.
Distribution of habitat SS.SMu.CFiMu.MegMax  Burrowing megafauna and Maxmuelleria lankesteri in circalittoral mud
Distribution of habitat SS.SMu.CFiMu.MegMax Burrowing megafauna and Maxmuelleria lankesteri in circalittoral 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

In circalittoral stable mud distinctive populations of megafauna may be found. These typically include Nephrops norvegicus, Calocaris macandreae and Callianassa subterranea. Large mounds formed by the echiuran Maxmuelleria lankesteri are also frequent in this biotope. The seapen Virgularia mirabilis may occur occasionally in this biotope but not in the same abundance as SpnMeg to which MegMax is closely allied. Infaunal species may include Nephtys hystricis, Chaetozone setosa, Amphiura chiajei and Abra alba.

Situation

No situation data available.

Temporal variation

No temporal data available.

Similar biotopes

SS.SMu.CFiMu.SpnMegMegMax is found in similar habitats but has reduced numbers of seapens and a wider range of megafauna. It is unclear from the data examined which environmental factors separate these two biotopes although MegMax often occurs in slightly deeper water than SpnMeg.

Characterising Species

Taxa Frequency Typical Abundance % Contribution to similarity Abundance (no.2)
Virgularia mirabilis O 6
Cerianthus lloydii R 4
Maxmuelleria lankesteri F 13
Ophiodromus flexuosus P 1 18
Nephtys hystricis P 43 95
Chaetozone setosa P 21 81
Nephrops norvegicus F 24
Calocaris macandreae F 15
Jaxea nocturna P 1
Callianassa subterranea P 6
Pagurus bernhardus P 4
Liocarcinus depurator P 4
Carcinus maenas P 1
Buccinum undatum P 2
Mysella bidentata P 3 45
Abra alba P 7 57
Corbula gibba P 2 11
Asterias rubens R 2
Amphiura chiajei F 2
Amphiura chiajei P 23 51
Lesueurigobius friesii P 2
Pomatoschistus minutus P 2

Example photographs of biotope

No characteristic photos currently available. If you are able to provide a photograph of this biotope please contact .


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