BIOTIC Species Information for Metridium senile
Researched byDr Keith Hiscock & Emily Wilson Data supplied byMarLIN
Refereed byThis information is not refereed.
Distribution and Habitat
Distribution in Britain & IrelandAll British and Irish coasts.
Global distributionSee additional information below.
Biogeographic rangeNot researched Depth rangeLower shore to considerable depths.
MigratoryNon-migratory / Resident   
Distribution Additional InformationThe species occurs from Biscay to Scandinavia in the northeast Atlantic. It is unknown from the western basin of the Mediterranean but recorded from the Adriatic (where it is believed to have been introduced) (Manual 1988). The same species occurs on the west and east coasts of North America. It has recently (Griffiths et al., 1996) been reported from Table Bay Harbour in South Africa where it was probably introduced from Europe. Both dianthus and pallidum forms may occur in estuaries and pallidum in brackish creeks. Braber & Borghouts (1977) recorded Metridium senile from salinities as low as 10ppt Chlorinity (about 19psu) in the Delta Region of the Netherlands.

Substratum preferencesBedrock
Large to very large boulders
Biogenic reef
Artificial (e.g. metal/wood/concrete)
Physiographic preferencesOffshore seabed
Strait / sound
Ria / Voe
Biological zoneSublittoral Fringe
Upper Infralittoral
Lower Infralittoral
Upper Circalittoral
Lower Circalittoral
Wave exposureExtremely Exposed
Very Exposed
Moderately Exposed
Very Sheltered
Extremely Sheltered
Tidal stream strength/Water flowVery Strong (>6 kn)
Strong (3-6 kn)
Moderately Strong (1-3 kn)
SalinityFull (30-40 psu)
Habitat Preferences Additional Information
Distribution References Hayward & Ryland, 1995b, Manuel, 1988, Griffiths et al., 1996, Braber & Borghouts, 1977,
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