BIOTIC Species Information for Fucus distichus
Click here to view the MarLIN Key Information Review for Fucus distichus
Researched byNicola White Data supplied byMarLIN
Refereed byDr Graham Scott
Distribution and Habitat
Distribution in Britain & IrelandRestricted to northern shores of Scotland and north and west Ireland.
Global distributionNorway, northern Scotland, Iceland, Greenland, eastern North America from Labrador to Maine and the Pacific coast of America discontinuously from Alaska to California
Biogeographic rangeNot researched Depth rangeUpper eulittoral
MigratoryNon-migratory / Resident   
Distribution Additional InformationIn Britain and Ireland, Fucus distichus has only been recorded attached to bedrock in the mid to upper eulittoral zone on exposed rocky shores in northern Scotland and Ireland. It is thought to be prevented from growing further south due to its poor tolerance of desiccation and inability to compete with plants growing further down the shore. However, on the east coast of North America, Fucus distichus is only found in rock pools and is incapable of growing on emergent rock surfaces in the mid to upper eulittoral.

Substratum preferencesBedrock
Large to very large boulders
Physiographic preferencesOpen coast
Biological zoneUpper Eulittoral
Wave exposureExtremely Exposed
Very Exposed
Tidal stream strength/Water flowStrong (3-6 kn)
Moderately Strong (1-3 kn)
Weak (<1 kn)
Very Weak (negligible)
SalinityFull (30-40 psu)
Variable (18-40 psu)
Habitat Preferences Additional Information
Distribution References Rice & Chapman, 1985, Ang, 1991, JNCC, 1999, Norton, 1985, Hardy & Guiry, 2003,
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