Marine Biology

, Volume 84, Issue 3, pp 301–308 | Cite as

Byssus drifting and the drifting threads of the young post-larval mussel Mytilus edulis

  • D. J. W. Lane
  • A. R. Beaumont
  • J. R. Hunter


The long, drifting threads secreted by young post-larval mussels (Mytilus edulis L.) are simple monofilaments, distinct in form and function from the attachment byssus threads. The diameters of both thread types are in the micron or sub-micron range but, whereas the attachment threads are of restricted length and terminate in an attachment plaque, drifting threads exceed the post-larva in length by more than two orders in magnitude and are without plaques or any other structures. Transmission electron micrographs of drifting threads show no evidence of internal sub-structure. In contrast, attachment threads appear to be made up of filaments. These studies confirm that the drifting threads are highly effective in enhancing the dispersal of young mussels. The terminal sinking velocity of young drifters is typically ca. 1 mm s-1. At this velocity the suspension range above the sea bed, assuming given values of vertical diffusivity, is estimated to be 0.5 to 5 m. Calculations of the fluid drag experienced by post-larvae in the water column show that the theoretical viscous drag force on the thread is sufficient to account for the reduced sinking rate of drifters. The calculated contribution of the thread to the total drag is approximately one order of magnitude greater than that of the post-larval body. A rapid thread-deployment strategy, shown by post-larvae which are brought into suspension, may prolong each drifting excursion and thus further enhance dispersal in turbulent marine environments.


Mytilus Edulis Viscous Drag Total Drag Byssus Thread Sinking Rate 
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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • D. J. W. Lane
    • 1
  • A. R. Beaumont
    • 1
  • J. R. Hunter
    • 2
  1. 1.Marine Science LaboratoriesMenai Bridge, AngleseyNorth Wales, UK
  2. 2.Unit for Coastal and Estuarine StudiesMarine Science LaboratoriesMenai Bridge, AngleseyNorth Wales, UK

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