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Spiny Lobsters Stick and Slip to Make Sound

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Spiny Lobsters Stick and Slip to Make Sound. Patek SN. 2001. ... Stick and Slip Mechanism ( Ex: Bow and Violin). Washboard Mechanism. ... – PowerPoint PPT presentation

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Title: Spiny Lobsters Stick and Slip to Make Sound


1
Spiny Lobsters Stick and Slip to Make Sound
  • Patek SN. 2001. Spiny lobsters stick and slip to
    make sound. Nature 411153-154.

2
Spiny Lobster
Panulirus argus (modified from Summers, 2001)
Panulirus ornatus (Patek, 2001)
3
Frictional Mechanism
(modified from Patek,2001)
4
Purpose
  • Test which mechanism the palinurid lobsters
    (spiny lobsters) use to create sound.
  • Stick and Slip Mechanism ( Ex Bow and Violin).
  • Washboard Mechanism.
  • Put motion detector to the plectrum.
  • Hydrophone to record sounds.

Method
5
Sound Production
  • Only during sliding movements.
  • Only when plectrum moves posteriorly against the
    anteriorly projecting shingles.

6
Results
  • High speed video analysis showed shingle impacts
    (19,000-28,000 Hz) exceeding the average pulse
    rate (77 Hz).
  • Washboard mechanism would have shown equal pulse
    rates shingle impacts.
  • Electromyographic, acoustic and plectrum-movement
    recordings .
  • Showed promoter muscle contracting tonically
    during sound production.
  • Muscle contraction found to generate the series
    of sound pulses.
  • Manually sliding the plectrum over the file in a
    single motion produced a series of sound pulses.
  • Therefore, palinurid lobsters use the stick and
    slip mechanism

7
Stick and Slip Function
  • Lobsters rely on their hard spiny exoskeleton for
    protection.
  • The clicking sound startles predators.
  • Predators associate clicking sounds with the
    spiny exoskeleton .
  • Predators hear the sounds and back off, even if
    the lobster is molting and has a soft body.

8
References
  • Patek SN. 2001. Spiny lobsters stick and slip to
    make sound. Nature 411153-154.
  • Summers A. 2001. The Lobsters Violin. Natural
    History 11026-27.
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