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Spiny Lobsters Stick and Slip to Make Sound

Spiny Lobsters Stick and Slip to Make Sound. Patek SN. 2001. Spiny lobsters stick and slip to make sound. Nature 411 :153-154. Spiny Lobster. Panulirus ornatus (Patek, 2001). Panulirus argus (modified from Summers, 2001). Frictional Mechanism. (modified from Patek,2001). Purpose.

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Spiny Lobsters Stick and Slip to Make Sound

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  1. Spiny Lobsters Stick and Slip to Make Sound Patek SN. 2001. Spiny lobsters stick and slip to make sound. Nature 411:153-154.

  2. Spiny Lobster Panulirus ornatus (Patek, 2001) Panulirus argus (modified from Summers, 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. Only during sliding movements. Only when plectrum moves posteriorly against the anteriorly projecting shingles. Sound Production

  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 411:153-154. • Summers A. 2001. The Lobster’s Violin. Natural History 110:26-27.

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