Download
spiny lobsters stick and slip to make sound n.
Skip this Video
Loading SlideShow in 5 Seconds..
Spiny Lobsters Stick and Slip to Make Sound PowerPoint Presentation
Download Presentation
Spiny Lobsters Stick and Slip to Make Sound

Spiny Lobsters Stick and Slip to Make Sound

133 Vues Download Presentation
Télécharger la présentation

Spiny Lobsters Stick and Slip to Make Sound

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  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.