Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Frogs in Helium: The Anuran Vocal Sac Is Not a Cavity Resonator

A. Stanley Rand and Robert Dudley
Physiological Zoology
Vol. 66, No. 5 (Sep. - Oct., 1993), pp. 793-806
Stable URL: http://www.jstor.org/stable/30163824
Page Count: 14
  • Read Online (Free)
  • Download ($19.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Frogs in Helium: The Anuran Vocal Sac Is Not a Cavity Resonator
Preview not available

Abstract

A widely cited yet unproven function for anuran vocal sacs is that of cavity resonance and call tuning during vocalization. Because resonant frequency is influenced by the speed of sound within the cavity, we replaced a substantial proportion of the air in the anuran vocal tract with heliox (80% He/20% O₂), a medium in which the speed of sound is approximately 75% faster than in a normal atmosphere. Such a manipulation will increase energy in higher call frequencies, provided that cavity resonance is present. In a heliox atmosphere, no consistent or predictable change in the frequency distribution of sound energy was observed in the advertisement calls of two hylids and one leptodactylid or in the release call of a bufonid. Therefore, the call characteristics of the anurans in this study do not arise from cavity resonance in the vocal sac or other supralaryngeal structures. The anuran vocal sac may have a variety of acoustic and nonacoustic functions, but that of cavity resonator can now be excluded in the species examined here and is unlikely to be found in other anurans.

Page Thumbnails

  • Thumbnail: Page 
793
    793
  • Thumbnail: Page 
794
    794
  • Thumbnail: Page 
795
    795
  • Thumbnail: Page 
796
    796
  • Thumbnail: Page 
797
    797
  • Thumbnail: Page 
798
    798
  • Thumbnail: Page 
799
    799
  • Thumbnail: Page 
800
    800
  • Thumbnail: Page 
801
    801
  • Thumbnail: Page 
802
    802
  • Thumbnail: Page 
803
    803
  • Thumbnail: Page 
804
    804
  • Thumbnail: Page 
805
    805
  • Thumbnail: Page 
806
    806