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Selectivity of the peripheral auditory system of spadefoot toads (Scaphiopus couchi) for sounds of biological significance

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Summary

Scaphiopus couchi is a primitive anuran whose vocal repertoire consists of a mating call and a release call. The two calls are distinct and differ in trill rate. Reception of airborne sound is achieved by means of a poorly differentiated region of skin on the head which serves as an eardrum.

Whereas more modern anurans possessthree distinct types of auditory nerve fibers, spadefoot toads possess onlytwo types: a low-frequency-sensitive group which exhibits tone-on-tone inhibition and a high-frequency-sensitive group which is not inhibitable. The sharpness of frequency tuning of primary fibers in each group is comparable to more advanced vertebrate species. While the response properties of auditory fibers in the high-frequency-sensitive group are well matched to the spectral and temporal features in the spadefoot's mating call and release call, the low-frequency-sensitive fibers do not respond to these calls. Instead they may be involved in detection of bodily transmitted sounds during clasping, as well as other low-frequency sounds in the environment. The two groups of auditory fibers probably derive from separate auditory organs within the inner ear. Thresholds of auditory nerve fibers in spadefoot toads are relatively poorer than in more advanced anurans, which likely is due to their less developed eardrum. The role of tone-on-tone inhibition in the peripheral auditory system is questioned with regard to its significance in processing sounds of biological value.

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References

  • Awbrey, F. T.: Call discrimination in femaleScaphiopus couchii andScaphiopus hurterii. Copeia No. 2, 420–423 (1968)

    Google Scholar 

  • Baird, I. L.: The anatomy of the reptilian ear. In: The biology of the reptilia, vol. 2, Morph. B (Gans and Parsons, eds.), p. 193–275. New York: Academic Press 1970

    Google Scholar 

  • Balinsky, B. I.: Experimental embryology. Philadelphia: W. B. Saunders 1970

    Google Scholar 

  • Bergeijk, W. A. van: The evolution of vertebrate hearing. In: Contributions to sensory physiology, vol. 2 (W. D. Neff, ed.), p. 1–50. New York: Academic Press 1967

    Google Scholar 

  • Bergeijk, W. A. van, Witschi, E.: The basilar papilla of the anuran ear. Acta anat. (Basel)30, 81–91 (1957)

    Google Scholar 

  • Blair, W. F.: Differentiation of mating call in spadefoots, genusScaphiopus. Tex. J. Sci.7, 183–188 (1955)

    Google Scholar 

  • Bogert, C. M.: The influence of sound on the behavior of amphibians and reptiles. In: Animal sounds and communication (Lanyon and Tavolga, eds.), p. 137–320. Washington, D.C.: American Institute Biological Sciences 1960

    Google Scholar 

  • Boord, R. L., Grochow, L. B., Frishkopf, L. S.: Organization of the posterior ramus and ganglion of the VIIIth. cranial nerve of the bullfrogRana catesbeiana. M.I.T. Res. Lab. Electron. Quart. Prog. Rept.99, 180–182 (1971)

    Google Scholar 

  • Brown, H. A.: Embryonic temperature adaptation and genetic compatibility in two allopatric populations of the spadefoot toadScaphiopus hammondi. Evolution21, 742–761 (1967)

    Google Scholar 

  • Brown, H. E., Littlejohn, M. J.: Male release calls inBufo americanus group. In: Evolution of the genusBufo (W. F. Blair, ed.), p. 310–323. Austin: Univ. of Texas Press 1972

    Google Scholar 

  • Burlet, H. M. de: Vergleichend Anatomisches über endolymphatische und perilymphatische Sinnesendstellen des Labyrinthes. Acta oto.laryng. (Stockh.)22, 287–305 (1935)

    Google Scholar 

  • Capranica, R. R.: The evoked vocal response of the bullfrog: a study of communication by sound. Cambridge: M.I.T. Press 1965

    Google Scholar 

  • Capranica, R. R., Frishkopf, L. S., Nevo, E.: Encoding of geographic dialects in the auditory system of the cricket frog. Science182, 1272–1275 (1973)

    Google Scholar 

  • Capranica, R.R., Moffat, A. J. M.: Excitation, inhibition, and “disinhibition” in the inner ear of the toad (Bufo). J. acoust. Soc. Amer.55, 580 (1974A)

    Google Scholar 

  • Capranica, R. R., Moffat, A. J. M.: Evidence for mechanical origin of peripheral inhibition in the anuran inner ear. J. acoust. Soc. Amer.55, Suppl. S 85 (1974B)

    Google Scholar 

  • Capranica, R. R., Moffat, A. J. M.: Auditory responses from the saccule: further evidence for the mechanical origin of inhibition. J. acoust. Soc. Amer.56, Suppl. S 12 (1974C)

    Google Scholar 

  • Cochran, D. M.: Living amphibians of the world. Garden City: Doubleday 1961

    Google Scholar 

  • Feng, A. S., Narins, P. M., Capranica, R. R.: Three populations of primary auditory fibers in the bullfrog (Rana catesbeiana): their peripheral origins and frequency sensitivities. J. comp. Physiol.100, 221–229 (1975)

    Google Scholar 

  • Flock, å, Flock, B.: Ultrastructure of the amphibian papilla in the bullfrog. J. acoust. Soc. Amer.40, 1262 (1966)

    Google Scholar 

  • Frisch, K. von: über den Gehörsinn der Fische. Biol. Revs.11, 210–246 (1936)

    Google Scholar 

  • Frishkopf, L. S., Capranica, R. R., Goldstein, M. H.: Neural coding in the bullfrog's auditory system: a teleological approach. Proc. IEEE56, 969–980 (1968)

    Google Scholar 

  • Frishkopf, L. S., Flock, å.: Ultrastructure of the basilar papilla in the bullfrog. J. acoust. Soc. Amer.41, 1578 (1967)

    Google Scholar 

  • Frishkopf, L. S., Geisler, C. D.: Peripheral origin of auditory responses from the eighth nerve of the bullfrog. J. acoust. Soc. Amer.40, 469–472 (1966)

    Google Scholar 

  • Frishkopf, L. S., Goldstein, M. H., Jr.: Responses to acoustic stimuli from single units in the eighth nerve of the bullfrog. J. acoust. Soc. Amer.35, 1219–1228 (1963)

    Google Scholar 

  • Furukawa, T., Ishii, Y.: Neurophysiological studies on hearing in goldfish. J. Neurophysiol.30, 1377–1403 (1967)

    Google Scholar 

  • Geisler, C. D., van Bergeijk, W. A., Frishkopf, L. S.: The inner ear of the bullfrog. J. Morph.114, 43–58 (1964)

    Google Scholar 

  • Goldman, S.: Frequency analysis, modulation and noise. New York: Dover Publications 1948

    Google Scholar 

  • Kiang, N. Y-S., Watanabe, T., Thomas, E. C., Clark, L. F.: Discharge patterns of single fibers in the cat's auditory nerve. Cambridge: M.I.T. Press 1965

    Google Scholar 

  • Liff, H.: Responses from single auditory units in the eighth nerve of the leopard frog. J. acoust. Soc. Amer.45, 512–513 (1969)

    Google Scholar 

  • Loftus-Hills, J. J., Johnstone, B. M.: Auditory function, communication, and brain-evoked response in anuran amphibians. J. acoust. Soc. Amer.47, 1131–1138 (1970)

    Google Scholar 

  • Lombard, R. E.: A comparative morphological analysis of the salamander inner ear. Ph.D. thesis, University of Chicago (1971)

  • Lowe, C. H.: Isolating mechanisms in sympatric populations of southwestern anurans. Tex. J. Sci.6, 265–270 (1954)

    Google Scholar 

  • Martin, W. F.: Mechanics of sound production in toads of the genusBufo: passive elements. J. exp. Zool.176, 273–294 (1971)

    Google Scholar 

  • McAlister, W. H.: The vocal structures and method of call production in the genusScaphiopus hiolbrooki. Tex. J. Sci.11, 60–77 (1959)

    Google Scholar 

  • Moffat, A. J. M., Capranica, R. R.: Sensory processing in the peripheral auditory system of treefrogs (Hyla). J. acoust. Soc. Amer.55, 480 (1974)

    Google Scholar 

  • Noble, G. K.: The biology of the Amphibia. New York: Dover Publications 1954

    Google Scholar 

  • Robbins, R. G., Bauknight, R. S., Honrubia, V.: Anatomical distribution of efferent fibers in the VIIIth cranial nerve of the bullfrog (Rana catesbeiana). Acta oto-laryng. (Stockh.)64, 436–448 (1967)

    Google Scholar 

  • Ruibal, R., Tevis, L., Roig, V.: The terrestrial ecology of the spadefoot toadScaphiopus hammondi. Copeia3, 571–584 (1969)

    Google Scholar 

  • Sachs, M. B.: Responses to acoustic stimuli from single units in the eighth nerve of the green frog. J. acoust. Soc. Amer.36, 1956–1958 (1964)

    Google Scholar 

  • Sachs, M. B., Young, E. D., Lewis, R. H.: Discharge patterns of single fibers in the pigeon auditory nerve. Brain Res.70, 431–447 (1974)

    Google Scholar 

  • Schmidt, R. S.: Auditory receptors of two mating call-less anurans. Copeia No. 1, 169–170 (1970)

    Google Scholar 

  • Smith, C. A., Takasaka, T.: Auditory receptor organs of reptiles, birds and mammals. In: Contributions to sensory physiology, vol. 5 (W. D. Neff, ed.), p. 129–178. New York: Academic Press 1971

    Google Scholar 

  • Wasserman, A. O.: Factors affecting interbreeding in sympatric populations of spadefoots (genusScaphiopus). Evolution11, 320–338 (1957)

    Google Scholar 

  • Watkins, W. A.: The harmonic interval: fact or artifact in spectral analysis of pulse trains. In: Marine bioacoustics, vol. 2 (Tavolga, ed.), p. 15–43. New York: Pergamon 1967

    Google Scholar 

  • Wever, E. G.: Structure and function of the lizard ear. J. Aud. Res.5, 331–371 (1965)

    Google Scholar 

  • Zweifel, R. G.: Two pelobatid frogs from the tertiary of North America and their relationships to fossil and recent forms. Amer. Mus. Novit. No. 1762, 1–45 (1956)

    Google Scholar 

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Authors and Affiliations

  1. Section of Neurobiology and Behavior and School of Electrical Engineering, Cornell University, Ithaca, New York, USA

    Robert R. Capranica & Anne J. M. Moffat

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  1. Robert R. Capranica
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  2. Anne J. M. Moffat
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Additional information

We wish to dedicate this paper to Jasper J. Loftus-Hills who was killed in a tragic accident near Austin, Texas on June 11, 1974. His post-doctoral appointment in our laboratory and his assistance in collecting spadefoot toads in the field recall fond memories.

We also wish to thank R. Sage for helping us collect animals and W. F. Blair for supplying tape recordings ofScaphiopus mating calls. The assistance of J. Paton in photographing the animal in Fig. 1 is gratefully appreciated. This research was supported by the U.S. Public Health Service (NIH Research Grant NS-09244) and the National Science Foundation (Grant GB-18836); travel expenses involved in collecting animals were supported by a Cornell University Research Grant.

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Capranica, R.R., Moffat, A.J.M. Selectivity of the peripheral auditory system of spadefoot toads (Scaphiopus couchi) for sounds of biological significance. J. Comp. Physiol. 100, 231–249 (1975). https://doi.org/10.1007/BF00614533

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