Echolocation signals and pinnae movement in the fruitbat Rousettus aegyptiacus

• Autorzy: Holland R.A. , Waters D. A.
• Języki publikacji: EN

Abstrakty

EN

The fruit bat Rousettus aegyptiacus has highly mobile pinnae. Little is known about the role that such movements play in sound localisation however and whether they interact with the process of echolocation in this species. Here we report the correspondence of echolocation signals in free flight with the downward wingbeat and forward movement of the pinnae, and demonstrate that the ears have a greater sensitivity to click stimuli in front of the animal when directed forwards than when back and to the side. The potential significance of the production of echolocation signals whilst the ears are moving from their least sensitive to their most sensitive position is discussed.

• Wydawca: -
• Czasopismo: Acta Chiropterologica
• Rocznik: 2005
• Tom: 07
• Numer: 1
• Opis fizyczny: p.83-90,fig.,ref.

Twórcy

autor

Holland R.A.

• School of Biology, University of Leeds, Leeds, LS2 9JT, U.K.

autor

Waters D. A.

Bibliografia

• Au, W. W. L., and K. J. Benolt-Bird. 2003. Automatic gain control in the echolocation system of dolphins. Nature, 423: 861-863.
• Boonman, A., and G. Jones. 2002. Intensity control during target approach in echolocating bats; stereotypical sensori-motor behaviour in Daubenton’s bats, Myotis daubentonii. Journal of Experimental Biology, 205: 2865-2874.
• Griffin, D. R., A. Novick, and M. Kornfield. 1958. The sensitivity of echolocation in the fruit bat Rousettus. Biological Bulletin, 155: 107-113.
• Griffin, D. R., D. C. Dunning, D. A. Cahlander, and F. A. Webster. 1962. Correlated orientation sounds and ear movements of horseshoe bats. Nature, 196: 1185-1186.
• Hartley, D. J. 1992. Stabilisation of perceived echo amplitudes in echolocating bats I. Echo detection and automatic gain control in the big brown bat, Eptesicus fuscus and the fishing bat, Noctilioleporinus. Journal of the Acoustical Society of America, 91: 1120-1132.
• Holland, R. A., D. A. Waters, and J. M. V. Rayner, 2004. Echolocation signal structure in the Megachiropteran bat Rousettus aegyptiacus (Geoffroy, 1810). Journal of Experimental Biology, 207: 4361-4369.
• Middlebrooks, J. C. 1992. Narrow-band sound localisation related to external ear differences. Journal of the Acoustical Society of America, 92: 2607-2604.
• Mogdans, J. J. Ostwald, and H.-U. Schnitzler, 1988. The role of pinna movement for the localisation of vertical and horizontal wire obstacles in the greater horseshoe bat, Rhinolopus ferrumequinum. Journal of the Acoustical Society of America, 84: 1676-1679.
• Möhres, F. P., and E. Kulzer. 1956. Über die Orientierung der Flughund (Chiroptera-Pteropodidae). Zeitschrift für Vergleichende Physiologie, 38: 1-29.
• Obrist, M. K., M. B. Fenton, J. L. Eger, and P. A. Schlegel. 1993. What ears do for bats: a comparative study of pinna sound pressure transformation in Chiroptera. Journal of Experimental Biology, 180: 119-152.
• Populin, L., and T. C. Yin. 1998. Pinna movement of the cat during sound localisation. Journal of Neuroscience, 18: 4233-4243.
• Pye, J. D., and L. H. Roberts. 1970. Ear movements in hipposiderid bats. Nature, 225: 285-286.
• Pye, J. D., M. Flinn, and A. Pye. 1962. Correlated orientation sounds and ear movements of horseshoe bats. Nature, 196: 1186-1188.
• Schnitzler, H.-U., and E. K. V. Kalko. 2001. Echolocation in insect eating bats. BioScience, 51: 557-569.
• Simmons, J. A., A. J. M. Moffat, and W. M. Masters. 1992. Sonar gain control and echo detection thresholds in the echolocating bat, Eptesicus fuscus. Journal of the Acoustical Society of America, 91: 1150-1163.
• Thurlow, W. R„ and P. S. Runge. 1967. Effect of induced head movements on localisation of direction of sounds. Journal of the Acoustical Society of America, 42: 480-488.
• Von Herbert, H. 1985. Echoortungsverhalten des Flughundes Rousettus aegyptiacus (Megachiroptera). Zeitschrift für Säugetierkunde, 50: 141-152.
• Walker, V. A., H. Peremans, and J. C. T. Hallam. 1998. One tone, two ears, three dimensions: a robotic investigation of pinnae movements used by rhinolophid and hipposiderid bats. Journal of the Acoustical Society of America, 104: 569-579.
• Waters, D. A., and C. Vollrath. 2003. Echolocation performance in the Echolocating fruit bat Rousettus aegyptiacus. Acta Chiropterologica, 5: 209-219.
• Young, E. D., J. J. Rice, and S. C. Tong. 1996. Effect of pinna position on head related transfer functions in the cat. Journal of the Acoustical Society of America, 99: 1-13.

Uwagi

PL