Acoustically induced call modification in the white-lipped frog,Leptodactylus albilabris |
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| Institution: | 2. Department of Electrical Engineering and Computer Science, University of California, Berkeley, CA 94720, U.S.A.;3. Graduate Group in Bioengineering, University of California, Berkeley, CA 94720, U.S.A.;1. Research Centre for Psychology, School of Biological and Chemical Sciences, Queen Mary University of London, London, U.K.;2. Institut de recherche sur la biologie de l''insecte (IRBI), CNRS UMR 7261, Université François Rabelais de Tours, Tours, France;3. Université de Rennes 1, Campus de Beaulieu, Rennes, France;1. Department of Surgery, National Taiwan University Hospital, Hsin-Chu Branch, Hsinchu City, Taiwan;2. Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Hsinchu City, Taiwan;3. Department of Internal Medicine, National Taiwan University Hospital, Hsin-Chu Branch, Hsinchu City, Taiwan;4. Population Health Research Center and Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan;5. Department of Medical Imaging, National Taiwan University Hospital, Hsin-Chu Branch, Hsinchu City, Taiwan;6. Department of Advanced Therapy, Siemens Healthineers, Taipei, Taiwan |
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| Abstract: | The vocalization behaviour of Leptodactylus albilabris was investigated using field playback experiments. To assess the response of males to pre-recorded natural ‘chirp’ (advertisement call) and natural ‘chuckle” (aggressive call) stimuli of gradually increasing broadcast intensity, three parameters (intensity, dominant frequency and repetition rate) of the chirp call were analysed. Of the males tested, 69% showed a significant increase in chirp intensity with increased levels of both stimulus types. In response to playback of the chirp stimulus, males actively modified the dominant frequency of their chirp calls over a mean range of 91·42 Hz, and in one case as much as 400 Hz. Moreover, 12 of 17 males shifted the frequency of their call towards the dominant frequency of the chirp stimulus (2175 Hz) by either increasing or decreasing the dominant frequency of their chirp calls. In response to the natural chuckle stimulus, 83% of the males showed either a decrease or no significant change in the dominant frequency of their chirps. All eight males for which both the chirp frequency and intensity were analysed and that showed an increase in chirp intensity also showed a concomitant increase in chirp dominant frequency. These results are the first to document quantitatively the plasticity of advertisement call intensity and dominant frequency in an anuran. The possible effects of advertisement call modification on male mating success in L. albilabris is discussed. |
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