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Acoustic Analyses of the Calls of Crested Ibis in China

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The Crested Ibis (Nipponia nippon) is one of the most seriously endangered bird in the world today, and now it is only survival in China. To date, however, no study on the acoustic parameters of crested ibis calls has been conducted. In the paper quantitative analyses of four kinds of the crested ibis calls in China had been investigated: the call of nestling, the call of young crested ibis and the call of adult crested ibis (contact call and alert call). The calls were analyzed in the time and frequency domain using digital signals processing technology by computer. The characteristics of every kind of calls were extracted. The results show that the call of nestling is monotonous. There is no principal frequency. The main frequency range is 500–6000 Hz. The shape of its spectrogram is like a needle. The amplitude of the call of the young crested ibis is small. The main frequency range is 170–1800 Hz. The spectrum is composed of multiple harmonics. The main frequency range of the contact call of the adult crested ibis is 130–1600 Hz. Its spectrogram is again a multi-harmonic spectrum. The shape of the frequency bands in the spectrogram resembles an arch. The amplitude of the alert call of the adult crested ibis is high. There are many pulses in a call. The main frequency range is 140–2200 Hz. Its spectrogram is a multi-harmonic spectrum. This research is useful for the protection of the crested ibis and provides a scientific basis for bionomics research of the crested ibis. The quantitative research on the calls also delivers new data for the bird sound database.
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Document Type: Research Article

Publication date: September 1, 2007

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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