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Vocal Adjustments in Purple Sunbird (Cinnyris asiaticus) at Noisy Habitats

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This study examines the purple sunbirds' (Cinnyris asiaticus) vocalizations in different habitats to assess the vocal adjustments made by the bird to avoid masking of its acoustic signals in noisy conditions. Sampling of acoustic signals of purple sunbird at different sites was done at sites with varying background noise levels by simultaneously recording the audio samples as .wav files, and the corresponding sound pressure levels. We identified twelve different types of vocal signals in purple sunbird based on their morphological appearance in the spectrogram. Correlation analysis between background noise levels and spectral parameters of most of these signals showed weak and statistically non significant association between them. However, a statistically significant positive association was found between song amplitude and background noise levels. While our results support the presence of Lombard effect in purple sunbird vocalizations in noisy conditions, they do not seem to suggest any associated changes in spectral content in such conditions.
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Document Type: Research Article

Publication date: March 1, 2019

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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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