Call for Your Life: Acoustic Structure and Age‐Sex Differences in Distress Calls of Red‐Necked Nightjars DOI Creative Commons
Javier Sierro, Diego Gil, Pedro Sáez‐Gómez

et al.

Ethology, Journal Year: 2024, Volume and Issue: 130(12)

Published: Oct. 25, 2024

ABSTRACT Predatory interactions result in strong selection pressures acting on multiple aspects of animal behaviour. Anti‐predator strategies are therefore common most animals, typically signalling at various stages a predation event. Many species caprimulgids perform conspicuous anti‐predator displays, including stereotyped behaviours and vocal signals. Here, we described distress calls red‐necked nightjars ( Caprimulgus ruficollis ), produced when birds trapped unable to escape during predatory interaction. Distress harsh, low‐frequency guttural vocalisations with irregular amplitude modulations. The age sex partially explained the acoustic variation observed, whereas size‐related morphological features were poor predictors structure. Age‐sex differences may respond physiological constraints associated sexual dimorphism and/or developmental variation. Alternatively, directional differential risk each age‐sex class have resulted observed calls. extremely deep voice harsh quality fit structure aggressive signals resemble those by larger animal. We propose that these serve as last resort strategy reduce post‐encounter predation, either startling effect facilitate or attract other predators could intimidate captor.

Language: Английский

Call for Your Life: Acoustic Structure and Age‐Sex Differences in Distress Calls of Red‐Necked Nightjars DOI Creative Commons
Javier Sierro, Diego Gil, Pedro Sáez‐Gómez

et al.

Ethology, Journal Year: 2024, Volume and Issue: 130(12)

Published: Oct. 25, 2024

ABSTRACT Predatory interactions result in strong selection pressures acting on multiple aspects of animal behaviour. Anti‐predator strategies are therefore common most animals, typically signalling at various stages a predation event. Many species caprimulgids perform conspicuous anti‐predator displays, including stereotyped behaviours and vocal signals. Here, we described distress calls red‐necked nightjars ( Caprimulgus ruficollis ), produced when birds trapped unable to escape during predatory interaction. Distress harsh, low‐frequency guttural vocalisations with irregular amplitude modulations. The age sex partially explained the acoustic variation observed, whereas size‐related morphological features were poor predictors structure. Age‐sex differences may respond physiological constraints associated sexual dimorphism and/or developmental variation. Alternatively, directional differential risk each age‐sex class have resulted observed calls. extremely deep voice harsh quality fit structure aggressive signals resemble those by larger animal. We propose that these serve as last resort strategy reduce post‐encounter predation, either startling effect facilitate or attract other predators could intimidate captor.

Language: Английский

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