<p>Birds use their song to attract mates and repel rivals; therefore, their fitness depends strongly on efficient song transmission. However, an environment full of other sounds from various sources, including signals of other animals and increasing noise of human activities, can substantially impair acoustic communication. To test the response of a wild population of common chiffchaffs to the introduction of artificial sounds that interfere and do not interfere with their songs, we conducted two playback experiments. In the first experiment, we compared the number and duration of songs produced by males during 5-minute periods of white noise matching entire frequency band of the species’ song, broadcast alternately with periods of silence. In the second experiment, we compared their song rate and duration of their songs during 5-minute periods of the same white noise, broadcast alternately with noise lower and higher in frequency than species-specific spectrum. Common chiffchaff males sang significantly fewer and slightly shorter songs during noise overlapping with their song frequency than during periods of silence or noise at frequencies higher or lower than their songs. Our results indicate that high-amplitude continuous noise fully interfering with species’ songs causes stronger constraining effect on vocal activity of common chiffchaffs than non-interfering noise. These findings, along with previous studies, show that the response to noise is species-specific, and the topic of variation among birds in the strategies used still requires additional testing.</p>

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Temporal avoidance of interfering noise by common chiffchaff

  • Emilia Sokołowska,
  • Agata Staniewicz,
  • Adrianna Muszyńska,
  • Michał Budka

摘要

Birds use their song to attract mates and repel rivals; therefore, their fitness depends strongly on efficient song transmission. However, an environment full of other sounds from various sources, including signals of other animals and increasing noise of human activities, can substantially impair acoustic communication. To test the response of a wild population of common chiffchaffs to the introduction of artificial sounds that interfere and do not interfere with their songs, we conducted two playback experiments. In the first experiment, we compared the number and duration of songs produced by males during 5-minute periods of white noise matching entire frequency band of the species’ song, broadcast alternately with periods of silence. In the second experiment, we compared their song rate and duration of their songs during 5-minute periods of the same white noise, broadcast alternately with noise lower and higher in frequency than species-specific spectrum. Common chiffchaff males sang significantly fewer and slightly shorter songs during noise overlapping with their song frequency than during periods of silence or noise at frequencies higher or lower than their songs. Our results indicate that high-amplitude continuous noise fully interfering with species’ songs causes stronger constraining effect on vocal activity of common chiffchaffs than non-interfering noise. These findings, along with previous studies, show that the response to noise is species-specific, and the topic of variation among birds in the strategies used still requires additional testing.