Song amplitude affects territorial aggression of male receivers in chaffinches

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On the relationship between, and measurement of, amplitude and frequency in birdsong (2012, background): “…mPa) which seems a reasonable estimate based on published calibrated measurements of birdsong amplitudes (Dabelsteen 1981; Nelson 2000; Brumm 2009; Brumm & Ritschard 2011), a difference of 48 dB would mean that some syllables would have been 24 dB greater in amplitude, and others 24 dB less than…”
Not so sexy in the city: urban birds adjust songs to noise but compromise vocal performance (2016, unknown): “Higher amplitude songs elicit stronger responses in both male and female birds (Searcy 1996; Brumm and Ritschard 2011).”
Fitness costs as well as benefits are important when considering responses to anthropogenic noise (2014, background): “Moreover, because mate choice and male–male competition are often based on assessments of song characteristics, with higher quality indicated by such aspects as high amplitude (Brumm and Ritschard 2011; but see Nemeth et al.”