The five‐note advertisement call (abbreviated as “AC”) is common in natural recordings, with an average duration of 2 s (Zhu, Wang, Brauth, et al., 2017). Our experiments shared several stimulus types in common, including the five‐note advertisement call (“AC”) and the advertisement call with the second (“AN2”), third (“AN3”) or fourth note (“AN4”) replaced by white noise (Figure 2). The frequency of experimental noise ranged from 1.0 to 10.0 kHz, which spanned all sensitive hearing range of K. odontotarsus (Zhu, Wang, Brauth, et al., 2017). The relative amplitude of white noise was −10.0 dB to the fifth note in each call, and the mean durations were 251.8 ± 15.3 ms, 242.7 ± 17.6 ms, and 240.5 ± 14.6 ms, respectively. In accordance with the work of Ringler et al. (2017), we used the “Inband Power” function in the software Raven Pro 1.6 (Bioacoustics Research Program 2011) to calculate the SNR of each noise‐impaired call. Our results showed that the SNR of each noise‐impaired call was very close, −5.87 ± 0.82 dB. All stimuli used in the experiments were constructed with natural calls by Adobe Audition 3.0 software (Adobe Systems Inc.; 44.1 kHz, 16 bits) and have equivalent call duration, 2 s on average. To minimize the effect of pseudoreplication, six advertisement calls derived from six different calling males were used to generate stimuli. These six natural calls from different individuals may reflect the call properties of the mean population values. When each female or male frog participated in the experiment, one of the six stimulus pairs from different males was randomly selected.

Spectrograms and relative amplitude of each acoustic stimulus. “AC,” five‐note advertisement call; “AN2,” advertisement call with the second note replaced by noise; “AN3,” advertisement call with the third note replaced by noise; “AN4,” advertisement call with the fourth note replaced by noise. The grayscale spectrogram indicates the frequency components of each stimulus. The purple line indicates the relative amplitude of each stimulus

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