Abstract
Abstract. The male green treefrog, Hyla cinerea, has two signals in its vocal repertoire, the advertisement call and the aggressive call. These vocalizations are similar in frequency composition, but differ in their rate of amplitude modulation (waveform periodicity). The ability of male green treefrogs to respond to signals differing in modulation rate and depth was tested with an evoked-calling paradigm. Males were significantly more likely to vocalize in response to playbacks of stimuli modulated at the waveform periodicity of the conspecific advertisement call, and less likely to vocalize in response to stimuli modulated at the rate of the conspecific aggressive call, or to stimuli modulated at the rate of a heterospecific advertisement call. Male vocal responses showed similar changes with modulation rate in response to either modulated calls (containing both spectral and temporal cues) and modulated noise (containing temporal cues alone). Decreasing the modulation depth eliminated the effect of modulation rate on the males' vocal responses. Changes in responding with modulation rate were consistent across both field and laboratory conditions. These results suggest that the temporal feature of amplitude modulation plays an important role in call recognition in the natural environment.
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