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Vocalizations and Acoustic Interactions of the Carpenter Frog, Rana virgatipes

Mac F. Given
Herpetologica
Vol. 43, No. 4 (Dec., 1987), pp. 467-481
Published by: Allen Press on behalf of the Herpetologists' League
Stable URL: http://www.jstor.org/stable/3892148
Page Count: 15
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Vocalizations and Acoustic Interactions of the Carpenter Frog, Rana virgatipes
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Abstract

Male carpenter frogs, Rana virgatipes, have a complex vocal repertoire consisting of a 1-10 note advertisement call, a single-note aggressive call, a multi-note aggressive call, a release call, and a growl given during wrestling. Females have a single-note call that is given during courtship. Dominant frequency and intensity of calls are correlated with body size, but the strength of the correlation decreases as body size increases. Calling activity occurs between sunset and sunrise, peaks around midnight, and is influenced by chorus density. Playback experiments were conducted using natural stimuli to investigate the response of territorial males to the proximity, size, and calling behavior of neighboring males. Males increased the number of aggressive calls as stimulus intensity increased and gave more aggressive responses to aggressive calls than to advertisement calls. When males were presented with calls of large and small males, they responded to the calls of the smaller male with more total notes and more single-note aggressive calls. Small males are more likely to retreat in response to a vocal intrusion.

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