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Graded aggressive calls of the spring peeper pseudacris crucifer


, : Graded aggressive calls of the spring peeper pseudacris crucifer. Herpetologica 45(2): 172-181

Broadcasts of synthetic advertisement and aggressive calls to male spring peepers, Pseudacris crucifer, demonstrated that aggressive call duration is not a static feature. Frogs increased call duration as well as the number and proportion of aggressive calls that they gave in response to increases in stimulus intensity. Increases in the duration of aggressive call stimuli, independent of changes in sound intensity, also elicited elevations in call duration and other measures of aggressive response. Data on calling effort indicate that males may be energetically constrained during bouts of vocal activity, and that aggressive calls are given at the expense of advertisement calls if a male's calling effort is near its upper limit. Use of graded aggressive calls may be a form of honest signalling, enabling males to advertise their own endurance and assess that of potential opponents.

US$19.90

DOI: 10.2307/3892159


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