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Behavioral Ecology Vol. 12 No. 3: 308-312
© 2001 International Society for Behavioral Ecology

Bidirectional communication system in katydids: the effect on chorus structure

Eran Tauber

Department of Cell and Animal Biology, The Hebrew University of Jerusalem, Israel

Address correspondence to E. Tauber, who is now at the Department of Genetics, University of Leicester, University Road, Leicester LE1 7RH, UK. E-mail: et22{at}leicester.ac.uk .

Unlike most acoustic systems evolved for pair formation where only males signal, the katydidPhaneroptera nana has a bidirectional communication system where both males and females sing. Despite extensive study on male chorusing behavior in different communication systems, this behavior has rarely been explored in duetting species. I examined how this bidirectional communication system affects the collective pattern of male signaling.P. nana males alternate their songs, and in response to synthetic stimuli delay their calls, according to the phase of stimulation. Pairs of synthetic calls (simulating alternating males) presented to females elicited equal female response, as long as the intercall interval was<= 200 ms. Thus, male alternation is imposed by the female's responsiveness and may be interpreted as a "jamming avoidance reaction." Further evidence suggests that chorus structure is not merely constrained by the female sensory temporal resolution, but rather is adaptively related to female choice in this species.

Key words: acoustic communication, chorusing, female choice, katydids, male signaling, Phaneroptera nana.


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