Affiliation:
1. School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK
Abstract
SUMMARYMale field crickets emit pure-tone mating calls by rubbing their wings together. Acoustic radiation is produced by rapid oscillations of the wings, as the right wing (RW), bearing a file, is swept across the plectrum borne on the left wing (LW). Earlier work found the natural resonant frequency (fo) of individual wings to be different, but there is no consensus on the origin of these differences. Previous studies suggested that the frequency along the song pulse is controlled independently by each wing. It has also been argued that the stridulatory file has a variable fo and that the frequency modulation observed in most species is associated with this variability. To test these two hypotheses, a method was developed for the non-contact measurement of wing vibrations during singing in actively stridulating Gryllus bimaculatus. Using focal microinjection of the neuroactivator eserine into the cricket's brain to elicit stridulation and micro-scanning laser Doppler vibrometry, we monitored wing vibration in actively singing insects. The results show significantly lower fo in LWs compared with RWs, with the LW fo being identical to the sound carrier frequency (N=44). But during stridulation, the two wings resonate at one identical frequency, the song carrier frequency, with the LW dominating in amplitude response. These measurements also demonstrate that the stridulatory file is a constant resonator, as no variation was observed in fo along the file during sound radiation. Our findings show that, as they engage in stridulation, cricket wings work as coupled oscillators that together control the mechanical oscillations generating the remarkably pure species-specific song.
Publisher
The Company of Biologists
Subject
Insect Science,Molecular Biology,Animal Science and Zoology,Aquatic Science,Physiology,Ecology, Evolution, Behavior and Systematics
Reference35 articles.
1. The mechanics of stridulation in bush crickets (Tettigonioidea, Orthoptera). i. Tegminal generator;Bailey;J. Exp. Biol.,1970
2. The mechanism and efficiency of sound production in mole crickets;Bennet-Clark;J. Exp. Biol.,1970
3. Songs and the physics of sound production;Bennet-Clark,1989
4. Insect sound production: transduction mechanisms and impedance matching;Bennet-Clark;Symp. Soc. Exp. Biol.,1995
5. Size and scale effects as constraints in insect sound communication;Bennet-Clark;Philos. Trans. R. Soc. Lond. B,1998
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