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First published online August 31, 2007
Journal of Experimental Biology 210, 3160-3164 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.008136
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Flight and hearing: ultrasound sensitivity differs between flight-capable and flight-incapable morphs of a wing-dimorphic cricket species

Gerald S. Pollack* and Ruben Martins

Department of Biology, McGill University, 1205 Avenue Docteur Penfield, Montreal, QC, H3A 1B1, Canada


Figure 1
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  		Fig. 1. Examples of positive and negative phonotactic steering responses in crickets. Traces reflect abdominal position; upward deflections indicate movements to the right. (A) Response to a model of the species' calling song, broadcast from the cricket's right at 60 dB SPL (indicated by horizontal bar). The broken line indicates the threshold level for detection of a response (mean +4 s.d. of pre-stimulus position). (B) Response of the same cricket to a single, 30 kHz pulse (indicated by the horizontal bar above the trace) presented from the right at 80 dB SPL. The broken line shows mean pre-stimulus position –4 s.d. Note the difference in time scale from A.

 

Figure 2
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  		Fig. 2. Thresholds for phonotactic steering responses of long- and short-winged crickets for a model of the species' calling song with the species-typical carrier frequency (5.2 kHz) and for single 30 kHz sound pulses. Values are means ± s.e.m., N=10 for each wing morph. *Mean threshold differs significantly for 30 kHz (t-test, P=0.003), but not for 5.2 kHz (P=0.75).

 

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  		Fig. 3. ON1 tuning curves for crickets of three wing-muscle classes: short wings (SW); long wings, white muscles (LWW), and long wings, pink muscles (LWP). Only LWP individuals are capable of flight. Values are means ± s.e.m.; sample sizes: SW, 8; LWW, 7; LWP, 6.

 

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  		Fig. 4. AN2 tuning curves for crickets with short wings (SW; N=8), with long wings and white muscles (LWW; N=7), and with long wings and pink muscles (LWP; N=7) crickets. Values are means ± s.e.m.

 

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© The Company of Biologists Ltd 2007