Summary
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1.
The steering responses of three species of field crickets,Teleogryllus oceanicus, T. commodus, andGryllus bimaculatus, were characterized during tethered flight using single tonepulses (rather than model calling song) presented at carrier frequencies from 3–100 kHz. This range of frequencies encompasses the natural songs of crickets (4–20 kHz, Fig. 1) as well as the echolocation cries of insectivorous bats (12–100 kHz).
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2.
The single-pulse stimulus paradigm was necessary to assess the aversive nature of high carrier frequencies without introducing complications due to the attractive properties of repeated pulse stimuli such as model calling songs. Unlike the natural calling song, single tone-pulses were not attractive and did not elicit positive phonotactic steering even when presented at the calling song carrier frequency (Figs. 2, 3, and 9). In addition to temporal pattern, phonotactic steering was sensitive to carrier frequency as well as sound intensity. Three discrete flight steering behaviors (1)positive phonotaxis, (2)negative phonotaxis and (3)evasion, were elicited by appropriate combinations of frequency, temporal pattern and sound intensity (Fig. 12). Positive phonotactic steering required a model calling song temporal pattern, was tuned to 5 kHz and was restricted to frequencies below 9 kHz. Negative phonotactic steering, similar to the ‘early warning’ bat-avoidance behavior of moths, was produced by low intensity (55 dB SPL) tone-pulses at frequencies between 12 and 100 kHz (Figs. 2, 3, and 9). In contrast to model calling song, single tone-pulses of high intensity 5–10 kHz elicited negative phonotactic steering; low intensity ultrasound (20–100 kHz) produced only negative phonotactic steering, regardless of pulse repetition pattern. ‘Evasive’, side-to-side steering, similar to the ‘last-chance’ bat-evasion behavior of moths was produced in response to high intensity (> 90 dB) ultrasound (20–100 kHz).
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3.
Since the demonstration of negative phonotactic steering did not require the use of a calling song temporal pattern, avoidance of ultrasound cannot be the result of systematic errors in localizing an inherently attractive stimulus when presented at high carrier frequencies. Unlike attraction to model calling song, the ultrasound-mediated steering responses were of short latency (25–35 ms) and were produced in an open loop manner (Fig. 4), both properties of escape behaviors. The ultrasound-mediated steering behaviors were produced in response to a variety of synthetic acoustic stimuli resembling bat biosonar, e.g. short ultrasonic pulses (as short as 1 ms), repetition rates from 1–500 pps and frequencies from 15 to 100 kHz (Figs. 5, 6), and were strikingly similar to the bat-escape behaviors of moths.
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4.
Like moths, flying crickets steered away from low intensity ultrasound indicative of distant bats (10–18 m away), but produced the ‘evasive’ steering in response to high intensity ultrasound indicative of a closely approaching bat at 1–2 m. Theoretical calculations of ultrasound transmission predict that crickets can detect and avoid ultrasound at distances on the order of tens of meters, well beyond the detection abilities of bats for insect-size objects (less than 5 m) (Fig. 11). The ultrasound-mediated steering behavior of flying crickets is well suited to bat-avoidance. This study demonstrates that acoustically mediated steering in flying crickets is more diverse and more complex than previously thought.
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Abbreviations
- SPL :
-
sound pressure level
- LRTB :
-
Left/Right Threshold Bias
- BTD :
-
Binaural Threshold Difference
- DLMs :
-
Dorsal Longitudinal Muscles
- CS :
-
calling song
- CI :
-
confidence interval
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Nolen, T.G., Hoy, R.R. Phonotaxis in flying crickets. J. Comp. Physiol. 159, 423–439 (1986). https://doi.org/10.1007/BF00604163
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DOI: https://doi.org/10.1007/BF00604163