Spectral selectivity during phonotaxis: a comparative study in Neoconocephalus (Orthoptera: Tettigoniidae)

The Journal of Experimental Biology
Joshua A Deily, Johannes Schul

Abstract

The calls of male Neoconocephalus have most energy concentrated in a relatively narrow low-frequency band. In N. robustus this low-frequency band is centered around 7 kHz, whereas calls of N. nebrascensis and N. bivocatus have center frequencies close to 10 kHz. The importance of the position of the low-frequency band for female phonotaxis in these three species was determined using a walking compensator. Female N. robustus showed significant phonotaxis towards call frequencies from 5 to 10 kHz, and spectral selectivity towards higher frequencies did not change with stimulus amplitude. Significant responses in N. nebrascensis and N. bivocatus occurred at significantly higher frequency ranges than in N. robustus. In these species, spectral selectivity changed with stimulus amplitude; at 68 dB sound pressure level (SPL), upper cut-off frequency was significantly lower than at 80 dB SPL in both species. Adding a higher harmonic to the conspecific carrier frequency had a strong inhibitory effect on phonotaxis in N. robustus: at higher relative amplitudes of the harmonic, phonotaxis was completely suppressed. Adding a higher harmonic to the conspecific carrier frequency had a much weaker but significant inhibitory effect in N. nebra...Continue Reading

References

Sep 1, 1966·Journal of Insect Physiology·N Suga
Jun 1, 2000·Nature·P J FonsecaR M Hennig
Jul 15, 2004·Microscopy Research and Technique·R M HennigA Stumpner

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Citations

Jun 19, 2007·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Gerlinde Höbel, Johannes Schul
Nov 5, 2008·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Joshua A Deily, Johannes Schul
Jul 3, 2009·Journal of Neurophysiology·J D Triblehorn, J Schul
Jun 10, 2010·The Journal of Comparative Neurology·Tim Daniel Ostrowski, Andreas Stumpner
May 23, 2015·Proceedings. Biological Sciences·Jay J FalkRachel A Page

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