En tambourinant avec leur abdomen sur le substrat, les mâles produisent un signal vibratoire à bande large de 20 dB (niveau de pression du son 0 dB = 20 µPa) au-dessus du son ambiant avec des fréquences dominantes de 115 ± 10 et de 175 ± 15 Hz et un patron temporel particulier.
Pour enregistrer ce signal, nous utilizons des ordinateurs munis de matériel et de logiciels de capture de données, des microphones sensibles aux fréquences soniques et (ou) ultrasoniques, des haut-parleurs piézoélectriques à membrane capables d’émettre des sons audibles et ultrasoniques ainsi que des appareils piézoélectriques capables de produire des vibrations de basse intensité et de basse fréquence. Nous testons l’hypothèse selon laquelle la punaise occidentale des cônes, Leptoglossus occidentalis Heidemann, utilize un signal vibratoire transmis par le substrat pour la communication à courte distance. The use of such a signal is consistent with reports on communication by other true bug species. occidentalis uses a substrate-borne vibratory signal for short-range communication. In two-choice field experiments, this signal emitted in the air by piezoelectric devices or transferred through a wire to lodgepole pine branches attracted more L.
In two-choice dowel experiments with hickory wood or lodgepole pine crossbeams, females (unlike males or nymphs) preferred played-back recordings of the same signal over controls. In two-choice arena experiments, males and females preferred the played-back recording of the male-produced substrate-borne signal over silent controls, whereas nymphs showed no preference for either stimulus. There was no evidence for ( i) ultrasonic signal components ( ii) signals produced by females or nymphs, or ( iii) repeated trains of signal pulses. By tapping their abdomen on substrate, males produced a wide-band vibratory signal 20 dB (sound pressure level 0 dB = 20 µPa) above ambient sound, with dominant frequencies of 115 ± 10 and 175 ± 15 Hz and a distinct temporal pattern. To record such a signal we used computers equipped with data-acquisition hardware and software, microphones sensitive to sonic and (or) ultrasonic frequencies, membrane-type and piezoelectric speakers capable of emitting sonic and ultrasonic sound, and piezoelectric devices capable of emitting low-level, low-frequency vibrations. We tested the hypothesis that the western conifer seed bug, Leptoglossus occidentalis Heidemann, uses a substrate-borne vibratory signal for short-range communication.
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