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Substrate-borne vibrational signals of the Consperse stink bug (Hemiptera: Pentatomidae)

Published online by Cambridge University Press:  02 April 2012

Heather L. McBrien  and
Jocelyn G. Millar
Heather L. McBrien
Affiliation:
Department of Entomology, University of California, Riverside, California 92521, United States of America
Jocelyn G. Millar*
Affiliation:
Department of Entomology, University of California, Riverside, California 92521, United States of America
*
2Corresponding author (e-mail: [email protected]).
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Abstract

There is increasing evidence that short-range reproductive behaviors of phytophagous pentatomid bugs are mediated by vibrational signals. These signals have not yet been examined for bugs in the genus Euschistus, which contains several species native to the Americas. Substrate-borne vibrational signals (songs) were recorded from both sexes of the Consperse stink bug, Euschistus conspersus Uhler, an economically important agricultural pest in western North America. Females produced two songs (FS-1 and FS-2), each consisting of a series of frequency-modulated pulses with a pulse duration of 352 ± 105 (mean ± SD) and 163 ± 36 ms, respectively. Males produced four distinct songs, two composed of frequency-modulated pulses (MS-1 and MS-3), one consisting of narrowband pulses (MS-2), and one composed of a series of 1–6 short pulses, many of which were fused to form distinct pulse trains (MS-4). For both males and females, songs consisting of very short, frequency-modulated pulses (FS-2 and MS-3), with a mean pulse duration <170 ms, were emitted when the other member of the pair was silent. Songs made up of longer, frequency-modulated pulses (FS-1 and MS-1) were produced spontaneously and in response to songs from conspecifics. Pulses of MS-2 were produced by a male once a duet with a female had been initiated. This song had no frequency modulation and a longer mean pulse repetition time than MS-1. The two female songs and three of the male songs (MS-1, MS-2, and MS-3) were produced during the calling phase of mating behavior. Pulse trains of MS-4 were emitted during close-range courtship. During copulation males produced intermittent pulses of MS-1, the function of which is unknown. Dominant frequencies of all songs ranged from 102 to 136 Hz, comparable with those of other pentatomid songs. Although there were superficial similarities in the song structures of E. conspersus when compared with those of other pentatomid species, the song repertoire of E. conspersus was distinct and unique.

Résumé

Il est de plus en plus démontré que le comportement reproducteur de courte portée chez les punaises Pentatomidae phytophages est régi par des signaux vibratoires. Ces signaux n'ont jamais été étudiés chez les punaises du genre Euschistus, qui regroupe plusieurs espèces indigènes des Amériques. Nous avons enregistré les signaux vibratoires transmis par le substrat (chants) de mâles et de femelles de la punaise puante, Euschistus conspersus Uhler, un ravageur d'importance économique pour l'agriculture dans l'ouest de l'Amérique du Nord. Les femelles émettent deux types de chant (FS-1 et FS-2) formés d'une série de pulsations, de fréquence modulée d'une durée de 352 ± 105 (moyenne ± écart type) et de 163 ± 36 ms. Les mâles émettent quatre types de chant, deux composés de séries de pulsations de fréquence modulée (MS-1 et MS-3), un autre, constitué de pulsations à bandes étroites (MS-2) et un dernier, formé de 1 à 6 pulsations courtes dont plusieurs se fusionnent en suites distinctes (MS-4). Chez les deux sexes, les chants composés de pulsations très courtes (FS-2 et MS-3), de fréquence modulée d'une durée moyenne de <170 ms, sont émis quand le partenaire de l'autre sexe est silencieux. Les chants composés de pulsations plus longues (FS-1 et MS-1), de fréquence modulée, sont produits spontanément ou en réponse aux chants d'insectes conspécifiques. Les pulsations de MS-2 sont produites par les mâles après le début d'un duo avec leur partenaire. Les pulsations de ce chant ne sont pas de fréquence modulée et la durée moyenne d'une pulsation répétée est plus longue que dans le cas de MS-1. Les deux chants des femelles et trois des chants des mâles (MS-1, MS-2 et MS-3) sont émis pendant la phase d'appel du comportement reproducteur. Les suites de pulsations de MS-4 sont émises durant la cour à courte distance. Durant l'accouplement, les mâles émettent des pulsations intermittentes de MS-1 dont le rôle reste à déterminer. Les fréquences dominantes dans tous les types de chant vont de 102 à 136 Hz et sont semblables à celles d'autres pentatomides. Bien qu'l y ait des similarités superficielles dans la structure des chants d'E. conspersus et ceux d'autres pentatomides, le répertoire de cette espèce est bien distinct et original.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 135 , Issue 4 , August 2003 , pp. 555 - 567
Copyright
Copyright © Entomological Society of Canada 2003

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