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Parasitism of adult Poecilus versicolor (Coleoptera: Carabidae) by hymenopteran larvae

Published online by Cambridge University Press:  03 January 2012

Kôji Sasakawa ,
Hiroshi Ikeda ,
Mitsuaki Sutou ,
Shigeto Dobata  and
Motomi Itô
Kôji Sasakawa*
Affiliation:
Laboratory of Plant Evolution and Biodiversity, Department of General Systems Studies, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
Hiroshi Ikeda
Affiliation:
Department of Forest Entomology, Forestry and Forest Products Research Institute, 1 Matsunosato Tsukuba, Ibaraki 305-8687, Japan
Mitsuaki Sutou
Affiliation:
Laboratory of Plant Evolution and Biodiversity, Department of General Systems Studies, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
Shigeto Dobata
Affiliation:
Laboratory of Subtropical Zoology, Department of Agro-Environmental Sciences, Faculty of Agriculture, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 903-0213, Japan
Motomi Itô
Affiliation:
Laboratory of Plant Evolution and Biodiversity, Department of General Systems Studies, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
*
1Corresponding author (e-mail: [email protected]).
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Abstract

We report the presence and effects of parasitoid larvae (Hymenoptera) in the carabid beetle Poecilus versicolor (Sturm). Dissection of one female and one male live host found 33 and 25 hymenopteran larvae, respectively. Although eggs were absent in the female host, likely because of consumption by parasitoids, distinct corpora lutea (present in parous females) were observed. In the male host, reproductive organs were undamaged. These observations suggest incomplete “parasitic castration” of the host beetle by the parasitoids. Parasitism rates in specimens from three localities were markedly low (0%–3.2%). At one locality, only one male and three female beetles containing parasitoids were found; those individuals each contained 9–27 larvae (mean 19.3). These results suggest that hymenopterous parasitoids in adult P. versicolor have little effect on the population dynamics of this beetle. The parasitoid larvae included two morphological types belonging to at least two taxa. Mitochondrial DNA analyses suggested that one of the types represented two species of Microctonus Wesmael (Braconidae: Euphorinae). The result of the genus-level identification, however, requires confirmation because the analyzed data set did not cover all braconid genera.

Résumé

Nous signalons la présence et les effets de larves parasitoïdes chez le carabe Poecilus versicolor (Sturm). La dissection d'un hôte vivant mâle et d'une femelle a révélé la présence respectivement de 33 et de 25 larves d'hyménoptères. Bien que les œufs aient été absents de l'hôte femelle, sans doute parce que consommés par les parasitoïdes, il y avait des corps jaunes distincts (caractéristique des femelles gravides). Chez l'hôte mâle, les organes reproducteurs étaient intacts. Ces observations laissent croire à une « castration incomplète » du coléoptère hôte par les parasitoïdes. Les taux de parasitisme chez des spécimens de trois localités étaient particulièrement bas (0 %–3,2 %). Dans une localité, seul un mâle et trois femelles portaient des parasitoïdes et ils contenaient chacun 9–27 larves (moyenne de 19,3). Ces résultats indiquent que les hyménoptères parasitoïdes chez les P. versicolor adultes ont peu d'effet sur la dynamique de population de ce coléoptère. Les larves parasitoïdes comprenaient deux types morphologiques appartenant à au moins deux taxons. Des analyses de l'ADN mitochondrial semblent indiquer que l'un des deux types représente deux espèces de Microctonus Wesmael (Braconidae: Euphorinae). Cette identification générique requiert cependant une confirmation parce que la base de donnée qui a servi à l'identification ne couvre pas tous les genres de braconidés.

[Traduit par la Rédaction]

Type
Systematics & Morphology
Information
The Canadian Entomologist , Volume 143 , Issue 3 , June 2011 , pp. 211 - 223
Copyright
Copyright © Entomological Society of Canada 2011

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