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OVIPOSITION BEHAVIOUR OF APHIDIINE WASPS (HYMENOPTERA: BRACONIDAE, APHIDIINAE): MORPHOLOGICAL ADAPTATIONS AND EVOLUTIONARY TRENDS

Published online by Cambridge University Press:  31 May 2012

Wolfgang Völkl  and
Manfred Mackauer
Wolfgang Völkl
Affiliation:
Lehrstuhl für Tierökologie I, Universität Bayreuth, D-95440 Bayreuth, Germany
Manfred Mackauer*
Affiliation:
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
*
1 Author to whom all correspondence should be addressed (E-mail: [email protected]).
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Abstract

We examined oviposition behaviour in 49 species representing 19 genera of Aphidiinae. All species are solitary parasitoids of aphids (Hemiptera: Aphidoidea). Six general types are described that differ in oviposition time, behaviour, and morphology. The Ephedrini have the least specialized oviposition behaviour within the subfamily, with Praini and Aphidiini displaying various adaptations for host capture and oviposition. Use of the forelegs to grasp and orient aphids for oviposition has arisen twice, in Praini and, independently, in the genus Monoctonus Haliday (Aphidiini: Monoctonina). Morphological modifications of the terminal abdominal segments for host capture are found in Trioxina and in several species of Pauesia Quilis (Aphidiina). A “quick” sting is characteristic of species in the genus Aphidius Nees and related genera. The greatest degree of behavioural diversification occurred among Pauesia species, including cryptic behaviour, ant mimicry, and “sneak” oviposition. Acquired chemical camouflage and mimicry of the host’s cuticular hydrocarbon pattern to avoid detection by guarding ants is found in Aclitus obscuripennis Foerster, the genus Paralipsis Foerster, and the two closely related genera Adialytus Foerster and Lysiphlebus Foerster. It is suggested that the main driving forces in the evolution of parasitoid oviposition behaviour were aphid defensive behaviour and avoidance of aggression by trophobiotic ants. The results are compared with phylogenetic relationships inferred from morphological and molecular data.

Résumé

Nous avons étudié le comportement de ponte chez 49 espèces appartenant à 19 genres d’Aphidiinae. Toutes ces espèces sont des parasitoïdes solitaires de pucerons (Hemiptera : Aphidoidea) et elles peuvent être regroupées en six types généraux différents par la chronologie de leur ponte, leur comportement et leur morphologie. Les Ephidrini ont le comportement le moins spécialisé de toute la sous-famille, alors que les Praini et les Aphidiini présentent des adaptations diverses pour la capture de l’hôte et pour la ponte. L’utilisation des pattes antérieures pour saisir et orienter les pucerons pour la ponte est apparue deux fois, chez les Praini et, de façon indépendante, chez le genre Monoctonus Haliday (Aphidiini : Monoctonina). Des modifications morphologiques des segments abdominaux terminaux se retrouvent chez les Trioxina et chez plusieurs espèces de Pauesia Quilis (Aphidiina). Une piqûre rapide est caractéristique des espèces du genre Aphidius Nees et des genres apparentés. La plus grande diversification comportementale a été observée chez les espèces de Pauesia, notamment le camouflage, le mimétisme et la ponte furtive. L’acquisition d’un camouflage chimique et le mimétisme des patterns cuticulaires d’hydrates de carbone des pucerons empêchent Aclitus obscuripennis Foerster de même que les espèces du genre Paralipsis Foerster et de deux autres genres apparentés, Adialytus Foerster et Lysiphlebus Foerster, d’être repérées trop facilement par les fourmis gardiennes. Nous croyons que l’évolution du comportement de ponte de ces parasitoïdes est le résultat de deux forces directrices, le comportement de défense des pucerons et la capacité des parasitoïdes d’éviter les attaques des fourmis trophobiontes. Les résultats présentés ici sont comparés aux relations phylogénétiques obtenues à partir de données morphologiques ou moléculaires.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 132 , Issue 2 , April 2000 , pp. 197 - 212
Copyright
Copyright © Entomological Society of Canada 2000

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