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Two different life-history strategies determine the competitive outcome between Dirhinus giffardii (Chalcididae) and Pachycrepoideus vindemmiae (Pteromalidae), ectoparasitoids of cyclorrhaphous Diptera

Published online by Cambridge University Press:  09 March 2007

X.G. Wang  and
R.H. Messing
X.G. Wang*
Affiliation:
Department of Plant and Environmental Protection Sciences, University of Hawaii, 7370 Kuamoo Road, Kapaa, HI 96822, USA
R.H. Messing
Affiliation:
Department of Plant and Environmental Protection Sciences, University of Hawaii, 7370 Kuamoo Road, Kapaa, HI 96822, USA
*
*Fax: 1 808 822 2190. E-mail: [email protected]
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Abstract

Dirhinus giffardii Silvestri and Pachycrepoideus vindemmiae Rondani are solitary parasitoids attacking puparia of many cyclorrhaphous flies. They are not typical ectoparasitoids, as they feed on host pupae within puparia that develop from the exoskeleton of host larvae. Dirhinus giffardii did not kill its host until the parasitoid egg developed into a larva, while P. vindemmiae permanently paralysed its host at the time of oviposition. As a result, ovipositing into a young host puparium (< 1 day old) in which the host pupa has not yet fully formed resulted in complete death of offspring in P. vindemmiae, but D. giffardii, although suffering higher mortality than in older host puparia, still showed a level of successful development. In a choice experiment, both parasitoids preferred to attack 2- to 3-day-old puparia in which the host pupae had fully formed, rather than 1-day-old host puparia. Pachycrepoideus vindemmiae always prevailed in competition because it injected venom that not only paralysed the host, but also caused the death of D. giffardii larvae in multi-parasitized hosts. Dirhinus giffardii preferred to attack unparasitized hosts rather than hosts previously parasitized by P. vindemmiae, while P. vindemmiae did not show a preference between unparasitized hosts and hosts previously parasitized by D. giffardii.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 94 , Issue 5 , October 2004 , pp. 473 - 480
Copyright
Copyright © Cambridge University Press 2004

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