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The failure to discriminate: superparasitism of Trichoplusia ni Hübner by a generalist tachinid parasitoid

Published online by Cambridge University Press:  09 July 2009

V. Caron ,
J.H. Myers  and
D.R. Gillespie
V. Caron*
Affiliation:
University of British Columbia, Department of Zoology, 6270 University Boulevard, Vancouver, V6T 1Z4
J.H. Myers
Affiliation:
University of British Columbia, Department of Zoology, 6270 University Boulevard, Vancouver, V6T 1Z4
D.R. Gillespie
Affiliation:
Pacific Agri-food Research Centre, Agriculture and Agri-food Canada, Agassiz, BC, V0M 1A0
*
*Author for correspondence Fax: +61 3 9905 5613 E-mail: [email protected]
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Abstract

Parasitoids are dependent on their hosts, which provide all of the resources for larval development. Parasitoid fitness, therefore, is directly related to the host quality, as determined by host size, age and health (e.g. parasitisation status); and this can only be assessed by the female parasitoid during host selection. Most studies of parasitoid-host interactions have focused on hymenopteran parasitoids rather than dipterans that are believed to be less discriminating during host selection. We assessed the impact of host quality and superparasitism on parasitoid fitness in Compsilura concinnata Meigen, a gregarious tachinid dipteran parasitoid, and its lepidopteran host the cabbage looper, Trichoplusia ni Hübner.

Female C. concinnata parasitised all host stages of T. ni that were presented to them, but emergence rates were higher from older hosts. Females readily superparasitised hosts. The number of flies emerging was higher from hosts parasitised at later instars, and flies emerged earlier from heavily superparasitised hosts. Superparasitism decreased parasitoid pupal weight and development time, indicating intra-host competition between parasitoid larvae and skewed the parasitoid sex ratio in favour of males.

Host discrimination does not seem to be well developed in C. concinnata. Hosts are superparasitised despite the effects of superparasitism on offspring and sex ratio. This could be due to the wide host range of C. concinnata; avoiding high superparasitism could occur naturally due to host switching and, therefore, developing host discrimination mechanisms for one host species may not be crucial.

Keywords

host-parasitoid interactionshost qualityhost selectionhost stagesex ratioCompsilura concinnata
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 3 , June 2010 , pp. 255 - 261
Copyright
Copyright © Cambridge University Press 2009

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