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How does heat shock affect the life history traits of adults and progeny of the aphid parasitoid Aphidius avenae (Hymenoptera: Aphidiidae)?

Published online by Cambridge University Press:  27 January 2010

O. Roux ,
C. Le Lann ,
J. J. M. van Alphen  and
J. van Baaren
O. Roux*
Affiliation:
Laboratoire d'Écologie Fonctionnelle, UMR 5245 CNRS-UPS-INPT, Université Paul Sabatier, 31062Toulouse cedex 04, France Écologie des Forêts de Guyane (UMR-CNRS 8172), Campus agronomique, BP709, 97379Kourou cedex, France
C. Le Lann
Affiliation:
UMR 6553 ECOBIO, Université de Rennes I, Campus de Beaulieu, Avenue du Général Leclerc, 35 042Rennes cedex, France
J. J. M. van Alphen
Affiliation:
UMR 6553 ECOBIO, Université de Rennes I, Campus de Beaulieu, Avenue du Général Leclerc, 35 042Rennes cedex, France Institute of Biology Leiden, Van der Klaauw Laboratory, Kaiserstraat 63, 2311 GP LeidenPO Box 9516, 2300RALeiden, The Netherlands
J. van Baaren
Affiliation:
UMR 6553 ECOBIO, Université de Rennes I, Campus de Beaulieu, Avenue du Général Leclerc, 35 042Rennes cedex, France
*
*Author for correspondence Fax: (33) 594 594 35 65 22 E-mail: [email protected]
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Abstract

Because insects are ectotherms, their physiology, behaviour and fitness are influenced by the ambient temperature. Any changes in environmental temperatures may impact the fitness and life history traits of insects and, thus, affect population dynamics. Here, we experimentally tested the impact of heat shock on the fitness and life history traits of adults of the aphid parasitoid Aphidius avenae and on the later repercussions for their progeny. Our results show that short exposure (1 h) to an elevated temperature (36°C), which is frequently experienced by parasitoids during the summer, resulted in high mortality rates in a parasitoid population and strongly affected the fitness of survivors by drastically reducing reproductive output and triggering a sex-dependent effect on lifespan. Heat stress resulted in greater longevity in surviving females and in shorter longevity in surviving males in comparison with untreated individuals. Viability and the developmental rates of progeny were also affected in a sex-dependent manner. These results underline the ecological importance of the thermal stress response of parasitoid species, not only for survival, but also for maintaining reproductive activities.

Keywords

developmental ratefecundityheat stresslongevitysex-specific effectparasitic wasp
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 5 , October 2010 , pp. 543 - 549
Copyright
Copyright © Cambridge University Press 2010

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