Physiological costs of cold exposure on the parasitoid Aphidius ervi, without selection pressure and under constant or fluctuating temperatures

Ismail, Mohannad;Vernon, Philippe;Hance, Thierry;van Baaren, Joan
(2010) BioControl : journal of the International Organisation for Biological Control — Vol. 55, n° 6, p. 729-740 (2010)

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Authors
  • Ismail, MohannadUMR 6553 CNRS—EcoBio, Université de Rennes 1, Rennes, France
    Author
  • Vernon, PhilippeUMR 6553 CNRS, EcoBio, Université de Rennes 1, Station Biologique de Paimpont, Paimpont, France
    Author
  • Hance, ThierryUCLouvain
    Author
  • van Baaren, JoanUMR 6553 CNRS—EcoBio, Université de Rennes 1, Rennes, France
    Author
Abstract
The aim of this study is to evaluate the physiological costs and the consequences on fitness of cold exposure on the parasitoid Aphidius ervi (Hymenoptera: Aphidiinae) under non-lethal conditions. We exposed 1-day-old mummies to different treatments: control at 20°C, 7°C constant, 7°C fluctuating (7°C for 22 h and 20°C for 2 h). Two performances of fitness were particularly affected after two weeks at 7°C constant: female longevity and the sex ratio of the progeny was male biased. In contrast, egg load at emergence, lifetime fecundity, frequency of asymmetric individuals in both sexes, and mating success were not significantly affected under all treatments. The effects of these treatments on trends such as utilisation of fat reserves and fertility of males and females are discussed. © 2010 International Organization for Biological Control (IOBC).
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Ismail, M., Vernon, P., Hance, T., & van Baaren, J. (2010). Physiological costs of cold exposure on the parasitoid Aphidius ervi, without selection pressure and under constant or fluctuating temperatures. BioControl : journal of the International Organisation for Biological Control, 55(6), 729-740. https://doi.org/10.1007/s10526-010-9303-0 (Original work published 2010)