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Rôle des compromis évolutifs dans la spécialisation et la coexistence d'espèces compétitrices. Développements théoriques et expérimentaux chez les insectes parasitoïdes.

Abstract : Trade-offs have a central place in the evolution of life-history traits since they bound the universe of possibilities. Trade-offs in energy allocation toward reproduction and maintenance are essentially linked, in parasitoid insects, to the host and food availability of the environment and to the number of eggs carried by females. Our experiments in behavioural ecology and eco-physiology show, in the parasitoid Venturia canescens, that (i) environmental characteristics select for a differential energy allocation toward egg manufacture and energy storage during the larval stage; and (ii) that an adjustment of the energy allocation strategies in response to the host availability takes place during the adult stage. Our theoretical investigations put forward that food quality has a central role in the evolution of the trade-off between host and food searching, and suggest its importance in the structuring of parasitoid communities.
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https://tel.archives-ouvertes.fr/tel-00369569
Contributor : Perrine Pelosse <>
Submitted on : Friday, March 20, 2009 - 12:56:15 PM
Last modification on : Monday, February 10, 2020 - 4:36:47 PM
Long-term archiving on: : Thursday, June 10, 2010 - 5:41:40 PM

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  • HAL Id : tel-00369569, version 1

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Perrine Pelosse. Rôle des compromis évolutifs dans la spécialisation et la coexistence d'espèces compétitrices. Développements théoriques et expérimentaux chez les insectes parasitoïdes.. Ecologie, Environnement. Université Claude Bernard - Lyon I, 2008. Français. ⟨tel-00369569⟩

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