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Ecologie, génétique et symbiose bactérienne chez le grand charançon du pin, Hylobius abietis : adaptation d'un insecte ravageur à son environnement forestier

Abstract : Phytophagous insects are often specialized to a host-plant and develop adaptations for locating, reaching and exploiting this resource. The large pine weevil (Hylobius abietis L.) rely
on an ephemeral and rare resource since its larvae develop on dying conifers. However, forestry methods have modified the deal by providing more egg laying and feeding sites. Many factors of this pest's adaptation to its forest environment have been tested. Molecular markers showed that larval host-plants do not hinder gene flow and do not promote divergence in Hylobius. Strong insect dispersal has been confirmed by the low population structure at a large scale. In the laboratory, olfactive and oviposition preferences are weak, sometimes contradictory with larval performance, and are influenced by insect experience. Characterisation of weevil inhabiting
bacteria revealed proximity with endosymbiotic strains known in other insects. They are probably involved in host-plant exploitation. This mutualistic association has been developed in
the « deep time ». Altogether, the results evicted a host-plant specialization. The larval niche is a crucial point of the insect's biology as well as pest control strategies target as arena of
evolution.
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https://tel.archives-ouvertes.fr/tel-00130374
Contributor : Cyrille Conord <>
Submitted on : Sunday, February 11, 2007 - 9:57:27 PM
Last modification on : Friday, November 6, 2020 - 3:41:38 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 9:09:39 PM

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  • HAL Id : tel-00130374, version 1

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Cyrille Conord. Ecologie, génétique et symbiose bactérienne chez le grand charançon du pin, Hylobius abietis : adaptation d'un insecte ravageur à son environnement forestier. Ecologie, Environnement. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00130374⟩

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