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Expansion d'un ravageur forestier sous l'effet du réchauffement climatique : la processionnaire du pin affecte-t-elle la biodiversité entomologique dans les zones nouvellement colonisées ?

Abstract : Under temperate latitudes, low temperature is usually a key factor constraining the distribution of insects species through minimal thresholds required for survival and development. Thus, range shift is one of the striking effects of global warming observed in a number of cold- sensitive species. However, the consequences of such range shifts on inter-specific interactions are largely unexplored. The winterdeveloping pine processionary moth originated from the Mediterranean Basin but expanded considerably its range distribution towards higher latitudes and altitudes over the last two decades. This range expansion is clearly associated with better winter survival and enhanced feeding activity related to climate warming. Two research topics were developed in our study : (1) the response of natural enemies to an expanding host ; (2) the impact of the colonisation of new areas on an endangered moth species exploiting the same host tree, the Spanish moon moth. Our results show that in newly- colonized areas, pine processionary moth is released from its egg-parasitoids. Thus, near the expansion front, a female pine processionary moth will have more offspring than in the core of its distribution range. Moreover, previous tree defoliation by the pine processionary moth has a negative effect on the development of Spanish moon moth larvae. Our results contribute to understand the causes of the expansion of this forest pest and its consequences on species previously inhabiting the newly- colonized areas.
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Submitted on : Thursday, July 12, 2012 - 4:25:51 PM
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Charles-Edouard Imbert. Expansion d'un ravageur forestier sous l'effet du réchauffement climatique : la processionnaire du pin affecte-t-elle la biodiversité entomologique dans les zones nouvellement colonisées ?. Sciences agricoles. Université d'Orléans, 2012. Français. ⟨NNT : 2012ORLE2010⟩. ⟨tel-00717391⟩

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