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Theses

Dynamique spatiale du charançon du bananier en interaction avec le système de culture et l'organisation paysagère

Abstract : The PhD work aims at detecting and understanding factors and mechanisms explaining the spatial heterogeneity of banana black weevils' (Cosmopolites sordidus) populations in order to control them. Two approaches are commonly considered to understand the spatial heterogeneity of populations: statistics applied to spatial data and mechanistic modelling. My PhD work considers the interest of combining those approaches to understand the movement processes of insect adults and the interaction between life traits and spatial dynamics of a population. Understanding movement processes requires collecting spatial data at the individual level. By combining a statistical approach by maximum likelihood estimation and a mechanistic individual-based model, I showed a high dependence of movement versus habitat matrix. I showed also that perception of space is less important for a weevil located on a banana plant or on crop residues than for a weevil located on bare soil or ditch. An individual-based model (COSMOS) was developed to simulate the spatial dispersion and infestation of C. sordidus in interaction with different elements of the cropping system. The model was successfully tested at the plot scale, by comparing infestation statistics between observed and simulated values. The emerging properties of the model were tested by simulating different spatial arrangements of banana plants. For instance, the model showed that the time to colonize a plot is longer when the plot is planted regularly than when it is planted in patches. The model revealed the importance of the interface between banana area and fallow for locating weevils' trap.
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https://pastel.archives-ouvertes.fr/pastel-00564816
Contributor : Fabrice Vinatier <>
Submitted on : Thursday, February 10, 2011 - 10:16:31 AM
Last modification on : Monday, October 19, 2020 - 4:26:05 PM
Long-term archiving on: : Wednesday, May 11, 2011 - 2:47:05 AM

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  • HAL Id : pastel-00564816, version 1

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Fabrice Vinatier. Dynamique spatiale du charançon du bananier en interaction avec le système de culture et l'organisation paysagère. Ecologie, Environnement. AgroParisTech, 2010. Français. ⟨NNT : 2010AGPT0068⟩. ⟨pastel-00564816⟩

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