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Theses

La clonalité : un processus majeur de la dynamique spatiale et du fonctionnement des communautés végétales en systèmes prairiaux

Abstract : Dispersion through clonal growth may be a major process of plant community structuring especially in grassland systems where most species are clonal. These species produce genetically identical ramets organized in a network structure, whose aggregation depends on the species clonal growth strategy. The present thesis aims at analyzing and understanding grassland plant community dynamics based on spatial assembly rules of clonal species and determining its consequences for community functioning. To achieve these goals, we used complementary experimental and modeling approaches. We demonstrated that clonal growth strategies determine community spatial structure at fine scale, generating a wide range of patterns. This variability was suggested to result from a modification of clonal traits in response to the biotic environment. Indeed, we demonstrated that clones are able to adjust horizontal growth based on competitor's identity. The adaptive nature of this plastic response in resistance to competition depended on plant structural blue-print and, to a lesser extent, on ontogeny. We also demonstrated that clonal traits had a major role in community functioning by influencing productivity, probably through the spatial patterns they drive. These results were applied to the establishment of herbaceous buffer strips and helped to define an optimal sowing to maximize water preservation. The present thesis underlines the importance of spatial processes operating at the clone scale for those operating at the community or the ecosystem scale.
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Theses
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https://tel.archives-ouvertes.fr/tel-00725017
Contributor : Valerie Briand <>
Submitted on : Thursday, August 23, 2012 - 3:54:58 PM
Last modification on : Monday, April 29, 2019 - 2:30:46 PM
Long-term archiving on: : Friday, December 16, 2016 - 8:16:14 AM

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  • HAL Id : tel-00725017, version 1

Citation

Anne-Kristel Bittebière. La clonalité : un processus majeur de la dynamique spatiale et du fonctionnement des communautés végétales en systèmes prairiaux. Sciences de l'environnement. Université Rennes 1, 2012. Français. ⟨tel-00725017⟩

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