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Theses

LA NICHE ÉCOLOGIQUE: CONCEPTS, MODÈLES, APPLICATIONS

Abstract : This thesis is an investigation of the niche concept and of some related major theoretical frameworks: the niche theory and neutral theory in ecology, the niche construction theory in evolutionary biology, and stem cell niche in intra-organism ecology. The first chapter traces the history of the niche concept and compares the niche theory to a competing theory, the neutral theory. The niche concept appears to be an explanans of species diversity and ecosystem structure. The second chapter compares the standard evolutionary theory to the theory of niche construction, in which an organism can affect its environment and thus influence the selection to come. We show how to characterize this confrontation in terms of time scales of processes involved, which allows us to identify the range of validity truly unique to the theory of niche construction more explicitly than it has been in the past. The third chapter develops the research of the previous two chapters in the modeling of a gene therapy as a process of competition and ecological niche construction by cells. We present a family of models applied to different time scales of cellular dynamics, among which the careful modeler can not choose without specific experimental results. We conclude on the conceptions of the relationship between an organism and its environment attached to the various facets of the concept.
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https://tel.archives-ouvertes.fr/tel-00715471
Contributor : Arnaud Pocheville <>
Submitted on : Saturday, July 7, 2012 - 3:26:02 PM
Last modification on : Tuesday, January 19, 2021 - 11:08:17 AM

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  • HAL Id : tel-00715471, version 1

Citation

Arnaud Pocheville. LA NICHE ÉCOLOGIQUE: CONCEPTS, MODÈLES, APPLICATIONS. Evolution [q-bio.PE]. Ecole Normale Supérieure de Paris - ENS Paris, 2010. Français. ⟨tel-00715471⟩

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