Biologie et écologie d'une population isolée : exemple d'Eryngium viviparum et perspectives pour sa conservation en France

Le résumé fourni par la source

The geographical isolation is an important threat for the long term preservation of populations. It is crucial to understand how the viability of populations is affected in such context, in particular to define conservation priorities. Eryngium viviparum J.Gay (Apiaceae) is one of the most endangered plant in Europe, with a fragmented distribution between the NW of the Iberian peninsula and Brittany. ln France, the species is maintained only on a single locality, after the destruction of its habitat by human activities during 1980s. Despite a conservation program and an attentive management within a protected area, the strong isolation experimented by this population bring up questions about its long-term viability. In this context, through a multidisciplinary approach, this thesis aims to improve the biological and ecological knowledge of E. viviparum, and more particularly within its last French population. This thesis is organized according three main axes : (1) The study of large-scale E. viviparum ecological amplitude, and the characterization of its fine scale ecological preferences within the last french population. (2) The viability evaluation of the isolated population according to its demographic modalities, and to its genetic structure in comparison with Iberian populations. (3) The experiment of its reintroduction modalities in France.The results of this study will contribute to define the long-term conservation priorities of E. viviparum in France. Finally, the case of E. viviparum is a good model to study the effect of the isolation on an isolated population dynamic, and to apply adapted conservation for species in a similar context.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.