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Les effets des changements climatiques et des changements d'usages sur les oiseaux d'eau migrateurs : une approche mécaniste chez un oiseau emblématique, la Cigogne blanche

Abstract : Understanding adaptations that allow species to live in temporally and spatially variable environments is crucial to predict how species may respond to current and future global changes. Long-term studies have shown that climatic variations affect the dynamic of populations. However, the relative influence of habitat selection and density-dependence processes is still poorly understood and explained. The aim of this thesis is, firstly by a correlative approach, to investigate the density-dependent habitat selection at varying spatial scales in an increasing white stork (Ciconia ciconia) population. Secondly, by a mechanistic approach, we studied the relative effects of climate, habitat and breeder experience in terms of reproductive fitness (fledging success, body condition and sex ratio) in this population monitored for 30 years in a sensitive wetland in Charente-Maritime, western France. This work helped identifying the mechanisms that lead to nesting habitat selection. This work supports research showing that habitat degradation by human activities may affect habitat selection decisions. In addition, these results provide crucial information to understand the adaptations of this population in a changing environment, which allows predicting more efficiently the response of the population to future environmental changes.
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https://tel.archives-ouvertes.fr/tel-00748802
Contributor : Martine Lacalle Connect in order to contact the contributor
Submitted on : Tuesday, November 6, 2012 - 9:32:47 AM
Last modification on : Thursday, January 11, 2018 - 6:14:38 AM
Long-term archiving on: : Thursday, February 7, 2013 - 3:43:56 AM

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  • HAL Id : tel-00748802, version 1

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Hélène Gadenne. Les effets des changements climatiques et des changements d'usages sur les oiseaux d'eau migrateurs : une approche mécaniste chez un oiseau emblématique, la Cigogne blanche. Sciences de l'environnement. Université de Poitiers, 2012. Français. ⟨NNT : ⟩. ⟨tel-00748802⟩

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