Skip to Main content Skip to Navigation
Theses

Réponse démographique des populations longévives aux changements climatiques : importance de la variabilité spatio-temporelle et de l'hétérogénéité individuelle.

Abstract : The main goal of this PhD was to study the impact of environmental variability on the demography of long-lived species. We focused on the influence of spatio-temporal variability as well as on the importance of individual quality in the response of populations to environmental changes. This study was based on the demographic analysis of two long-lived and migrant species: one population of white stork (Ciconia ciconia) and two black-browed albatross populations (Thalassarche melanophris), using climatic indices as indicators of the environmental variability faced by individuals. The parallel analysis of these populations revealed some general patterns linking the demographic response to climate to the life history strategy. Indeed, we obtained negative relationships between the impact of climate on a trait and its contribution to the population growth rate, illustrated in these long-lived species by a pronounced canalization of adult survival. However, whether this relation might presuppose a unique response of all individuals to any given climatic parameters, a detailed analysis highlighted a more complex situation supporting contrasted responses. Seasonal conditions, related to the spatio-temporal variability of the environmental conditions faced by these migrant populations, had distinct impacts on populations' demography. In addition, individuals in a population are not clones. By considering some individual heterogeneity (age, breeding experience), we demonstrated the necessity to consider inter-individual differences in the demographic response of populations to environmental variability, in order to better understand their dynamics. Finally, under the actual context of global changes, climatic forecasts might not support short-term decline of the studied populations. However, the relevance of such a prediction is presently limited by the difficulty to model the response of populations to a new range of climatic conditions.
Document type :
Theses
Domain :
Complete list of metadatas

Cited literature [268 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00245570
Contributor : Delphine Bonnet <>
Submitted on : Thursday, February 7, 2008 - 1:53:30 PM
Last modification on : Monday, October 19, 2020 - 10:59:52 AM
Long-term archiving on: : Monday, May 10, 2010 - 12:23:08 PM

Identifiers

  • HAL Id : tel-00245570, version 1

Collections

Citation

Marie Nevoux. Réponse démographique des populations longévives aux changements climatiques : importance de la variabilité spatio-temporelle et de l'hétérogénéité individuelle.. domain_other. Université de La Rochelle, 2008. Français. ⟨tel-00245570⟩

Share

Metrics

Record views

316

Files downloads

3387