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Impact des changements d'usage sur la viabilité d'une population menacée dans un espace multi-protégé : le Crave à bec rouge (Pyrrhocorax pyrrhocorax) sur l'île d'Ouessant

Abstract : This study aimed at assessing the viability of a threatened population of Chough (Pyrrhocoax pyrrhocorax) in a protected area facing drastic changes of landuse: abandonment of agricultural lands and development of tourism. In the first part, the study identifies the main factors influencing demographic parameters. Population appears to be limited by nest site availability. Fledging success is influenced by prey biomass availability and by area of available foraging habitat close to the nest. Summer survival of juveniles is strongly negatively correlated to the number of tourists visiting the island, thus suggesting a potential negative impact of tourism on chough population dynamics.
In the second part, demographic viability of the Chough population was assessed by comparing different likely scenarii of evolution and impacts of human activities. Individual-Based model simulations showed that the population is expected to be stable under the current level of tourist activity and land encroachment, but could extinguish if the current increase in the number of tourist visits is maintained. Multi-Agent System modelling showed that land management could be optimized if spatial issues and species demands were considered.
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https://tel.archives-ouvertes.fr/tel-00177416
Contributor : Christian Kerbiriou <>
Submitted on : Monday, October 8, 2007 - 10:26:38 AM
Last modification on : Monday, December 14, 2020 - 9:52:49 AM
Long-term archiving on: : Sunday, April 11, 2010 - 10:23:53 PM

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Christian Kerbiriou. Impact des changements d'usage sur la viabilité d'une population menacée dans un espace multi-protégé : le Crave à bec rouge (Pyrrhocorax pyrrhocorax) sur l'île d'Ouessant. Ecologie, Environnement. Museum national d'histoire naturelle - MNHN PARIS, 2006. Français. ⟨tel-00177416⟩

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