Abstract : Foraging individuals may use either personal information derived from their own previous experience or social information based on conspecific observation. Which kind of information is used depends largely on food predictability. When resources are unpredictable, personal information may be of little use, as illustrated by Gyps vultures that mostly rely on social foraging strategies to find carrion. Some human activities increase resource predictability, e.g. supplying feeding stations makes food patches more predictable for scavengers. In this thesis, I explore the impact of different levels of resource predictability on the use of personal or social information in foraging strategies and on the ecological service provided by vultures. I developed an individual-based spatially explicit model of foraging Gyps vultures at a daily scale to explore different behavioural hypotheses as well as different management scenarios. The results show that individuals using previously acquired personal information provided a less efficient scavenging service, tended to be more aggregated on resources and thus suffered more strongly from competition while feeding than individuals foraging in groups. Then, I discuss the consequences of this work in terms of conservation and population management. This work will also be used to help analyse GPS tracking data. Finally, it will be integrated in a study that takes into account socio-economical aspects to better understand all sides of the vultures' ecological service and its sensitivity to human interventions.