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Characterising the flight height activity on the bearded vulture

AuthorsGarcía-Jiménez, Ruth; Péron, Guillaume; Pérez-García, Juan M.; Martínez, José M.; Duriez, Olivier; Margalida, Antoni
Issue Date2019
CitationXXIV Congreso Español y VII Ibérico de Ornitología (2019)
AbstractDespite it being a key aspect of the ecology of movement for endangered bearded vulture Gypaetus barbatus, very little is known about its use of the vertical dimension and to its flight behaviour, due to the lack of precision of the available vertical position data, especially in mountainous environment. We used a space-state model to assess the flight height patterns of 53 bearded vultures inhabiting four different populations of France and Spain, concretely in Pyrenees, Corsica, French Alps and Central Massif. Thanks to this model, we were able to correct the heavy-tailed observation error of the vertical plane measures, and evaluate the influence of individual factors such as age, sex, and territorial status, but also external factors such as the region, relief characteristics, and potential for orographic and thermal uplift. One of the interesting aspects of our methodology is that we can accommodate different sampling regime and different positioning error rates from different GPS manufacturer or user specifications. Indeed, our findings could be applied to determine the behaviour that this species presents when facing man-made structures, defining the species particular collision risk rate, but also the specific associated corrective action. In the same way, this methodology could be employed to evaluate any bird species flight height behaviour, giving the opportunity to confront the collision risk at a more specific population local scale, or even at a species global level, thus improving on existing maps of collision risk, and further, preventing also any possible bird collision in the air traffic.
DescriptionResumen del trabajo presentado al XXIV Congreso Español y VII Ibérico de Ornitología, celebrado en Cadiz del 13 al 17 de noviembre de 2019.
Appears in Collections:(IREC) Comunicaciones congresos
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