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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Rare case of an adult male Montagu’s Harrier Circus pygargus over-summering in West Africa, as revealed by GPS tracking (2017)
Auteurs :	Iben H. Sørensen, Auteur ; Almut E. Schlaich, Auteur ; Raymond H. G. Klaassen, Auteur ; Henning Heldbjerg, Auteur ; Ben J. Koks, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (158(3) 2017/07/01)
Article en page(s) :	753-760
Langues:	Anglais
Résumé :	Over-summering within or near the African wintering range by immature, non-breeding individuals occurs regularly in several species of long-distance migratory raptors, yet the extent of over-summering in Africa by adult birds remains unclear. In this study, we describe a case of an adult Montagu’s Harrier over-summering in Africa, as revealed by GPS tracking. By relating detailed knowledge of the bird’s movements to remotely sensed environmental data (normalized difference vegetation index, NDVI), we show that over-summering in this case was likely related to an exceptionally difficult breeding season the previous year rather than an effect of adverse weather conditions encountered during the winter or a failed attempt to migrate. Various factors are discussed as potential driving forces behind the bird’s intra-African movements. Finally, we relate the documented case to a large number of North European Montagu’s Harriers studied by telemetry and show that over-summering in Africa by adult individuals is indeed a rare event.
En ligne :	https://link.springer.com/article/10.1007/s10336-017-1445-8

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