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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Post-fledging migration and wintering strategies of individual juvenile Lesser Black-backed Gulls (Larus fuscus) (2021)
Auteurs :	Rahel M. Borrmann, Auteur ; Richard A. Phillips, Auteur ; Thomas A. Clay, Auteur ; Stefan Garthe, Auteur
Type de document :	Article
Dans :	Ibis (163(3) July, 2021)
Article en page(s) :	1017-1031
Langues:	Anglais
Mots-clés:	Bhattacharyya's affinity index ; navigation ; ontogeny of behaviour ; orientation ; tracking
Résumé :	Research into the patterns and drivers of juvenile migration is important for understanding the development of individual migration strategies. Although several recent studies have tracked adult large gulls throughout the annual cycle, the movements of juveniles remain poorly understood. We fitted Global Positioning System (GPS) devices that transmit locations through the Global System for Mobile Communications (GSM) to ten juvenile Lesser Black-backed Gulls Larus fuscus prior to fledging on the island of Spiekeroog, Germany, to study their first autumn migration and wintering behaviour. The tracked birds initially departed on similar compass bearings south to south-west, after which migration routes diverged. Individuals took 38–107 days to reach their wintering sites in Algeria, Morocco or Spain. Birds visited 6.7 ± 3.7 (mean ± sd) stopover sites en route and spent substantial time in northern Europe, with some individuals converging at the same sites over small spatial scales (
En ligne :	https://onlinelibrary.wiley.com/doi/abs/10.1111/ibi.12917

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