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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Long-distance movements and evidence of post-breeding elevational movements by Cassin’s Vireos (2019)
Auteurs :	Richard W. Hedley, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (90(4) December, 2019)
Article en page(s) :	335-347
Langues:	Anglais
Mots-clés:	Vireo cassinii ; altitudinal migration ; bird migration ; eBird ; geolocators
Résumé :	Bird migration is often framed as a straightforward journey between one breeding site and one wintering site, but recent research has shown that the reality is often more complex. Many species of birds undertake short-distance movements separate from long-distance migration. Such movements appear to be common in species that breed in western North America, where mountainous terrain creates a mosaic of habitats and climatic conditions. However, individual-based tracking studies have disproportionately focused elsewhere, leaving gaps in our understanding of the year-round movements of western species. I used tracking data from light-level geolocators and citizen science data from eBird to study the movements of Cassin’s Vireos (Vireo cassinii) breeding in the Sierra Nevada mountains of California, USA. During three breeding seasons (2013–2015), my observations suggested that Cassin’s Vireos vacate their breeding territories during the post-breeding period in July and August. In April and May 2016, I tagged 22 Cassin’s Vireos with light-level geolocators and, in April and May 2017, recaptured four that had retained their geolocators. Geolocator data showed that these four birds remained in the same geographic region as their breeding territories (likely the same mountain range) during the post-breeding period in July and August 2016, ruling out the possibility of long-distance movements during this time. Analysis of eBird citizen science data suggested that Cassin’s Vireos undertake short-distance molt-migration to higher elevations in the Sierra Nevada Mountains during the post-breeding period. Geolocator data revealed that long-distance fall migration took place in September and spring migration in April or May, and the four birds spent the winter in different parts of the Mexican winter range of Cassin’s Vireos. These results add to the body of literature on the complex movements of migratory songbirds breeding in the mountains of western North America, an understanding that will be important for effective conservation in the future.
En ligne :	https://onlinelibrary.wiley.com/doi/abs/10.1111/jofo.12309

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