La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Increase in Numbers and Potential Phenological Adjustment of Ruby-throated Hummingbirds (Archilochus colubris) during Autumn Migration at Hawk Mountain Sanctuary, Eastern Pennsylvania, 1990–2014 (2017)
Auteurs :	Jennifer C. Probst, Auteur ; Jean-François Therrien, Auteur ; Laurie J. Goodrich, Auteur ; Keith L. Bildstein, Auteur
Type de document :	Article
Dans :	Wilson Journal of Ornithology (The) (129(2) June, 2017)
Article en page(s) :	360-364
Langues:	Anglais
Résumé :	ABSTRACT Global change can affect several aspects of bird biology, including population size and migration timing. We used count data collected during 25 years (1990?2014) at Hawk Mountain Sanctuary, a raptor migration watch-site in eastern Pennsylvania, to investigate population changes in Ruby-throated Hummingbirds (Archilochus colubris) and the timing of their autumn migration, in light of ongoing climate change. Hummingbird numbers increased significantly from 1990?2014. The first 5%-, 50%-, 95%- and average passage dates of hummingbirds over this time indicated an earlier passage, with the first 5% passage-date shifting earlier significantly. Passage duration (number of days between 5% and 95% of the flight) remained relatively constant from 1990?2014. In light of similar shifts in timing of spring passage of this species, our results suggest that Ruby-throated Hummingbirds may be shifting the timing of their migratory cycle.
En ligne :	https://doi.org/10.1676/16-011.1

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