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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Migration routes, high-use areas, and network connectivity across the annual cycle of an arctic seabird (2023)
Auteurs :	Carrie E. Gray, Auteur ; Brian J. Olsen, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (164(1) January, 2023)
Article en page(s) :	73-84
Langues:	Anglais
Mots-clés:	Annual cycle ; Gavia stellata ; Migration ; Migratory connectivity ; Movement ecology ; Network theory ; Red-throated Loon ; Stopover ecology
Résumé :	Understanding how breeding and non-breeding populations are geographically linked across seasons has important behavioral, demographic, and evolutionary implications for migratory animals. We used movement data collected from satellite-tagged Red-throated Loons (Gavia stellata) to provide new and more accurate information about spatial use during the full annual cycle for this species in eastern North America. We provide the first complete description of four migration routes used by Red-throated Loons along the U.S. mid-Atlantic coast and their northern breeding grounds. Despite sampling just 5% of the North American Atlantic coast non-breeding range, the birds we sampled exhibited a high degree of population spread across 65% of the breeding range, occurring across 44 degrees of longitude and 23 degrees of latitude. Network analysis identified core stopover areas with high population use and slower movement speeds, as well as migratory corridors associated with faster speeds and higher connectivity between core sites. Some of these high-use areas represent sites where environmental events could impact a majority of the sampled individuals, e.g., some of the migratory corridors and stopover locations were used exclusively by birds breeding in the far eastern breeding range. Our results underscore the possibility that spatial connectivity can exist between the migratory period and one stationary period even when there is not strong migratory connectivity as traditionally measured between stationary periods.
En ligne :	https://doi.org/10.1007/s10336-022-02010-2

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