title: Migratory Connectivity at High Latitudes: Sabine's Gulls (Xema sabini) from a Colony in the Canadian High Arctic Migrate to Different Oceans.
abstract: The world's Arctic latitudes are some of the most recently colonized by birds, and an understanding of the migratory connectivity of circumpolar species offers insights into the mechanisms of range expansion and speciation. Migratory divides exist for many birds, however for many taxa it is unclear where such boundaries lie, and to what extent these affect the connectivity of species breeding across their ranges. Sabine's gulls (Xema sabini) have a patchy, circumpolar breeding distribution and overwinter in two ecologically similar areas in different ocean basins: the Humboldt Current off the coast of Peru in the Pacific, and the Benguela Current off the coasts of South Africa and Namibia in the Atlantic. We used geolocators to track Sabine's gulls breeding at a colony in the Canadian High Arctic to determine their migratory pathways and wintering sites. Our study provides evidence that birds from this breeding site disperse to both the Pacific and Atlantic oceans during the non-breeding season, which suggests that a migratory divide for this species exists in the Nearctic. Remarkably, members of one mated pair wintered in opposite oceans. Our results ultimately suggest that colonization of favorable breeding habitat may be one of the strongest drivers of range expansion in the High Arctic.
authors.affiliation: High Arctic Gull Research Group, Victoria, British Columbia, Canada.|Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada.
authors.forename: Shanti E
authors.initials: SE
authors.lastname: Davis
authors.affiliation: High Arctic Gull Research Group, Victoria, British Columbia, Canada.
authors.forename: Mark
authors.initials: M
authors.lastname: Maftei
authors.affiliation: High Arctic Gull Research Group, Victoria, British Columbia, Canada.|Department of Biology, Acadia University, Wolfville, Nova Scotia, Canada.
authors.forename: Mark L
authors.initials: ML
authors.lastname: Mallory
mesh_terms: D025041:Animal Migration; D000818:Animals; D001110:Arctic Regions; D001267:Atlantic Ocean; D002170:Canada; D046091:Charadriiformes / Q000502:physiology*; D017753:Ecosystem; D005260:Female; D040362:Geographic Information Systems; D005843:Geography; D008297:Male; D009276:Namibia; D010140:Pacific Ocean; D010568:Peru; D012621:Seasons; D013019:South Africa