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Ecology, Evolution, Behavior and Systematics Age Ratio Mid-continent Greater White-fronted Goose Staging Area Animal Science and Zoology Alaska Anser albifrons frontalis August-September 2010 August-September 2011 Productivity Research Article Ecology delta Yukon-Kuskokwim Alaska Peninsula Aleutian Islands Analytical chemistry Animals/Vertebrates , Birds , Ducks/Geese/Swans , Species life history , Waterfowl , Migratory birds , Breeding sites , Plumage , Seasonal distribution , Seasonal movement , Carbon isotopes , Wildlife , Terrestrial ecosystems , Tundra ecosystems , Coastal ecosystems , Wetland ecosystems , Capturing animals , Animal behavior , Migration organisms , Isotopic analysis , Tundra swan , Stable isotopes , Nitrogen isotopes , Carbon isotopes , Deuterium isotopes Anser albifrons Branta canadensis parvipes Chen canagica Circumpolar distribution Connectivity Distributed computing Distributed computing and systems software Electrical and electronic engineering Electrical engineering Electronics Environmental management Environmental science and management Gene flow