geographic variation of strontium and hydrogen isotopes in avian tissue implications for tracking migration and dispersal地理变异禽流感和氢同位素锶的组织跟踪迁移和扩散的影响.pdfVIP

Geographic Variation of Strontium and Hydrogen Isotopes in Avian Tissue: Implications for Tracking Migration and Dispersal 1 2 3 2 1 Megan J. Sellick , T. Kurt Kyser , Michael B. Wunder , Don Chipley , D. Ryan Norris * 1 Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada, 2 Department of Geological Sciences and Geological Engineering, Queen’s University, Kingston, Ontario, Canada, 3 Department of Biology, University of Colorado Denver, Denver, Colorado, United States of America Abstract Background: Isotopes can provide unique solutions to fundamental problems related to the ecology and evolution of migration and dispersal because prior movements of individuals can theoretically be tracked from tissues collected from a single capture. However, there is still remarkably little information available about how and why isotopes vary in wild animal tissues, especially over large spatial scales. Methodology/Principal Findings: Here, we describe variation in both stable-hydrogen (dD ) and strontium (87Sr/86Sr ) F F isotopic compositions in the feathers of a migratory songbird, the Tree Swallow (Tachycineta bicolor), across 18 sampling sites in North America and then examine potential mechanisms driving this variation. We found that dDF was correlated with latitude of the sampling site, whereas 87Sr/86SrF was correlated with longitude. dDF was related to dD of meteoric waters where molting occurred and 87Sr/86SrF was influenced primarily by the geology in the area where feathers were grown. Using simulation models, w