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Stable isotope signature of philopatry and dispersal in a migratory songbird

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dc.contributor.author Graves, Gary R. en
dc.contributor.author Romanek, C. S. en
dc.contributor.author Navarro, A. R. en
dc.date.accessioned 2010-02-24T19:47:40Z
dc.date.available 2010-02-24T19:47:40Z
dc.date.issued 2002
dc.identifier.citation Graves, Gary R., Romanek, C. S., and Navarro, A. R. 2002. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F8695">Stable isotope signature of philopatry and dispersal in a migratory songbird</a>." <em>Proceedings of the National Academy of Sciences of the United States of America</em>. 99 (12):8096&ndash;8100. <a href="https://doi.org/10.1073/pnas.082240899">https://doi.org/10.1073/pnas.082240899</a> en
dc.identifier.issn 0027-8424
dc.identifier.uri http://hdl.handle.net/10088/8695
dc.description.abstract Stable isotope analysis is widely promoted as a practical method for tracing the geographic origins of migratory birds. However, the extent to which geospatial patterns of isotope ratios in avian tissues are influenced by age-specific, altitudinal, and temporal factors remains largely unexplored. We measured carbon (C-13/C-12) and nitrogen (N-15/N-14) isotope ratios in feathers of black-throated blue warblers (Dendroica caerulescens) breeding along a relatively steep altitudinal gradient in the Appalachian Mountains to evaluate the effects of altitude and year on the isotopic signatures of yearling (first breeding season) and older males (&gt;2 years). Breeding males (n = 302) collected during 7 consecutive years exhibited significant age-specific and altitudinal effects in delta(13)C values and age-specific and temporal effects in delta(15)N values. The delta(13)C values of older males increased with altitude at the rate of approximate to1.3%(o) per 1,000 m, suggesting a high degree of year-to-year philopatry to narrow altitudinal zones, if not to breeding territories. In contrast, absence of altitudinal patterns in yearlings most likely reflects natal dispersal. Carbon isotope variation (delta(13)C = -26.07 to -20.86%.) observed along a single altitudinal transect (755 m) nearly brackets the range of delta(13)C values recorded in feathers across the North American breeding range of the warbler from Georgia to New Brunswick (110 of latitude) and from New Brunswick to Michigan (22degrees of longitude). These data indicate that age-specific and altitudinal effects must be considered when using delta(13)C values to delineate the geographic origin of avian species with large altitudinal and latitudinal ranges. en
dc.relation.ispartof Proceedings of the National Academy of Sciences of the United States of America en
dc.title Stable isotope signature of philopatry and dispersal in a migratory songbird en
dc.type Journal Article en
dc.identifier.srbnumber 74996
dc.identifier.doi 10.1073/pnas.082240899
rft.jtitle Proceedings of the National Academy of Sciences of the United States of America
rft.volume 99
rft.issue 12
rft.spage 8096
rft.epage 8100
dc.description.SIUnit NMNH en
dc.description.SIUnit NH-Vertebrate Zoology en
dc.citation.spage 8096
dc.citation.epage 8100


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