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- W1969663695 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 ( 13 C/ 12 C) and nitrogen ( 15 N/ 14 N) 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 (>2 years). Breeding males ( n = 302) collected during 7 consecutive years exhibited significant age-specific and altitudinal effects in δ 13 C values and age-specific and temporal effects in δ 15 N values. The δ 13 C values of older males increased with altitude at the rate of ≈1.3‰ 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 (δ 13 C = −26.07 to −20.86‰) observed along a single altitudinal transect (755 m) nearly brackets the range of δ 13 C values recorded in feathers across the North American breeding range of the warbler from Georgia to New Brunswick (11° of latitude) and from New Brunswick to Michigan (22° of longitude). These data indicate that age-specific and altitudinal effects must be considered when using δ 13 C values to delineate the geographic origin of avian species with large altitudinal and latitudinal ranges." @default.
- W1969663695 created "2016-06-24" @default.
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- W1969663695 date "2002-05-28" @default.
- W1969663695 modified "2023-09-23" @default.
- W1969663695 title "Stable isotope signature of philopatry and dispersal in a migratory songbird" @default.
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- W1969663695 doi "https://doi.org/10.1073/pnas.082240899" @default.
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