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Linking Hydrogen (delta H-2) Isotopes in Feathers and Precipitation: Sources of Variance and Consequences for Assignment to Isoscapes

Hobson, Keith A.; Van Wilgenburg, Steven L.; Wassenaar, Leonard I. and Larson, Keith LU (2012) In PLoS ONE 7(4).
Abstract
Background: Tracking small migrant organisms worldwide has been hampered by technological and recovery limitations and sampling bias inherent in exogenous markers. Naturally occurring stable isotopes of H (delta H-2) in feathers provide an alternative intrinsic marker of animal origin due to the predictable spatial linkage to underlying hydrologically driven flow of H isotopes into foodwebs. This approach can assess the likelihood that a migrant animal originated from a given location(s) within a continent but requires a robust algorithm linking H isotopes in tissues of interest to an appropriate hydrological isotopic spatio-temporal pattern, such as weighted-annual rainfall. However, a number of factors contribute to or alter expected... (More)
Background: Tracking small migrant organisms worldwide has been hampered by technological and recovery limitations and sampling bias inherent in exogenous markers. Naturally occurring stable isotopes of H (delta H-2) in feathers provide an alternative intrinsic marker of animal origin due to the predictable spatial linkage to underlying hydrologically driven flow of H isotopes into foodwebs. This approach can assess the likelihood that a migrant animal originated from a given location(s) within a continent but requires a robust algorithm linking H isotopes in tissues of interest to an appropriate hydrological isotopic spatio-temporal pattern, such as weighted-annual rainfall. However, a number of factors contribute to or alter expected isotopic patterns in animals. We present results of an extensive investigation into taxonomic and environmental factors influencing feather delta H-2 patterns across North America. Principal Findings: Stable isotope data were measured from 544 feathers from 40 species and 140 known locations. For delta H-2, the most parsimonious model explaining 83% of the isotopic variance was found with amount-weighted growing-season precipitation delta H-2, foraging substrate and migratory strategy. Conclusions/Significance: This extensive H isotopic analysis of known-origin feathers of songbirds in North America and elsewhere reconfirmed the strong coupling between tissue delta H-2 and global hydrologic delta H-2 patterns, and accounting for variance associated with foraging substrate and migratory strategy, can be used in conservation and research for the purpose of assigning birds and other species to their approximate origin. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
PLoS ONE
volume
7
issue
4
publisher
Public Library of Science
external identifiers
  • wos:000305336600086
  • scopus:84859623268
ISSN
1932-6203
DOI
10.1371/journal.pone.0035137
language
English
LU publication?
yes
id
ccebd95f-2ec3-4f57-a184-2c81ebe1f723 (old id 2890896)
date added to LUP
2012-07-25 12:25:12
date last changed
2017-11-19 04:02:19
@article{ccebd95f-2ec3-4f57-a184-2c81ebe1f723,
  abstract     = {Background: Tracking small migrant organisms worldwide has been hampered by technological and recovery limitations and sampling bias inherent in exogenous markers. Naturally occurring stable isotopes of H (delta H-2) in feathers provide an alternative intrinsic marker of animal origin due to the predictable spatial linkage to underlying hydrologically driven flow of H isotopes into foodwebs. This approach can assess the likelihood that a migrant animal originated from a given location(s) within a continent but requires a robust algorithm linking H isotopes in tissues of interest to an appropriate hydrological isotopic spatio-temporal pattern, such as weighted-annual rainfall. However, a number of factors contribute to or alter expected isotopic patterns in animals. We present results of an extensive investigation into taxonomic and environmental factors influencing feather delta H-2 patterns across North America. Principal Findings: Stable isotope data were measured from 544 feathers from 40 species and 140 known locations. For delta H-2, the most parsimonious model explaining 83% of the isotopic variance was found with amount-weighted growing-season precipitation delta H-2, foraging substrate and migratory strategy. Conclusions/Significance: This extensive H isotopic analysis of known-origin feathers of songbirds in North America and elsewhere reconfirmed the strong coupling between tissue delta H-2 and global hydrologic delta H-2 patterns, and accounting for variance associated with foraging substrate and migratory strategy, can be used in conservation and research for the purpose of assigning birds and other species to their approximate origin.},
  author       = {Hobson, Keith A. and Van Wilgenburg, Steven L. and Wassenaar, Leonard I. and Larson, Keith},
  issn         = {1932-6203},
  language     = {eng},
  number       = {4},
  publisher    = {Public Library of Science},
  series       = {PLoS ONE},
  title        = {Linking Hydrogen (delta H-2) Isotopes in Feathers and Precipitation: Sources of Variance and Consequences for Assignment to Isoscapes},
  url          = {http://dx.doi.org/10.1371/journal.pone.0035137},
  volume       = {7},
  year         = {2012},
}