Linking hydrogen (δ2H) isotopes in feathers and precipitation: sources of variance and consequences for assignment to isoscapes

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 (δ(2)H) in feathers provide an alternative intrinsic marker of animal origin due to the predictable spatial...

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Published in:PloS one 2012, Vol.7 (4), p.e35137-e35137
Main Authors: Hobson, Keith A, Van Wilgenburg, Steven L, Wassenaar, Leonard I, Larson, Keith
Format: Article
Language:English
Subjects:
Algorithms
Analysis
Animal behavior
Animal Migration
Animals
Annual rainfall
Biologi
Biological Sciences
Biology
Bird migration
Birds
Climate
Conservation
Earth Sciences
Endangered & extinct species
Environmental factors
Feathers
Feathers - chemistry
Forage
Forages
Geography
Geospatial data
Hydrogen
Hydrogen - analysis
hydrogen isotopes
Hydrology
Isotopes
Isotopes - analysis
mexico
migratory connectivity
molt
moult
Natural Sciences
Naturvetenskap
North America
Precipitation
Probability
Rain
Rainfall
Seasons
Songbirds
Stable isotopes
Substrates
Tissues
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creator Hobson, Keith A
Van Wilgenburg, Steven L
Wassenaar, Leonard I
Larson, Keith
description 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 (δ(2)H) 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 δ(2)H patterns across North America. Stable isotope data were measured from 544 feathers from 40 species and 140 known locations. For δ(2)H, the most parsimonious model explaining 83% of the isotopic variance was found with amount-weighted growing-season precipitation δ(2)H, foraging substrate and migratory strategy. This extensive H isotopic analysis of known-origin feathers of songbirds in North America and elsewhere reconfirmed the strong coupling between tissue δ(2)H and global hydrologic δ(2)H 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.
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For δ(2)H, the most parsimonious model explaining 83% of the isotopic variance was found with amount-weighted growing-season precipitation δ(2)H, foraging substrate and migratory strategy. This extensive H isotopic analysis of known-origin feathers of songbirds in North America and elsewhere reconfirmed the strong coupling between tissue δ(2)H and global hydrologic δ(2)H 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.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>22509393</pmid><doi>10.1371/journal.pone.0035137</doi><oa>free_for_read</oa></addata></record>
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subjects Algorithms
Analysis
Animal behavior
Animal Migration
Animals
Annual rainfall
Biologi
Biological Sciences
Biology
Bird migration
Birds
Climate
Conservation
Earth Sciences
Endangered & extinct species
Environmental factors
Feathers
Feathers - chemistry
Forage
Forages
Geography
Geospatial data
Hydrogen
Hydrogen - analysis
hydrogen isotopes
Hydrology
Isotopes
Isotopes - analysis
mexico
migratory connectivity
molt
moult
Natural Sciences
Naturvetenskap
North America
Precipitation
Probability
Rain
Rainfall
Seasons
Songbirds
Stable isotopes
Substrates
Tissues
title Linking hydrogen (δ2H) isotopes in feathers and precipitation: sources of variance and consequences for assignment to isoscapes
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