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Global application of stable hydrogen and oxygen isotopes to wildlife forensics
The precipitation maps show that the greatest potential for applying hydrogen and oxygen isotope forensics exists in mid- to high-latitude continental regions, where strong spatial isotope gradients exist and where strong, mechanistic relationships link precipitation and isotope ratios in biological tissue exist.
Evaluation of the origin and fate of nitrate in the Abbotsford Aquifer using the isotopes of15N and18O in NO3
- L. Wassenaar
- Environmental Science
- 1 July 1995
High-precision laser spectroscopy D/H and 18O/16O measurements of microliter natural water samples.
A detailed assessment of the performance of a liquid-water isotope analyzer is presented, including instrument precision, estimates of sample memory and sample mass effects, and instrumental drift, and a recommended analysis procedure to achieve optimum results using OA-ICOS.
Comparative equilibration and online technique for determination of non-exchangeable hydrogen of keratins for use in animal migration studies
- L. Wassenaar, K. Hobson
- Environmental ScienceIsotopes in environmental and health studies
- 1 September 2003
A rapid, low cost, analytical approach to facilitate online continuous-flow isotope-ratio mass spectrometry (CF-IRMS) δD analyses of keratins through the use of calibrated keratin working standards and "comparative equilibration" to correct for the effects of moisture on exchangeable hydrogen.
Linking breeding and wintering grounds of neotropical migrant songbirds using stable hydrogen isotopic analysis of feathers
Hydrogen isotopes may become a powerful tool for linking breeding and wintering grounds of neotropical migrant songbirds, as well as other migratory species moving between isotopically distinct regions.
AQUIFER VULNERABILITY INDEX: A GIS - COMPATIBLE METHOD FOR GROUNDWATER VULNERABILITY MAPPING
The Aquifer Vulnerability Index (AVI) method for mapping the vulnerability of groundwater is based on two key parameters, 1) thickness of each sedimentary unit above the uppermost aquifer, and 2)…
Effects of lipid extraction on stable carbon and nitrogen isotope analyses of fish tissues: potential consequences for food web studies
– We examined whether solvent-based lipid extractions, commonly used for stable isotope analysis (SIA) of biota, alters δ15N or δ13C values of fish muscle tissue or whole juvenile fish. Lipid…
Linking Hydrogen (δ 2H) Isotopes in Feathers and Precipitation: Sources of Variance and Consequences for Assignment to Isoscapes
This extensive H isotopic analysis of known-origin feathers of songbirds in North America and elsewhere reconfirmed the strong coupling between tissue δ 2H and global hydrologic δ2H patterns, and accounting for variance associated with foraging substrate and migratory strategy, can be used in conservation and research.
Global isoscapes for δ 18 O and δ 2 H in precipitation: improved prediction using regionalized climatic regression models
Abstract. A regionalized cluster-based water isotope prediction (RCWIP) approach, based on the Global Network of Isotopes in Precipitation (GNIP), was demonstrated for the purposes of predicting…
Improved Method for Determining the Stable-Hydrogen Isotopic Composition (δD) of Complex Organic Materials of Environmental Interest
Despite new and increasing applications in environmental studies, determinations of the stable-hydrogen isotope (δD) composition of complex organic substrates are hampered by laborious preparation…