#Oxygen Forensics Reanalyses Full Range Of

Oxygen Forensics Reanalyses Full Range Of

The hydrogen and oxygen isotope tracer method has excellent potential where (1) spatial variation of precipitation isotopes exist, and (2) strong, mechanistic relationships link precipitation and isotope ratios in biological tissue. As a result, these isotopes are potentially ideal tracers of geographic origin. The heavy isotope content of precipitated water and snow (ОґD p, Оґ 18O p) varies widely and systematically across the globe, providing a label that is incorporated through diet into animal tissue. Stable isotopes are being increasingly used in wildlife forensics as means of determining the origin and movement of animals. Because the samples used for oxygen isotopic analysis cover all seasons in the sampling period (March 2014 to February 2015) and the full range of 35 S SA variation (235 atoms/nmol SO 4 2) (Figure 2), measuring oxygen isotopic compositions in more weekly samples collected in this sampling period will not change our finding (i.e.

Our analysis focuses on wildlife forensics, but the maps and approaches presented here will be equally applicable to criminal forensic studies involving biological materials. We demonstrate that ОґD f/ОґD p relationships have significant predictive power both in North America and Europe, and show how zones of confidence for the assignment of origin can be described using these predictive relationships. 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. The use of these maps for forensic application is demonstrated using previously published isotope data for bird feathers (ОґD f) in North America and Europe.

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