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Calibration chain transformation improves the comparability of organic hydrogen and oxygen stable isotope data
Author(s) -
Magozzi Sarah,
Bataille Clement P.,
Hobson Keith A.,
Wunder Michael B.,
Howa John D.,
Contina Andrea,
Vander Zanden Hannah B.,
Bowen Gabriel J.
Publication year - 2021
Publication title -
methods in ecology and evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.425
H-Index - 105
ISSN - 2041-210X
DOI - 10.1111/2041-210x.13556
Subject(s) - comparability , computer science , calibration , transformation (genetics) , data mining , environmental science , statistics , chemistry , mathematics , biochemistry , combinatorics , gene
Stable hydrogen and oxygen isotopic compositions (δ 2 H and δ 18 O, respectively) of animal tissues have been used to infer geographical origin or mobility based on the premise that the isotopic composition of tissue is systematically related to that of local water sources. Isotopic data for known‐origin samples are required to quantify these tissue–environment relationships. Although many of such data have been published and could be reused by researchers, differences in the standards used for calibration and analytical procedures for different datasets limit the comparability of these data. We develop an algorithm that uses results from comparative analysis of secondary standards to transform data among reference scales and estimate the uncertainty inherent in these transformations. We apply the algorithm to a compilation of known‐origin keratin data published over the past ~20 years. We show that transformation improves the comparability of data from different laboratories, and that the transformed data suggest ecophysiologically meaningful differences in keratin–water relationships among different animal groups and taxa. The compiled data and algorithms are freely available in the ASSIGNR r ‐package to support geographical provenance research, and more generally offer a methodology overcoming several challenges in geochemical data integration and reuse.