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A δ2H Isoscape of blackberry as an example application for determining the geographic origins of plant materials in New Zealand

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  • Kiri McComb
  • Shaerii Sarker
  • Jurian Hoogewerff
  • Alan Hayman
  • Russell Frew

Abstract

In this investigation, two previously reported precipitation δ2H isoscapes for New Zealand were used to develop a δ2H isoscape for blackberry (Rubus sp.) leaf. These isoscapes were calibrated using the measured δ2H values of 120 authentic blackberry leaf samples collected from across the country. A regression model based on environmental variables available for New Zealand was also determined to predict δ2H values measured from blackberry leaves without initially modelling the precipitation δ2H values. The three models were compared for their accuracy and precision when assigning 10 samples of blackberry leaves for their geographic location based on their measured δ2H values. One of the models based on a precipitation isoscape was similar in accuracy and precision of assignment to the model determined from the environmental variables and provides an approach for determining valid isoscapes for future plant materials.

Suggested Citation

  • Kiri McComb & Shaerii Sarker & Jurian Hoogewerff & Alan Hayman & Russell Frew, 2019. "A δ2H Isoscape of blackberry as an example application for determining the geographic origins of plant materials in New Zealand," PLOS ONE, Public Library of Science, vol. 14(12), pages 1-23, December.
    • Handle: RePEc:plo:pone00:0226152
    DOI: 10.1371/journal.pone.0226152
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    References listed on IDEAS

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    1. Yuri Gori & Ana Stradiotti & Federica Camin, 2018. "Timber isoscapes. A case study in a mountain area in the Italian Alps," PLOS ONE, Public Library of Science, vol. 13(2), pages 1-22, February.
    2. Keith A Hobson & Michael B Wunder & Steven L Van Wilgenburg & Robert G Clark & Leonard I Wassenaar, 2009. "A Method for Investigating Population Declines of Migratory Birds Using Stable Isotopes: Origins of Harvested Lesser Scaup in North America," PLOS ONE, Public Library of Science, vol. 4(11), pages 1-10, November.
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