Brazilian researchers create isotopic map that can dismiss 92% of Amazon in timber investigations
Scientists sampled 800 trees across 63 Amazon sites and built an isotopic fingerprinting model that can eliminate 92% of the rainforest when tracking suspicious wood.
Researchers collected wood samples from 800 trees at 63 locations throughout the Amazon and used stable oxygen isotope ratios to generate an isoscape that can exclude 92% of the forest in illegal timber cases. Led by Luiz Antonio Martinelli at the Center for Nuclear Energy in Agriculture, University of São Paulo, the method offers Brazil's Federal Police a tamper-proof chemical fingerprint that cannot be forged by loggers.
While the current model narrows investigations to roughly 240,000 square kilometres, its precision drops in heavily deforested zones. To improve the system, PhD candidate Isabela Maria Souza Silva is incorporating carbon and nitrogen isotopes, with future plans for strontium analysis and elemental mapping. The scientists argue that combining isotopic data with other techniques—DNA, satellite monitoring, and paperwork verification—will strengthen prosecutions of illegal logging both in Brazil and internationally.
Why it matters
A reliable chemical test can help stop illegal logging that fuels Amazon deforestation and illegal trade.
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