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Continuous-surface geographic assignment of migratory animals using strontium isotopes: A case study with monarch butterflies
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Description: We provide a complete framework to apply ⁸⁷Sr/⁸⁶Sr ratios for tracking migratory animals. We found that combining δ²H values and ⁸⁷Sr/⁸⁶Sr ratios into a dual assignment always provided the most constrained area of natal origin and recommend the use of dual ⁸⁷Sr/⁸⁶Sr-δ²H geographic assignment for future studies.