Comparative analysis of temporal variation in human bones collagen stable isotope across the central-eastern Eurasian Steppe (5000–1000 BP). (IMAGE)

Science China Press

Comparative analysis of temporal variation in human bones collagen stable isotope across the central-eastern Eurasian Steppe (5000–1000 BP).

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(A1–A6): Temporal variations in δ13C values: red trend line represent LOESS regression fits, orange shading highlights the period of synchronous δ13C enrichment (3000–2000 BP) observed across multiple regions; (B1–B6): Temporal variations in δ15N values: green trend lines indicate LOESS regression fits. The green shaded areas denote the inferred range of δ15N values for populations primarily consuming domesticated herbivores (e.g., sheep/goat). This range was derived by first calculating average δ15N values of sheep/goat bones from each region and period, then adding the typical trophic enrichment interval of 3‰–6‰.

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