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bioRxiv · 10.1101/2025.10.15.682524

Bone collagen hydrogen isotopes as tracers of local palaeoclimate: The Aurignacian from Isturitz cave (France) as a case study

Ibanez-Herranz, M.·Agudo-Perez, L.·Fernandez-Garcia, M.·Cicero-Cabanas, A.·Soulier, M.-C.·Marin-Arroyo, A. B.
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Abstract

Hydrogen stable isotopes ({delta}2H) preserved in bone collagen have been proposed as a promising proxy for palaeoclimatic reconstruction, though empirical applications remain limited. To evaluate the reliability and scope of this approach, we performed a multiisotopic analysis ({delta}13C, {delta}15N, {delta}34S, and {delta}2H) on 50 herbivore bone samples collected from three archaeostratigraphic layers spanning the Aurignacian sequence of Isturitz Cave (France). This archaeological well-preserved, dated and studied site provides a robust framework for testing isotopic proxies across temporal and taxonomic gradients. Our results reveal a progressive {delta}2H depletion over [~]3000-year interval, consistent with predicted increasing aridity. We also identified species-specific {delta}2H differences, underscoring the need for taxonomic resolution in future applications and in general palaeoclimatic interpretations. While these samples reflect faunal remains accumulated through human activity--introducing potential ecological and sampling biases--they nonetheless provide valuable records of past local conditions. Overall, our findings support the potential of bone collagen {delta}2H as a sensitive indicator of past hydrological conditions and a complementary tool for reconstructing both climatic trends and humanenvironment dynamics.

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Ibanez-Herranz, M., Agudo-Perez, L., Fernandez-Garcia, M., Cicero-Cabanas, A., Soulier, M.-C., Marin-Arroyo, A. B.. 2025-10-15. Bone collagen hydrogen isotopes as tracers of local palaeoclimate: The Aurignacian from Isturitz cave (France) as a case study. https://doi.org/10.1101/2025.10.15.682524

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