The causes of Neanderthal–modern human (MH) turnover are ambiguous. While potential biocultural interactions between the two groups are still little known, it is clear that Neanderthals in southern Europe disappeared about 42 thousand years ago (ka) after cohabitation for ~3,000 years with MH. Among a plethora of hypotheses on Neanderthal extinction, rapid climate changes during the Middle to Upper Palaeolithic transition (MUPT) are regarded as a primary factor. Here we show evidence for stable climatic and environmental conditions during the MUPT in a region (Apulia) where Neanderthals and MH coexisted. We base our findings on a rare glacial stalagmite deposited between ~106 and ~27 ka, providing the first continuous western Mediterranean speleothem palaeoclimate archive for this period. The uninterrupted growth of the stalagmite attests to the constant availability of rainfall and vegetated soils, while its δ13C–δ18O palaeoclimate proxies demonstrate that Apulia was not affected by dramatic climate oscillations during the MUPT. Our results imply that, because climate did not play a key role in the disappearance of Neanderthals in this area, Neanderthal–MH turnover must be approached from a perspective that takes into account climatic and environmental conditions favourable for both species.
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We thank all local speleologists that helped with the 2014 and 2019 fieldwork at Pozzo Cucù, Sant’Angelo, Zaccaria and Messapi caves: G. Loperfido, S. Inguscio, G. Ragone, P. Lippolis, A. Lacirignola, D. Leserri, M. Marraffa, O. Lacarbonara, F. Semeraro, S. Calella, P. Calella, C. Pastore, C. Marchitelli, R. Romanazzi, R. Cupertino, G. Caló and F. Lorusso (Gruppo Speleologico Martinese, CARS Altamura, Gruppo Speleologico Neretino, Gruppo Ricerche Carsiche Putignano, Gruppo Puglia Grotte and Gruppo Escursionistico Speleologico Ostunense), as well as the Bellanova family for access to Messapi Cave. A.C., J.D.W. and V.C. are also grateful to all members of Gruppo Speleologico Martinese for their logistic help and warm hospitality in Martina Franca. Thanks also to M. Parise (University of Bari) for help during 2014 fieldwork; A. Reina (Polytechnic University of Bari) for his enthusiasm in supporting this research; V. Casulli and R. Laragione of Castellana Grotte for their interest in supporting this study; M. Wimmer and M. Luetscher (Innsbruck University) for their help during laboratory work; L. Pisani (Bologna University) for the DEM figure used in Extended Data Fig. 1; and L. Calabrò (Bologna University) for drilling of sample SA1. A.C. is supported by Leonardo Da Vinci Grant 2019 (DD MIUR, no. 787, 15/04/2019); S.B. is supported by ERC grant no. 724046—SUCCESS (https://ERC-SUCCESS.eu), and H.C. by NSFC grant no. 41888101. This research received financial contributions from both Grotte di Castellana and Federazione Speleologica Pugliese.
The authors declare no competing interests
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a) Apulia region with colour-coded topography; black dots indicate major caves in Puglia (from http://www.catasto.fspuglia.it/), while red circles report caves explored for this project. b) PC stalagmite found close to its original growth position. c) PC milling subsampling for δ18O and δ13C.
Intra-stadial and interstadial events recorded by PC δ18O compared to Greenland ice core δ18O (24). The events are reported, in both curves, with grey shading.
Comparison between PC δ13C, growth rate, δ18O and [234/238U]i.
Speleothems (except PC, Fig. 1 main text) examined in this study. Blue rectangles indicate the location of sampling for U-Th dating.
Top: comparison between StalAge and COPRA 2σ range and the resulting average age model used in this work. Bottom: Propagation of positive and negative 2σ uncertainty in the various age models. U-Th ages are shown by yellow dots and black 2σ error bars.
Subsamples were extracted from individual growth lamina. δ13C-δ18O correlation (r) provided for each tested layer. The absence of a strong correlation between δ13C and δ18O and of a systematic increase from the centre to the flank indicate that calcite was deposited under quasi-equilibrium conditions (see Hendy test discussion for details).
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Columbu, A., Chiarini, V., Spötl, C. et al. Speleothem record attests to stable environmental conditions during Neanderthal–modern human turnover in southern Italy. Nat Ecol Evol 4, 1188–1195 (2020). https://doi.org/10.1038/s41559-020-1243-1