The Neolithic transition in Europe was driven by the rapid dispersal of Near Eastern farmers who, over a period of 3,500 years, brought food production to the furthest corners of the continent. However, this wave of expansion was far from homogeneous, and climatic factors may have driven a marked slowdown observed at higher latitudes. Here, we test this hypothesis by assembling a large database of archaeological dates of first arrival of farming to quantify the expansion dynamics. We identify four axes of expansion and observe a slowdown along three axes when crossing the same climatic threshold. This threshold reflects the quality of the growing season, suggesting that Near Eastern crops might have struggled under more challenging climatic conditions. This same threshold also predicts the mixing of farmers and hunter-gatherers as estimated from ancient DNA, suggesting that unreliable yields in these regions might have favoured the contact between the two groups.
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Nature Human Behaviour Open Access 22 December 2022
Holocene vegetation, fire and land use dynamics at Lake Svityaz, an agriculturally marginal site in northwestern Ukraine
Vegetation History and Archaeobotany Open Access 21 June 2021
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The data collected for this study are available from the Open Science Framework repository (https://osf.io/2hcqr/?view_only=c06b3949770549379ff7e5e4eceaf876).
The code used in this study is available from the Open Science Framework repository (https://osf.io/2hcqr/?view_only=c06b3949770549379ff7e5e4eceaf876).
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R.B., A.E., M.L. and A.M. were supported by ERC Consolidator Grant 647797 ‘LocalAdaptation’. R.B. and J.S. were supported by ERC Consolidator Grant 617627 ‘ADaPt’. E.R.J. was supported by a Herchel Smith Research Fellowship. F.T. was supported by ERC Advanced Grant 295733 ‘LanGeLin’ and funds from the 5 × 1000 Year 2013 assigned to the University of Ferrara. V.S. and L.K.B. were supported by the Gates Cambridge Trust. P.M.D. was supported by the HERA Joint Research Programme ‘Uses of the Past’ (CitiGen) and the European Union’s Horizon 2020 research and innovation programme under grant agreement number 649307. P.R.N. was supported by FP7 MC Career Integration Grant number 322261 ‘NEMO-ADAP’. We thank D. Reich, M. Lipson, A. Szecsenyi-Nagy and I. Mathieson for giving us pre-publication access to ancient DNA data. The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.
The authors declare no competing interests.
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Peer review information Primary Handling Editor: Stavroula Kousta.
Extended Data Fig. 1 Process of selecting the connecting segments of the Neolithic expansion routes.
a, Main vertices (blue circles) and routes of expansion (in yellow, red and green) from the core area (grey polygon) at time X before common era (BCE); Neolithic sites present before time X indicated as small black circle and blue circles, blue lines showing the minimum convex polygon around the sites’ distribution. b, At time X - 100 years, a new main vertex of expansion is identified by redrawing a minimum convex polygon over the updated set of Neolithic sites. Two possible connecting segments are identified (dashed lines), including the shortest segment connecting with previous vertices, and an additional segment whose length was less than 150% of the former. c, To identify the most likely expansion route, we counted the number of Neolithic sites that occurred in the following 300 years (up to time X - 400 years; small red circles) within a buffer zone of 50 Km either side of the connecting segments (orange shaded rectangles) and divided it by the segment length. d, The segment with the highest density of filling-in sites in the following 300 years was selected. e, Solid lines show the obtained expansion routes. Where these cross oceans in unrealistic ways, we added a minimal set of additional waypoints to force routes to run along coasts instead (dashed lines). Country borders were plotted using ref. 75.
a, The expansion axes superimposed on a map of mean summer temperature days at 5,500 BCE. b, Mean summer temperature experienced along each expansion axis. Blue, purple, orange and green lines represent the Mediterranean, Central European, Scandinavian, and Northeast European axis, respectively. The slowdown is highlighted by a black line.
a, The expansion axes superimposed on a map of mean winter temperature days at 5,500 BCE. b, Mean winter temperature experienced along each expansion axis. Blue, purple, orange and green lines represent the Mediterranean, Central European, Scandinavian.
a, The expansion axes superimposed on a map of mean annual temperature days at 5,500 BCE. b, Mean annual temperature experienced along each expansion axis. Blue, purple, orange and green lines represent the Mediterranean, Central European, Scandinavian, and Northeast European axis, respectively. The slowdown is highlighted by a black line.
a, The expansion axes superimposed on a map of precipitation of the driest month days at 5,500 BCE. b, Precipitation of the driest month experienced along each expansion axis. Blue, purple, orange and green lines represent the Mediterranean, Central European, Scandinavian, and Northeast European axis, respectively. The slowdown is highlighted by a black line.
a, The expansion axes superimposed on a map of net primary productivity days at 5,500 BCE. b, Net primary productivity experienced along each expansion axis. Blue, purple, orange and green lines represent the Mediterranean, Central European, Scandinavian.
The expansion of farming based on dates of first arrival. Blue, purple, orange and green lines represent the Mediterranean, Central European, Scandinavian and Northeast European axes, respectively. Country borders were plotted using ref. 75.
Details of the archaeological sites with the earliest radiocarbon date reliably associated with early Neolithic cultures with evidence of domestication (including the list of problematic dates that were removed from the dataset).
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Betti, L., Beyer, R.M., Jones, E.R. et al. Climate shaped how Neolithic farmers and European hunter-gatherers interacted after a major slowdown from 6,100 bce to 4,500 bce. Nat Hum Behav 4, 1004–1010 (2020). https://doi.org/10.1038/s41562-020-0897-7
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