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A tale of two rice varieties: Modelling the prehistoric dispersals of japonica and proto-indica rices

Silva, F; Weisskopf, A; Castillo, C; Murphy, C; Kingwell-Banham, E; Qin, L; Fuller, DQ; (2018) A tale of two rice varieties: Modelling the prehistoric dispersals of japonica and proto-indica rices. The Holocene , 28 (11) pp. 1745-1758. 10.1177/0959683618788634. Green open access

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Abstract

We model the prehistoric dispersals of two rice varieties, japonica and proto-indica, across Asia using empirical evidence drawn from an archaeobotanical dataset of 400 sites from mainland East, Southeast and South Asia. The approach is based on regression modelling wherein goodness of fit is obtained from log–log quantile regressions of the archaeologically inferred age versus a least-cost distance from the origin(s) of dispersal. The Fast Marching method is used to estimate the least-cost distances based on simple geographical features. We explicitly test three hypotheses for the arrival of japonica rice to India where, it has been proposed, it hybridized with the indigenous proto-indica, subsequently spreading again throughout India. Model selection, based on information criteria, highlights the role of the Inner Asia Mountain Corridor in introducing japonica rice into northeast India, followed closely by a ‘mixed-route’ model, where japonica was also almost simultaneously introduced via Assam, Bangladesh and Myanmar. Finally, we estimate the impact of future archaeological work on model selection, further strengthening the importance of the Inner Asia Mountain Corridor.

Type: Article
Title: A tale of two rice varieties: Modelling the prehistoric dispersals of japonica and proto-indica rices
Open access status: An open access version is available from UCL Discovery
DOI: 10.1177/0959683618788634
Publisher version: https://doi.org/10.1177/0959683618788634
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Archaeobotany, early agriculture, hybridization, India, model selection, South Asia
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of SandHS > Institute of Archaeology
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of SandHS > Institute of Archaeology > Institute of Archaeology Gordon Square
URI: http://discovery.ucl.ac.uk/id/eprint/10059719
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