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Ref ID: 36840
Ref Type: Journal Article
Authors: Silva, Fabio
Weisskopf, Alison
Castillo, Cristina
Murphy, Charlene
Kingwell-Banham, Eleanor
Qin, Ling
Fuller, Dorian Q.
Title: A tale of two rice varieties: modeling the prehistoric dispersals of  japonica  and proto-japonica rices
Date: 2018
Source: Holocene
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.
Volume: 28
Number: 11
Page Start: 1745
Page End: 1758