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Movement of early humans into the Indian subcontinent

Date:
May 11, 2017
Source:
Tata Institute of Fundamental Research
Summary:
Scientists in India have used a diffusion model to study the movement and merger of early humans into and in the Indian subcontinent starting from their initial location as determined by archaeologists. They then identify locations where different groups are expected to merge, and compare this data with genetic studies of tribes from that region to show that predictions agree with genetic data.
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This image shows movement of people into the hinterland of the Indian subcontinent starting from Kabul, Hyderabad and North Orissa. The topmost image in the figure shows the starting points of simulation. The middle image shows spread of humans over 4000 years from the start and the third panel shows the evolution after about 6400 years
Credit: Vahia, Yadav, Ladiwala, Mathur

Prehistoric human migration was mainly driven by human wanderlust and population pressures but relied critically on the habitability of available land. We have modelled such prehistoric population dynamics using a diffusion equation whose numerical solution is tempered by accurate geological data for the Indian subcontinent taken from satellite databases.

We define the driving forces by assuming that people will move out of any given region if the neighbouring regions are habitable. In turn, we define habitability by quantifying parameters like the availability and proximity of water, and flatness and altitude of the land. We define relative habitability which takes into account the presence of the initial population. We then consult the archaeological evidence of early humans in the subcontinent and identify three possible locations in Kabul which would represent the Ancestral North Indian entry into India, Hyderabad which would represent the earliest Ancestral South Indian population into India and we take two possible entry points for Ancestral Austro Asiatic as Goa and Orissa identified as two major break points in the mountain range that mark the Indian Subcontinent for people coming to India along the coast.

We find that people entering from Goa would soon become indistinguishable from the original Ancestral South Indian population. We therefore focus on entry from Orissa. On simulating the movement of these people we find that the groups merge in well localised geographical regions within the subcontinent. We then analyse the genetic data of the tribal population of the region. Since these groups are largely endogamous, they maintain their original genetic signal with very weak dilution due to intermixing. This allows us to identify the roots of different groups and compare it with our simulation. The genetic data agrees well with our predictions. We then expand our simulation to show that over a long period of time, the pattern of population that appears, agrees well with the present population of India.


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Materials provided by Tata Institute of Fundamental Research. Note: Content may be edited for style and length.


Journal Reference:

  1. Mayank N. Vahia, Nisha Yadav, Uma Ladiwala, Deepak Mathur. A diffusion based study of population dynamics: Prehistoric migrations into South Asia. PLOS ONE, 2017; 12 (5): e0176985 DOI: 10.1371/journal.pone.0176985

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Tata Institute of Fundamental Research. "Movement of early humans into the Indian subcontinent." ScienceDaily. ScienceDaily, 11 May 2017. <www.sciencedaily.com/releases/2017/05/170511141935.htm>.
Tata Institute of Fundamental Research. (2017, May 11). Movement of early humans into the Indian subcontinent. ScienceDaily. Retrieved May 27, 2017 from www.sciencedaily.com/releases/2017/05/170511141935.htm
Tata Institute of Fundamental Research. "Movement of early humans into the Indian subcontinent." ScienceDaily. www.sciencedaily.com/releases/2017/05/170511141935.htm (accessed May 27, 2017).

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