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Thread: Waves of migration into South Asia

  1. #3571
    Registered Users

    Quote Originally Posted by Megalophias View Post
    I feel like I've seen these before, Parasar, but where? They aren't in the paper or supplement of "Genomic analysis of the Andamanese". The Y chromosomes of (some of) the same samples are in "Y-chromosomal sequences of diverse Indian populations and the ancestry of the Andamanese", and are now on the YFull tree, but they are normal (no E1a, A, or C2).

    Edit: wait, were these from Narasimhan et al's awful Y haplogroup caller?
    You have likely seen them.
    The calls were made in the Narasimhan Reich paper. The Lankan ones look fine but some of the others are surprising.

    Edit: Yes the same Yfiler program!

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     Megalophias (01-12-2019)

  3. #3572
    Registered Users

    Ah okay then I give them zero credence till I see the SNP calls myself.

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     parasar (01-12-2019)

  5. #3573
    Registered Users

    Quote Originally Posted by Megalophias View Post
    Ah okay then I give them zero credence till I see the SNP calls myself.
    I take them with a grain of salt myself. The single rare subclade of C1a sample is one thing but all the samples listed just as "E1a" and "C2" set off alarms.

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     palamede (01-13-2019),  parasar (01-13-2019)

  7. #3574
    Registered Users

    This may be of interest for you:

    Differentiating summer and winter rainfall in South Asia around 4.2 ka climatic 'event'

    © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.

    Research article
    15 Jan 2019

    Indian winter and summer monsoon strength over the 4.2 ka BP event in foraminifer isotope records from the Indus River delta in the Arabian Sea

    Alena Giesche1, Michael Staubwasser2, Cameron A. Petrie3, and David A. Hodell1

    1Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, UK
    2Institute for Geology and Mineralogy, University of Cologne, Zülpicher Str. 49a, 50674 Cologne, Germany
    3Department of Archaeology, University of Cambridge, Cambridge, CB2 3DZ, UK

    Received: 15 Aug 2018 – Discussion started: 03 Sep 2018 – Accepted: 07 Dec 2018 – Published: 15 Jan 2019


    The plains of northwest South Asia receive rainfall during both the Indian summer (June–September) and winter (December–March) monsoon. Researchers have long attempted to deconstruct the influence of these precipitation regimes in paleoclimate records, in order to better understand regional climatic drivers and their potential impact on human populations. The mid–late Holocene transition between 5.3 and 3.3 ka is of particular interest in this region because it spans the period of the Indus Civilization from its early development, through its urbanization, and onto eventual transformation into a rural society. An oxygen isotope record of the surface-dwelling planktonic foraminifer Globigerinoides ruber from the northeast Arabian Sea provided evidence for an abrupt decrease in rainfall and reduction in Indus River discharge at 4.2 ka, which the authors linked to the decline in the urban phase of the Indus Civilization (Staubwasser et al., 2003). Given the importance of this study, we used the same core (63KA) to measure the oxygen isotope profiles of two other foraminifer species at decadal resolution over the interval from 5.4 to 3.0 ka and to replicate a larger size fraction of G. ruber than measured previously. By selecting both thermocline-dwelling (Neogloboquadrina dutertrei) and shallow-dwelling (Globigerinoides sacculifer) species, we provide enhanced detail of the climatic changes that occurred over this crucial time interval. We found evidence for a period of increased surface water mixing, which we suggest was related to a strengthened winter monsoon with a peak intensity over 200 years from 4.5 to 4.3 ka. The time of greatest change occurred at 4.1 ka when both the summer and winter monsoon weakened, resulting in a reduction in rainfall in the Indus region. The earliest phase of the urban Mature Harappan period coincided with the period of inferred stronger winter monsoon between 4.5 and 4.3 ka, whereas the end of the urbanized phase occurred some time after the decrease in both the summer and winter monsoon strength by 4.1 ka. Our findings provide evidence that the initial growth of large Indus urban centers coincided with increased winter rainfall, whereas the contraction of urbanism and change in subsistence strategies followed a reduction in rainfall of both seasons.

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