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Thread: What is EHG/ Eastern European Hunter-Gatherer?

  1. #111
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    Quote Originally Posted by Boreas View Post
    Please clarify:
    Which line of y-dna from Aftovna Gora re-appears in Botai?
    What line of y-dna from Goyet reappears in mesolithic Portugal?

    Bichon-Loshbour may both be post-YD, as do Satsurblia-Kotias and PES-Carelia. As for Villabruna the calibration of the dating is still not definite and thus 'preise'.
    Talking about autosomal ancestry, not exact y-lines. Bichon and Satsurblia both have pretty tight date ranges, Bichon 11850-11579BC, and Satsurblia 11461-11225BC. Very close to the onset of YD, but still securely before it.
    PES is dated during the YD which is even more damning for your great die-off idea.
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     VladimirTaraskin (05-18-2021)

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    Quote Originally Posted by VladimirTaraskin View Post
    And was there a need for them?

    The greatest deviations of the average January temperature from the current values in the Late Dryas epoch are found in the north-western part of Europe. The average January temperatures were 10-13 degrees lower than today. In the direction to the south and east, the deviations gradually decrease, and beyond the Urals, winter temperatures everywhere are close to modern. In Primorye and on the Japanese Islands, the reconstructed temperatures are 2-4 lower than the current ones. In North America, the reconstructed temeratures are also lower than the modern ones, the deviations increase from south to north, towards the inner part of the continent, still occupied by the Laurentian ice sheet II thousand years ago, and reach - 8-9C.

    Judging by the deviations ^ from the current values, the situation in North America and in Europe is fundamentally similar, but the analysis of the actual January temperatures shows that this similarity is incomplete. The reconstructed thermal field for North America is similar to the modern one and differs from it only quantitatively: a decrease in temperature by several degrees and a certain increase in the meridional gradient. The map of actual winter temperatures for Europe is very different from the current one. If on the modern climate map the January isotherms are deployed in the submeridional direction, then here they pass sub-rotately, turning to the north only on the western edge of the continent and as if continuing the isotherms passing through Siberia. Obviously, the deep winter depression of temperatures in the territory of north-western Europe means that the warming effect of the Atlantic Ocean sharply weakened during the Late Dryas epoch. The resulting distribution of winter temperatures indicates the dominance of the continental climate in Europe with its characteristic deep winter cooling.

    The deviations of the average July temperature from the current values were generally not as large as the deviations of winter temperatures. In both Western Europe and North America, they increase from north to south, reaching - 6C. Thus, with a certain general decrease in temperature, the meridional gradient in the summer season was somewhat less than at present. In Eastern Europe and Northern Asia, the average July temperatures in the late Dryas were close to modern.
    This makes perfect sense. Northern North America and northern and northwestern Europe were covered by massive ice sheets. Glaciers/snow act as a reservoir for cold air during summer months and ironically an insulator during winter months. But the overall annual temperature will drop with the presence of substantial amounts of snow as part of a feedback loop. It would make sense that temperatures in Siberia were not much different to today because of the lack of the same snow feedback mechanism due to very arid winters. The biggest difference there compared to the present was the extreme aridity of the landscape due to moisture blocking features, resulting in a biome known as mammoth steppe which was ironically more productive than the taiga which exists today.

    The concept of refugia is more relevant in Europe because of the ice sheets which decimate animal life. Humans in Siberia and Alaska would've been able to hunt down animals although finding water may have been an issue.
    Last edited by Cynic; 05-18-2021 at 06:58 AM.

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