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Joumon people of the Ikawazu kaizuka site
Topic Started: Apr 1 2018, 10:58:20 PM (29 Views)
black man
The Right Hand
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The sample from the Ikawazu kaizuka site is in hg N9b1. That sure is an interesting finding. But keep in mind the sample is just about 2720 years old and from western Toukai. I.e., it's more western and younger than the Kantou Joumon samples described by Shinoda and Kansai 1999. So with the mtDNA hg profile of the latter having been portrayed as apparently more continental than older Joumon samples and Touhoku Joumon samples by Kanzawa-Kiriyama et al. 2013, it might not surprise that the Ikawazu kaizuka sample examined by McColl et al. 2018 seems to be genetically very close to mainstream Japanese samples in their fig. 2.

Interestingly, the analysis of the frequencies of non-metric dental traits revealed Toukai Joumon people were the Joumon people phenotypically most similar to "Yayoi immigrants", Kofun period people and "modern Japanese" according to table 7 of a 2006 paper by Matsumura Hirofumi. Even Joumon people from sites of the https://en.wikipedia.org/wiki/San%27yō_region Sanyou region (to the west of Toukai region) seemed to be phenotypically more distant from later inhabitants of the Japanese archipelago.

Sources:
Kanzawa-Kiriyama et al. 2013: "Ancient mitochondrial DNA sequences of Jomon teeth samples from Sanganji, Tohoku district, Japan"; doi: 10.1537/ase.121113
Matsumura 2006: "Non-metric dental trait variation among local sites and regional groups of the Neolithic Jomon period, Japan"; 10.1537/ase.051202
McColl et al. 2018: "The prehistoric peopling of Southeast Asia"; doi: 10.1126/science.aat3628
Shinoda and Kansai 1999: "Intracemetery genetic analysis at the Nakazuma Jomon site in Japan by mitochondrial DNA sequencing"
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