Angela
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To me it rather looks like a ~50% population change happened in NE europe since Corded Ware, not only because Gedrosia disappeared, but also the 27% Eurogenes15 'Atlantic' dropped to about 12%, and 'Baltic' increased from 13% to >21%. Finally also R1b lineages are very sparse in NE Europe compared to the rest.
One reason is probably the migration of mesolithic scandinavian hunter-gathers who increased I2a and WHG (~'Baltic') in NE europe. I also wonder how densely populated this region was. If sparse, then populations can be altered more easily.
Why Gedrosia disappeared completely though, is not completely explained yet.
That theory makes some sense to me as well, as I've been saying for a long time. I think there was probably migration from the north post Yamnaya, but I also think it needs to be remembered that Corded Ware moved northwest off the more southern regions. It was only later that it moved east and incorporated what I think will turn out to be more EHG like people who were living in the forest steppe, EHG like people who probably had next to no Gedrosia. (I think it has to be kept in mind that the populations in eastern Europe were probably on a cline from north to south. Here we're talking about Yamna, which was to the south and a population-Corded Ware-related to Yamnaya.)While I know that some people will find it disappointing, it may be that Corded Ware really doesn't equal modern northeast European or even eastern European. It just isn't a very good match for those populations.
(The recent paper on these forest steppe populations, which discusses this movement east by Corded Ware is discussed here:
http://www.eupedia.com/forum/thread...ers-in-NW-Russia-R1a1-M17?p=451213#post451213)
Since we've been talking about K12b, here are the K12b figures for Corded Ware, Lithuanians and Russians. In both of the modern populations, North Euro increased by 20 points and Gedrosia dropped by 20 points. Atlantic Med dropped by 7 points in both, and in Lithuanians, Caucasus stayed about the same, but in Russians, it increased.
Corded Ware:
- 50.54% North_European
- 21.94% Gedrosia
- 20.47% Atlantic_Med
- 6.82% Caucasus
- 0.22% South_Asian
- 0.02% Southwest_Asian
- 0.00% East_African
- 0.00% East_Asian
- 0.00% Northwest_African
- 0.00% Siberian
- 0.00% Southeast_Asian
- 0.00% Sub_Saharan
Lithuanians:
77.1 North European
0 Gedrosia
13.7 Atlantic Med
8 Caucasus
1 S.W.Asian
.1 S Asian
Russians:
66.5 North Euro
.2 Gedrosia
13.1 Atlantic Med
14.3 Caucasus
.8 South Asian
.6 SW Asian
0 E.African
1.2 E.Asian
.1 Northwest African
2.7 Siberian
.4S.E.Asian
0 SSA
The Germans actually seem like a better fit with Corded Ware:
48.2 North Euro
7.3 Gedrosia
33 Atlantic Med
9.8 Caucasus
1.7 S.W.Asian
In their case it seems like the rise in Atlantic Med and S.W. Asian cut into the Gedrosia.
I think those more central European populations were formed by different migrations, which may have started off from the steppe at an earlier time, and they also probably experienced more admixture from the prior Neolithic farming communities.