I2a2 in Scotland is not Germanic, but Neolithic British!

Tomenable

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There seems to be a north-south cline with more Neolithic British ancestry in Scotland than in England:

A2UMbst.png


rDLoC2u.png


^^^
I mapped those 34 samples (blue = has Britain Neolithic admix, red = doesn't have, big dot = I2a2):

egmOAjc.png


^^^ That pretty much explains why Scotland has so much I2a2 today:

Zf2LaQu.gif
 
Northern English and Scottish I2a2 from the Copper-Bronze Ages:

Stockton-on-Tees, County Durham, (sample I1767), 2200–1970 BC, I2a2a1a1a
Pabay Mor, Isle of Lewis, Western Isles (sample I2655), 1442–1273 BC, I2a2a1a1a1
 
I2a1 is also more frequent in Scotland and Ireland compared to England:

RXH12Of.png


But both of Copper-Bronze Age I2 samples are actually I2a2, not I2a1.
 
Most of I2a2 carriers in Ireland have Germanic surnames (according to data from FTDNA Projects). These are probably descendants of Lowland Scots who settled in Ulster. However, in Scotland itself this haplogrup seems to be of Neolithic British origin, rather than Germanic.

I guess that it has to be associated with Caledonians rather than Gaels.
 
Most of I2a2 in Northern Ireland probably came there recently with Lowland Scots. On the other hand, in Scotland it seems to be ancient, dating back to Neolithic Farmers. It is quite common in all of Scotland, including formerly Pictish areas, at over 5%. More common than in most of England. But let's notice that its frequency peaks between these two walls (maybe it is due to recent genetic drift or founder effects, but maybe not?):

800px-Hadrians_Wall_map.svg.png


Perhaps this pattern of I2a2 being more common in Southern Scotland (over 10%) than in the rest of Scotland (over 5%) is recent. But we cannot exclude the possibility, that it is ancient and dates back all the way to times when those two Roman walls were constructed. Perhaps a large number of men with I2a2 were "trapped" between the Hadrian's Wall and the Antonine Wall?
 
I had some doubts about the unique "germanic" origin of Y-I2a2 and also Y-R1b-U152; by 'germanic' I don't think "from Germany" (because Celts and pre-Celts were already in Germany before the Anglo-Saxon colonization. And I2a2 in North seems often a refuges Y-haplo, borderside to the Germanic core.
In fact, I think the first Mesolithic Y-lineages were rather Y-I2a1a+I2a1b in the Isles; the Neolithic families surely send a lot of Y-G2a like in other regions of whole Europe; it's true it's based on a rather spotty localization of ancient DNA and the Atlantic sea front lacks a lot. To me, at the light of anDNA studied to date I think Y-I2a2 is linked to Megaliths people or to ONE subgroup of them; I remember the megalithic ones (labelled unprecisely 'Long Barrows') which took part in the formation of next Trichterbecher alias Funnelbeaker people which seem male lineages of Mesolithic origin which took the strong side upon original Neolithic pops and extended from Britain to Scandinavia and Western Poland and which seem one of the basis of Polish Globular Amphora pop. The Megalithic phenomenon seem arrived from West rather than from the opposite side so we can believe the Y-I2a2 came from Britain to Poland; but I2a2 was already densely enough present in Central Balkans since the 8000/6000 BC, and among APLc pop of Hungary, so it's difficult to tell if the I2a2 of GAC came from West or from East, only a deep subclades analysis can tell us (if possible according to dates and anDNA today state). To date with what we have it seems I2a2 was denser in Eastern Europe at high dates, before becoming commonest in West, later, but this could be an illusion by lack of western DNA.
That said in Scotland and England, I2a1 and I2a2 have been found in the same region and cover the same dates. FunnelBK could be born by the convergence of two streams? W + E ? I2a2 from East? Megalithism is a relatively new phenomenon among Neolithics pops of Europe; physically it coincids with new supposed 'mediters' taller and more robust, with more archaic traits, as a mean: from East or continental North-East too? the Western Europe so called 'megalithic types' ware taller than the Eastern Mediterranea ones, spite Western Europe, before megalithism, was known for its dwarfy pops (Mugem, Teviec, about 1m55) and first Neolithics from East-Med were between 1m60 and 1m65, mean about 1m62. So some moves on Atlantic and North Sea shores. Aside someone can guess the stature increase is linked to the benefit of crossings and not to a new specific pop but it implies some pops moves too.

&: 'Neolithic' at the 3500/3000 BC is no more the early pure Neolithic, and the pops living in Britain were surely in contact with Chalcolithic pops of diverse places;
&&: The distribution of Y-I2a2 in Ireland points towards a South Scottish occupation, at first sight, as Tomenable says. But don't forget Cruithni were settled in Northern Ireland too, gaelic form for Pretani (Brittons), and were surely Picts in fact; the Britain distribution could date for a part from the Belgae and Gaulish pops from Switzerland which leaved artefacts in Eastern Celtic Britain, along with some R-U152. I 'm wondering if the SE Scotland and Fifeshire could not have some Celtic pops from Belgium and Switzerland too, elements which entered in the Picts genesis... I had guessed I2a2 could have come with first Round Barrows, BBs from North-Rhineland (so close to Herz in Germany) but to date I lost my bet because BBs seem Y-R1b for the most of them. Maybe some more BB's Y-haplos could nuance this statement? ATW we can almost sure Celts incorporated the preceding Megalithic pops on Atlantic and in the Isles, a good element to learn maritime skills. This makes we can assume a lot of the Y-I2a2 were already in Britain since Megaliths, but someones could have come with later moves, pre-/proto-Celtic and Celtic ones, the least with the Celts I suppose (in proportion).
Wait and see more anDNA fromNorth and Atlantic.
 
Let's take a closer look at subclades of I2a2 in various ancient DNA samples:

Copper Age Spain:

I0581, El Mirador, I2a2a1

Neolithic Britain:

I2691, Distillery Cave, I2a2a1
I0520, Banbury Lane, I2a2a1
I3134, Raschoille Cave, I2a2a1a1a
I2660, Distillery Cave, I2a2a1a1a
I2933, South Ronaldsay, I2a2a1a1a2

Beaker & Bronze Age Britain:

I1767, Co. Durham, I2a2a1a1a
I2655, Isle of Lewis, I2a2a1a1a1

Globular Amphora culture:

I2441, Kierzkowo, I2a2a1b
ILK001, Ilyatka, I2a2a1b
ILK002, Ilyatka, I2a2a1b2

Yamnaya/Catacomb cultures:

Bul4, Mednikarovo, I2a2a1b1b
RISE552, Ulan IV, I2a2a1b1b

Vatya culture in Hungary:

RISE479, Erd 4, I2a2a1a2a

=============

^^^
Copper-Bronze Age British I2a is most similar to Neolithic British and Copper Age Iberian I2a.
 
It is true that not all I2a2 is Germanic in origin. I have explained that at length in my revised history of haplogroup I2 about two years ago. I have updated the phylogenetic tree last year to clearly show which branch is Neolithic/Megalithic and which is Germanic (or other).

I2a2-tree.png



While L669 and P78 are found in Germanic countries, they spread during the Mesolithic, Neolithic and Bronze Age (including from Yamna and Corded Ware) are so aren't specifically Germanic (although some deep clades may be). Only I2a2-L801 can really be said at present to be undeniably Germanic. It is also the largest branch, deserving a full tree of its own.

I2-L801-tree.png



Britain and Ireland have both Germanic I2a2-L801 and Neolithic I2a2-M284 and I2a2-L1229. Unfortunately I haven't got detailed data about the proportion of each by region. A quick look at the I2a2-M223 Project map tells me that the Germanic variety (labelled as 'Cont' by FTDNA) is more common in England and Lowland Scotland, while the Neolithic branches ('Isles' and 'Roots') are far more common in Highland Scotland and especially Ireland.
 

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