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From: "Didier Vernade" <>
Subject: Re: [DNA] The Story of I1b1 (P37.2+)
Date: Thu, 7 Feb 2008 05:57:11 +0100
References: <c19.2e0fb65e.34da8a78@aol.com><003d01c86879$4744ec90$6400a8c0@Ken1><7A3832E7-A99E-474D-8E28-5EA39CAEBFF2@vizachero.com><003801c868e0$b3c0f730$6400a8c0@Ken1><C3879F7E-CE65-4751-BF02-AF51B50D559D@vizachero.com>


Ken,

I am insisting on this question of the I haplogroup refugium because from
the number of generations separating the 4 major clades it can be seen that,
in rough figures, the sardinian type is separated from the 3 other clades
by 800 generations. This clade could be the remnant of an italian refugium
(also south of France) and it seems to me that this generation time fits
with the general frame of the LGM. Similarly, I was wondering whether the
dispersal to the British isles could be related to any faint traces in Spain
and southern France. I would agree that there is no absolute necessity for
distinct refugiums but divergence is often related to some kind of
separation. To compare with R1b, the ht15 / ht35 division has been proposed
to reflect a difference in refugium. Again, although very hypothetical, it
would be interesting that this division in 4 main branches that you
demonstrated could correlate with 4 different refugiums (I just don't know
what to do with the "western" type). I think that one of the main lessons of
the DNA testing in Europe was the formidable impact of the glaciation on the
structure of the present day population. So, no traces of "ancient" I in
Spain ?

Didier

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