tag:blogger.com,1999:blog-3563811638411839784.post6035300755297892015..comments2023-05-15T07:11:30.874+02:00Comments on Leherensuge: New paper on Mediterranean geneticsMajuhttp://www.blogger.com/profile/12369840391933337204noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-3563811638411839784.post-57517916785783852862010-05-19T10:21:03.053+02:002010-05-19T10:21:03.053+02:00"As far as I know, there haven't been &qu..."As far as I know, there haven't been "autochtonous" people left in proper Toulousain (ie the right bank of the Garonne river) for 50 years".<br /><br />This claim sounds exaggerated and very hard to believe, Heraus. I live in an area very strongly affected by 20th century immigration and industrial immigrants almost never settle in "tiny villages" but almost invariably in the urban area. And even there the local population tends to remain somewhat strong because they are also economically dynamized by the same processes that attracted the immigrants. <br /><br />I don't know the area as well you do but still I find it hard to believe.<br /><br />Also among the researchers there is one from CRNS and University of Toulouse III Paul Sabatier. <br /><br />"Sampling the high valley of the Ariège river would be more interesting".<br /><br />Ideally sampling wider areas should be much more interesting and also producing other data for contrast than just PC graphs, which are very susceptible to sampling distortions and can only tell that much in the best case. <br /><br />Populations best defined by a third component (not visible in the PC graph) will tend to behave abnormally. For example in Bauchet 07, Basques cluster very well with each other at bayesian K-means analysis but, in PC graphs, they appear totally scattered because they have very low apportions of the two main components and small individual variations in these totally change the individual position in the PC plot. <br /><br />PC graphs can only tell so much and K-means analysis is a much needed complement.Majuhttps://www.blogger.com/profile/12369840391933337204noreply@blogger.comtag:blogger.com,1999:blog-3563811638411839784.post-52013619298867901882010-05-18T14:46:41.261+02:002010-05-18T14:46:41.261+02:00I wonder how they choose individuals that should g...I wonder how they choose individuals that should get sampled. As far as I know, there haven't been "autochtonous" people left in proper Toulousain (ie the right bank of the Garonne river) for 50 years. Even in tiny villages, people descend from Italian migrants that settled in the 20s or from "Gavach" people as they're called i.e. people from Massif Central (Aveyron, Lot, ...). And I doubt geneticists possess linguistic skills that could help them detect autochtonous surnames.<br /><br />Sampling the high valley of the Ariège river would be more interesting.Heraushttps://www.blogger.com/profile/07032921971763481466noreply@blogger.com